V. Savchuk, V. Prykhodchenko, Y. Dementieva, D. Prykhodchenko
Purpose. To establish the petrographic and chemical-technological features of the coal seams of formation C12 of the Kalmius block. Method. General scientific and applied research methods were used to fulfill the tasks. With the help of petrographic methods, the macroscopic and microscopic characteristics of the composition of coal were studied in detail, and the degree of its recovery and metamorphism was determined. With the help of chemical and technological methods, a comprehensive description of the composition and quality of coal is provided. The use of modern methods of analysis and interpretation made it possible to provide a generalized characteristic of coal seams, to reveal the peculiarities of their composition and quality. Findings. For the first time, regional ("provincial") features of the composition and quality of the coal formation C12 for Lower Donbass were revealed. Their typical petrographic composition was determined on the Kalmius block square. It was established that the coal of formation C12 differs from coal of formation C13 both in terms of gross petrographic composition and maceral composition. In addition, they are characterized by different degrees of recovery. It is proved that in the stratigraphic section, from the layers of the lower world to the layers of the upper world, the number of maceral groups of inertinite and liptinite increases, and the groups of vitrinite decrease. Lateral regularities of changes in the composition and quality of coal are determined. It was established that, compared to coal formation C13, higher values of sulfur content, heat of combustion, thickness of the plastic layer, and the Rog index are characteristic of coal formation C12. The elemental composition of the coal seams formation C12 is characterized by higher values of carbon and hydrogen content and significantly lower values of the amount of oxygen. Changes in the petrographic composition of Lower Carboniferous coal were revealed. The originality. For the first time, changes in the typical petrographic composition of coal in the Lower Carboniferous stratigraphic section of Southern Donbas, which indicate different conditions of formation of peatlands, were established. Practical implementation. The regional ("provincial") features of the region's coal have been clarified, lateral and stratigraphic changes in its composition and quality indicators have been determined, the grade composition of coal according to the new current standard in Ukraine has been established, and the technological value of formation C12 coal has been calculated.
{"title":"Petrographic and chemical-technological characteristics coal seamsof the lower carbon,formation C12 of the kalmiusblock","authors":"V. Savchuk, V. Prykhodchenko, Y. Dementieva, D. Prykhodchenko","doi":"10.33271/crpnmu/69.159","DOIUrl":"https://doi.org/10.33271/crpnmu/69.159","url":null,"abstract":"Purpose. To establish the petrographic and chemical-technological features of the coal seams of formation C12 of the Kalmius block. Method. General scientific and applied research methods were used to fulfill the tasks. With the help of petrographic methods, the macroscopic and microscopic characteristics of the composition of coal were studied in detail, and the degree of its recovery and metamorphism was determined. With the help of chemical and technological methods, a comprehensive description of the composition and quality of coal is provided. The use of modern methods of analysis and interpretation made it possible to provide a generalized characteristic of coal seams, to reveal the peculiarities of their composition and quality. Findings. For the first time, regional (\"provincial\") features of the composition and quality of the coal formation C12 for Lower Donbass were revealed. Their typical petrographic composition was determined on the Kalmius block square. It was established that the coal of formation C12 differs from coal of formation C13 both in terms of gross petrographic composition and maceral composition. In addition, they are characterized by different degrees of recovery. It is proved that in the stratigraphic section, from the layers of the lower world to the layers of the upper world, the number of maceral groups of inertinite and liptinite increases, and the groups of vitrinite decrease. Lateral regularities of changes in the composition and quality of coal are determined. It was established that, compared to coal formation C13, higher values of sulfur content, heat of combustion, thickness of the plastic layer, and the Rog index are characteristic of coal formation C12. The elemental composition of the coal seams formation C12 is characterized by higher values of carbon and hydrogen content and significantly lower values of the amount of oxygen. Changes in the petrographic composition of Lower Carboniferous coal were revealed. The originality. For the first time, changes in the typical petrographic composition of coal in the Lower Carboniferous stratigraphic section of Southern Donbas, which indicate different conditions of formation of peatlands, were established. Practical implementation. The regional (\"provincial\") features of the region's coal have been clarified, lateral and stratigraphic changes in its composition and quality indicators have been determined, the grade composition of coal according to the new current standard in Ukraine has been established, and the technological value of formation C12 coal has been calculated.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75831884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Ihnatov, B. Ratov, Ya. Tkachenko, S. Shypunov, S. Vetoshka
Purpose. Improving the technical and economic indicators and the degree of perfection of the process of constructive selection, justification and engineering calculation of effective schemes for the implementation of individual units of drill bits, ensuring the constancy of the process of deepening the bottom hole with high productivity and resource saving. Research methodology. Applied computational and laboratory studies of the design features of the design choice of drilling bits of new designs were carried out using modern methods of analytical analysis and experimental research, in particular, by using the general principles of mathematical and physical modeling, methods for processing research results in the EXCEL, MATHCAD environment, control and measurement systems and materials. The flow of borehole processes was modeled on experimental wells of the training drilling site of the Dnipro University of Technology using the UKB-4P drilling rig and the corresponding auxiliary tools and equipment. Research results. A critical review of research and development in the field of designing drill bits was carried out; special attention is paid to the schemes for the implementation and operation of weapons systems and analysis of the properties of materials used to manufacture individual parts of drill bit assemblies; highlights the main advantages and disadvantages of existing schemes for the execution of bits; factors of working capacity and durability of elements of bits are defined; the causes of bit wear are established and the provisions of the problem of improving the technique and technology for making drill bit assemblies are formulated. Originality. A constructive approach to the drilling bit execution system using advanced technology and the creation of a workable destructive assembly of the specified tool for well construction can be based on the principle of chain execution of the destructive body. Practical implications. Fundamentally new design schemes for the implementation of the working destructive unit of the drill bit have been created, the use of which will lead to a significant increase in the productivity of exploration and production work, a reduction in the time for auxiliary operations, and an overall increase in the efficiency and economy of the well construction process.
{"title":"Development of methodological and constructive foundations for drilling wells using new types of bits","authors":"A. Ihnatov, B. Ratov, Ya. Tkachenko, S. Shypunov, S. Vetoshka","doi":"10.33271/crpnmu/69.218","DOIUrl":"https://doi.org/10.33271/crpnmu/69.218","url":null,"abstract":"Purpose. Improving the technical and economic indicators and the degree of perfection of the process of constructive selection, justification and engineering calculation of effective schemes for the implementation of individual units of drill bits, ensuring the constancy of the process of deepening the bottom hole with high productivity and resource saving. Research methodology. Applied computational and laboratory studies of the design features of the design choice of drilling bits of new designs were carried out using modern methods of analytical analysis and experimental research, in particular, by using the general principles of mathematical and physical modeling, methods for processing research results in the EXCEL, MATHCAD environment, control and measurement systems and materials. The flow of borehole processes was modeled on experimental wells of the training drilling site of the Dnipro University of Technology using the UKB-4P drilling rig and the corresponding auxiliary tools and equipment. Research results. A critical review of research and development in the field of designing drill bits was carried out; special attention is paid to the schemes for the implementation and operation of weapons systems and analysis of the properties of materials used to manufacture individual parts of drill bit assemblies; highlights the main advantages and disadvantages of existing schemes for the execution of bits; factors of working capacity and durability of elements of bits are defined; the causes of bit wear are established and the provisions of the problem of improving the technique and technology for making drill bit assemblies are formulated. Originality. A constructive approach to the drilling bit execution system using advanced technology and the creation of a workable destructive assembly of the specified tool for well construction can be based on the principle of chain execution of the destructive body. Practical implications. Fundamentally new design schemes for the implementation of the working destructive unit of the drill bit have been created, the use of which will lead to a significant increase in the productivity of exploration and production work, a reduction in the time for auxiliary operations, and an overall increase in the efficiency and economy of the well construction process.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84148436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. Determination of rational parameters of the process of electrospark alloying of 40X steel parts with different types of electrodes. Measurement of the applied layer thickness using the Mora Primus 564 coordinate measuring machine at the customer's plant. To give recommendations on the use of electrospark alloying processing modes in the production process when restoring parts. Research methods are based on effective methods of treatment of metal surfaces and technology of obtaining modified layers by electrospark treatment. Measurements were based on theoretical metrology in modeling instrumental errors of measuring instruments, theoretical principles of instrumentation and mechanical engineering technology. The Mora Primus 564 coordinate measuring machine was used during the measurements. Research results. Electrospark alloying is one of the most common technologies for working with metal, which is characterized by high accuracy and productivity. In addition, high adhesion strength of the applied layer with the base material is provided, and the process itself is easy to perform technological operations and has low energy consumption. The analysis of the main factors influencing the quality of the surface layer during processing is carried out. The process of electrospark alloying of a 40X steel sample was investigated experimentally. During the experiments, modern control and measuring equipment and measurement methods were used. Scientific novelty. For the first time, rational modes of electrospark alloying with vanadium, titanium and tungsten of 40X steel parts have been determined. The dependence of the thickness of the applied layer on the modes of treatment with different electrode material is established. Recommendations for alloying modes in the production process for 40X steel are given. Practical meaning. The experimental researches on electrospark alloying of the 40X steel sample carried out in the production conditions allowed to reveal the basic regularities of the formation of the surface layer and to formulate recommendations for obtaining a coating of a certain thickness. This will restore the worn surface of the part or strengthen the new one.
目的。40X钢零件不同电极类型电火花合金化工艺合理参数的确定在客户工厂使用Mora Primus 564坐标测量机测量涂敷层厚度。在修复零件时，对生产过程中使用电火花合金化加工方式提出建议。研究方法是基于有效的金属表面处理方法和电火花处理获得改性层的技术。测量的基础是理论计量学对测量仪器的误差建模、仪器仪表的理论原理和机械工程技术。测量过程中使用Mora Primus 564坐标测量机。研究的结果。电火花合金化是金属加工中最常用的技术之一，具有精度高、生产率高的特点。此外，提供了涂敷层与基材的高附着力，工艺本身易于进行工艺操作，能耗低。分析了加工过程中影响表面层质量的主要因素。对40X钢试样的电火花合金化过程进行了实验研究。在实验过程中，采用了现代控制和测量设备和测量方法。科学的新奇。首次确定了40X钢零件钒、钛、钨电火花合金化的合理模式。建立了不同电极材料处理方式对外加层厚度的依赖性。对40X钢的合金化方式提出了建议。现实意义。在生产条件下对40X钢试样进行了电火花合金化实验研究，揭示了表面层形成的基本规律，提出了获得一定厚度镀层的建议。这将恢复零件磨损的表面或加强新的。
{"title":"Research of the regularities of the processes of formation of the surface layer in electric spark alloying","authors":"O. Bohdanov, V. Kozechko","doi":"10.33271/crpnmu/69.172","DOIUrl":"https://doi.org/10.33271/crpnmu/69.172","url":null,"abstract":"Purpose. Determination of rational parameters of the process of electrospark alloying of 40X steel parts with different types of electrodes. Measurement of the applied layer thickness using the Mora Primus 564 coordinate measuring machine at the customer's plant. To give recommendations on the use of electrospark alloying processing modes in the production process when restoring parts. Research methods are based on effective methods of treatment of metal surfaces and technology of obtaining modified layers by electrospark treatment. Measurements were based on theoretical metrology in modeling instrumental errors of measuring instruments, theoretical principles of instrumentation and mechanical engineering technology. The Mora Primus 564 coordinate measuring machine was used during the measurements. Research results. Electrospark alloying is one of the most common technologies for working with metal, which is characterized by high accuracy and productivity. In addition, high adhesion strength of the applied layer with the base material is provided, and the process itself is easy to perform technological operations and has low energy consumption. The analysis of the main factors influencing the quality of the surface layer during processing is carried out. The process of electrospark alloying of a 40X steel sample was investigated experimentally. During the experiments, modern control and measuring equipment and measurement methods were used. Scientific novelty. For the first time, rational modes of electrospark alloying with vanadium, titanium and tungsten of 40X steel parts have been determined. The dependence of the thickness of the applied layer on the modes of treatment with different electrode material is established. Recommendations for alloying modes in the production process for 40X steel are given. Practical meaning. The experimental researches on electrospark alloying of the 40X steel sample carried out in the production conditions allowed to reveal the basic regularities of the formation of the surface layer and to formulate recommendations for obtaining a coating of a certain thickness. This will restore the worn surface of the part or strengthen the new one.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91364657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ye.V. Semenenko, O. Medvedieva, V. Medianyk, A. Іvlev, B. Blyuss
Purpose. The method of determining the distance from the inner facelower edge of the embankment dam along the level of the wash to the point where particles of a given density and size will begin to fall from the flow to the dusting surface of the of washout, taking into account the flow rate and concentration of the water mixture, the slope of dusting surface of washout and the coefficient of friction of the soil from which it was formed in the article, for the conditions of collecting waste from mineral raw materials processing into artificial storages using hydraulic methods. Methodology. In contrast to existing methods, the approach used in the article provides for the upper limit determination of the particles concentration zone of a specific fraction, determined taking into account the critical flow regime, when the speed at which particles fall out of the flow is determined by the hydraulic particle size and the slope of the bottom surface flow. Results. The dependence of the relative upper limit of the slope during washing formation of the layer on the solid fraction parameters, the flow rate and the volumetric concentration of the water mixture coming from the pipeline was established. The dependence has a maximum, the parameters of which are determined by the density, diameter and friction coefficient of solid particles, as well as the value of the flow of the water mixture distributed along the length of the beachis shown. Scientific novelty. For the first time, the technique takes into account the influence on the material fractionation process of both particle density and their diameters. This makes it possible to calculate the occurrence of man-made deposits limits and predict the parameters and characteristics of man-made deposits formed in mineral raw material processing waste storages. Practical significance. For the first time it is possible to determine on the dusting surface of washout where the zones in which the particles of only one fraction are concentrated intersect, though it is possible to calculate the areas with a combined concentration of several fractions particles with the help of the formulas given in the article.
{"title":"Justification of the upper limit of slope formation when washing the tail storage tiers","authors":"Ye.V. Semenenko, O. Medvedieva, V. Medianyk, A. Іvlev, B. Blyuss","doi":"10.33271/crpnmu/69.058","DOIUrl":"https://doi.org/10.33271/crpnmu/69.058","url":null,"abstract":"Purpose. The method of determining the distance from the inner facelower edge of the embankment dam along the level of the wash to the point where particles of a given density and size will begin to fall from the flow to the dusting surface of the of washout, taking into account the flow rate and concentration of the water mixture, the slope of dusting surface of washout and the coefficient of friction of the soil from which it was formed in the article, for the conditions of collecting waste from mineral raw materials processing into artificial storages using hydraulic methods. Methodology. In contrast to existing methods, the approach used in the article provides for the upper limit determination of the particles concentration zone of a specific fraction, determined taking into account the critical flow regime, when the speed at which particles fall out of the flow is determined by the hydraulic particle size and the slope of the bottom surface flow. Results. The dependence of the relative upper limit of the slope during washing formation of the layer on the solid fraction parameters, the flow rate and the volumetric concentration of the water mixture coming from the pipeline was established. The dependence has a maximum, the parameters of which are determined by the density, diameter and friction coefficient of solid particles, as well as the value of the flow of the water mixture distributed along the length of the beachis shown. Scientific novelty. For the first time, the technique takes into account the influence on the material fractionation process of both particle density and their diameters. This makes it possible to calculate the occurrence of man-made deposits limits and predict the parameters and characteristics of man-made deposits formed in mineral raw material processing waste storages. Practical significance. For the first time it is possible to determine on the dusting surface of washout where the zones in which the particles of only one fraction are concentrated intersect, though it is possible to calculate the areas with a combined concentration of several fractions particles with the help of the formulas given in the article.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91470293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. To propose a new approach to the treatment of coal mine wastes with sodium-based suspensions, thereby preserving the ecology of coal mining regions. Methodology. To solve these problems we applied methods of literature analysis, mathematical sta-tistics, method of ecological assessment of alternative technological solutions for the use of suspensions for the treatment of coal mining wastes. Findings. For the first time the use of sodium soda solution group: sodium carbonate, sodium hydro-gen carbonate and sodium hydroxide for treatment of waste mass is proposed. On the basis of the carried out researches interaction of the specified samples of the waste mass is revealed, taking into account influence of environment. Suggestions of soda solutions of sodium group treatment of waste mass, on the basis of which preservation of ecological stability of mining regions is achieved, are offered. Originality. The analysis of efficiency indicators of technological solutions for treatment of waste coal tailings by inhibitors on the basis of suspensions allowed to develop recommendations for use of sodium group suspensions in the treatment of tailings at the initial stage of formation of waste coal, which will ensure the environmental stability of mining regions. As a result of the study, a new technique of waste rock treatment with solutions of sodium group, which levels the influence of the environment on the chemical processes in the interstitial space of the waste rock of coal-mining is pro-posed. Practical implications. The suggested technique of treatment with suspensions on the basis of sodium group can be applied for the complex treatment of waste mass which will allow to prevent occurrence of ecological risks of pollution of mining regions, and also to predict the level of influence of environment on the waste mass treated with sodium solutions of factor of development of processes of self-ignition of coal-mining wastes.
{"title":"Study of sodium-group solution treatment of burning coal mining wastes for interaction with the environment","authors":"I. Chobotko","doi":"10.33271/crpnmu/69.112","DOIUrl":"https://doi.org/10.33271/crpnmu/69.112","url":null,"abstract":"Purpose. To propose a new approach to the treatment of coal mine wastes with sodium-based suspensions, thereby preserving the ecology of coal mining regions. Methodology. To solve these problems we applied methods of literature analysis, mathematical sta-tistics, method of ecological assessment of alternative technological solutions for the use of suspensions for the treatment of coal mining wastes. Findings. For the first time the use of sodium soda solution group: sodium carbonate, sodium hydro-gen carbonate and sodium hydroxide for treatment of waste mass is proposed. On the basis of the carried out researches interaction of the specified samples of the waste mass is revealed, taking into account influence of environment. Suggestions of soda solutions of sodium group treatment of waste mass, on the basis of which preservation of ecological stability of mining regions is achieved, are offered. Originality. The analysis of efficiency indicators of technological solutions for treatment of waste coal tailings by inhibitors on the basis of suspensions allowed to develop recommendations for use of sodium group suspensions in the treatment of tailings at the initial stage of formation of waste coal, which will ensure the environmental stability of mining regions. As a result of the study, a new technique of waste rock treatment with solutions of sodium group, which levels the influence of the environment on the chemical processes in the interstitial space of the waste rock of coal-mining is pro-posed. Practical implications. The suggested technique of treatment with suspensions on the basis of sodium group can be applied for the complex treatment of waste mass which will allow to prevent occurrence of ecological risks of pollution of mining regions, and also to predict the level of influence of environment on the waste mass treated with sodium solutions of factor of development of processes of self-ignition of coal-mining wastes.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73389517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. Establish an effective direction of the mining front direction in the beams locations at the development of a placer mineral deposit. Research methodology. The analytical method of research was used at the development of a method for determining the time of mining a pit section with a crossed beam surface when applying schemes with longitudinal and transverse movement of the mining front. The graphical method was used to analyze the established dependences of the maximum allowable cutwidth into the rock mass on the length of the open pit when determining the effective scope of the scheme with the longitudinal direction of the mining front at the development of placer deposits. The results. Schemes for mining a pit section with a cross-beam surface have been developed, providing for the longitudinal and transverse direction of the mining front, which make it possible to determine the main parameters of the mining system elements and establish the term of pit life. Efficient parameters have been established for the use of the transverse and longitudinal directions of mining faces movement when a pitsection with rugged terrain, which makes it possible to reduce the labor intensity of the process by 150–220 machine-shifts of an excavator at the pit field length of 300 to 900 m. Scientific novelty. The influence of the open pit length on the maximum allowable cut width into the rock mass during the longitudinal movement of the mining front is determined. The results of the research allow to establish that with an increase in the open pit length from 300 to 900 m, the maximum allowable width of the cut into the rock mass during the longitudinal movement of the front increases from 140 to 740 m. Practical value. A method for determining the time of mining a pit section with a crossed beam surface when using schemes with longitudinal and transverse movement of the mining front has been developed. The use of the proposed method makes it possible to determine the effective direction of mining front movement, depending on the parameters of the development system pit elements.
{"title":"Determining the direction of the mining face direction during development of ravines pit surface","authors":"B. Sobko, O. Lozhnikov","doi":"10.33271/crpnmu/69.083","DOIUrl":"https://doi.org/10.33271/crpnmu/69.083","url":null,"abstract":"Purpose. Establish an effective direction of the mining front direction in the beams locations at the development of a placer mineral deposit. Research methodology. The analytical method of research was used at the development of a method for determining the time of mining a pit section with a crossed beam surface when applying schemes with longitudinal and transverse movement of the mining front. The graphical method was used to analyze the established dependences of the maximum allowable cutwidth into the rock mass on the length of the open pit when determining the effective scope of the scheme with the longitudinal direction of the mining front at the development of placer deposits. The results. Schemes for mining a pit section with a cross-beam surface have been developed, providing for the longitudinal and transverse direction of the mining front, which make it possible to determine the main parameters of the mining system elements and establish the term of pit life. Efficient parameters have been established for the use of the transverse and longitudinal directions of mining faces movement when a pitsection with rugged terrain, which makes it possible to reduce the labor intensity of the process by 150–220 machine-shifts of an excavator at the pit field length of 300 to 900 m. Scientific novelty. The influence of the open pit length on the maximum allowable cut width into the rock mass during the longitudinal movement of the mining front is determined. The results of the research allow to establish that with an increase in the open pit length from 300 to 900 m, the maximum allowable width of the cut into the rock mass during the longitudinal movement of the front increases from 140 to 740 m. Practical value. A method for determining the time of mining a pit section with a crossed beam surface when using schemes with longitudinal and transverse movement of the mining front has been developed. The use of the proposed method makes it possible to determine the effective direction of mining front movement, depending on the parameters of the development system pit elements.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78522443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
O. Inkin, N. Dereviahina, P. Volk, Yuliia Hriplivec
The purpose of the article is development and testing of a mathematical model of gas storage in a layered aquifer with a low permeabilityinterlayer for a case of plane-parallel and axial-symmetric filtration. Methodology. One of the most common models of anisotropy of rocks is a model of a layered seam, which is explained by geological conditions of sedimentation, which lead to stratification of layers with different collecting properties. In the practice of underground gas storage, consideration of such a model is of particular importance.This is due to possible significant difference in advancing a boundary of gas-water contact through the interlayers with different filtration characteristics caused by changes in a position of a gas zone. A comprehensive approach is applied, which includes collection, systematization and analysis of actual data on filtration and physical and mechanical properties of host rocks that affect the formation of natural and technogenic deposits, as well as analytical and numerical methods for solving equations of gas-water contact in different conditions. Results. Gas-hydrodynamic model of underground gas storage in an inhomogeneous aquifer is justified for calculation of its cyclic operation in a three-layer seam considering cross-flows through a low permeability interlayer.The results can be used in evaluation calculations at a design stage of gas storage facilities in aquifers. Scientific novelty. A mathematical model of gas storage in a layered aquifer with a low permeability interlayerfor a case of plane-parallel and axial-symmetric filtration is developed and tested. A new method of linearization of a system of differential equations for determining pressures in a collectingseamis obtained in the article and it is a generalization of previously used methods, with an introduction of "boundary schemes". Practical significance. Calculation results indicate a significant influence of characteristics of a layered porous medium on the advance of gas-water contact along individual layers. The results can be used in the evaluation calculations at a design stage of gas storage facilities in aquifers.
{"title":"Estimation of parameters of gas storage operation in inhomogeneous aquifers","authors":"O. Inkin, N. Dereviahina, P. Volk, Yuliia Hriplivec","doi":"10.33271/crpnmu/69.023","DOIUrl":"https://doi.org/10.33271/crpnmu/69.023","url":null,"abstract":"The purpose of the article is development and testing of a mathematical model of gas storage in a layered aquifer with a low permeabilityinterlayer for a case of plane-parallel and axial-symmetric filtration. Methodology. One of the most common models of anisotropy of rocks is a model of a layered seam, which is explained by geological conditions of sedimentation, which lead to stratification of layers with different collecting properties. In the practice of underground gas storage, consideration of such a model is of particular importance.This is due to possible significant difference in advancing a boundary of gas-water contact through the interlayers with different filtration characteristics caused by changes in a position of a gas zone. A comprehensive approach is applied, which includes collection, systematization and analysis of actual data on filtration and physical and mechanical properties of host rocks that affect the formation of natural and technogenic deposits, as well as analytical and numerical methods for solving equations of gas-water contact in different conditions. Results. Gas-hydrodynamic model of underground gas storage in an inhomogeneous aquifer is justified for calculation of its cyclic operation in a three-layer seam considering cross-flows through a low permeability interlayer.The results can be used in evaluation calculations at a design stage of gas storage facilities in aquifers. Scientific novelty. A mathematical model of gas storage in a layered aquifer with a low permeability interlayerfor a case of plane-parallel and axial-symmetric filtration is developed and tested. A new method of linearization of a system of differential equations for determining pressures in a collectingseamis obtained in the article and it is a generalization of previously used methods, with an introduction of \"boundary schemes\". Practical significance. Calculation results indicate a significant influence of characteristics of a layered porous medium on the advance of gas-water contact along individual layers. The results can be used in the evaluation calculations at a design stage of gas storage facilities in aquifers.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88752733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Bublikov, V. Shevchenko, V. Nadtochyy, D. Yatsyuk
Purpose. To increase the productivity of the cutter-loader by creating a modified algorithm for automatic control of its speed with correction of stable power of cutting drive motors based on the results of statistical analysis of power during operation of the cutter-loader. Research methodology. As a research tool, a complex simulation model of the cutter-loader’scontrol system is used, which includes well-known mathematical models, describing the mining and geological properties of coal seams, as well as processes occurring in the structural elements of the cutter-loader. With the help of calculational experiments, the regularities of changes of statistical estimates of the power of the cutting drive engine for different mining and geological properties of the coal seam and the dynamics of the cutter-loader are established. The analysis of these regularities allowed to establish the dependence of the stable power of the cutting drive motor on the mining and geological parameters of the formation, and on their basis to propose a method of correction of the stable power during the working of the cutter-loader. A study of the effectiveness of the algorithm for automatic control of the speed of the cutter-loader using the proposed method in comparison with the existing algorithm. Research results. It is established, that the steady power of the cutting drive motor, corrected taking into account the standard deviation of the high-frequency component of the cutting drive motor power on a short section of the array, has a clearly determined deterministic component, which is determined by the change of resistance of coal to cutting along the coal seam. Also, steady power has a random component with the weight 15%, which is associated with the unpredictable oscillating nature of the movement of the cutter-loader, and with the complex and random nature of the process of destruction of the coal seam by the executive body. It is determined, that the double value of the standard deviation of the high-frequency power component of the cutting drive motor, as a power reserve, provides the percentage of exceeding by instantaneous power of allowable value, which is as close as possible to its acceptable level without exceeding it. Scientific novelty. For the first time, the dependence of the percentage of instantaneous power, exceeding its allowable value, on the coefficient of proportionality between the power margin and the standard deviation of the high-frequency power component under the condition of calculating the steady power of the cutting drive motor. This allowed us to determine the coefficient of proportionality, at which the percentage of cases of exceeding the instantaneous power of its permissible value is as close as possible to its acceptable level, but without exceeding it. Practical meaning. The method of correcting the stable power of the cutting drive motor during the operation of the cutter-loader is proposed. At the same time, the parameter
{"title":"Modified algorithm for automatic control of the mining harvester according to the load of the engine of the cutting drive","authors":"A. Bublikov, V. Shevchenko, V. Nadtochyy, D. Yatsyuk","doi":"10.33271/crpnmu/69.179","DOIUrl":"https://doi.org/10.33271/crpnmu/69.179","url":null,"abstract":"Purpose. To increase the productivity of the cutter-loader by creating a modified algorithm for automatic control of its speed with correction of stable power of cutting drive motors based on the results of statistical analysis of power during operation of the cutter-loader. Research methodology. As a research tool, a complex simulation model of the cutter-loader’scontrol system is used, which includes well-known mathematical models, describing the mining and geological properties of coal seams, as well as processes occurring in the structural elements of the cutter-loader. With the help of calculational experiments, the regularities of changes of statistical estimates of the power of the cutting drive engine for different mining and geological properties of the coal seam and the dynamics of the cutter-loader are established. The analysis of these regularities allowed to establish the dependence of the stable power of the cutting drive motor on the mining and geological parameters of the formation, and on their basis to propose a method of correction of the stable power during the working of the cutter-loader. A study of the effectiveness of the algorithm for automatic control of the speed of the cutter-loader using the proposed method in comparison with the existing algorithm. Research results. It is established, that the steady power of the cutting drive motor, corrected taking into account the standard deviation of the high-frequency component of the cutting drive motor power on a short section of the array, has a clearly determined deterministic component, which is determined by the change of resistance of coal to cutting along the coal seam. Also, steady power has a random component with the weight 15%, which is associated with the unpredictable oscillating nature of the movement of the cutter-loader, and with the complex and random nature of the process of destruction of the coal seam by the executive body. It is determined, that the double value of the standard deviation of the high-frequency power component of the cutting drive motor, as a power reserve, provides the percentage of exceeding by instantaneous power of allowable value, which is as close as possible to its acceptable level without exceeding it. Scientific novelty. For the first time, the dependence of the percentage of instantaneous power, exceeding its allowable value, on the coefficient of proportionality between the power margin and the standard deviation of the high-frequency power component under the condition of calculating the steady power of the cutting drive motor. This allowed us to determine the coefficient of proportionality, at which the percentage of cases of exceeding the instantaneous power of its permissible value is as close as possible to its acceptable level, but without exceeding it. Practical meaning. The method of correcting the stable power of the cutting drive motor during the operation of the cutter-loader is proposed. At the same time, the parameter","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91368498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. Highlight the main results of the experiments performed on the destruction of martite ores by the method of borehole hydraulic destruction by their layering. Since, as a result of the analysis of literary sources, it was established that some of the deposits of the Kryvyi Rihiron ore basin are suitable for hydro monitor excavation.Consideration of the method of introducing technologies for hydromechanization of mining operations in the conditions of the Kryvyi Rihiron ore basin is a topical issue. The methods. Using experimental installations conduct experiments on the destruction of layers of martite ores, gradually increasing the water pressure and determine the qualitative fractional yield of raw materials. Mathematical processing of the results obtained and the construction of dependencies based on experiments. Findings. Showing of the sequence of the experiment, the creation of summary tables with the results and the construction of illustrated graphs is the result of a study of determining the yield of fractional material during the destruction of ores by water jets. The originality. Experiments have shown that the yield of the ore fraction during their destruction using the hydro fracture method depends both on the water pressure and on the stratification of the ores. Ores that break down along the layer are more prone to overgrinding, and ores that break into a cross are less likely to. Therefore, the output of fractions during the destruction of layers of martite ores in some values can be controlled. Practical implementation. The development of floodingdeposits of rich iron ores by classical, unsuitable methods is accompanied by a large number of losses of ore raw materials or the impossibility of developing the deposit, because an alternative to the classical drilling and blasting method of destruction of a massif of rock is proposed technology of hydromechanization.The use of borehole hydraulic mining technology will allow the use of water flows from drainage wells or a sump for the safe, non-explosive destruction of the massif. This will increase the safety of mining operations, as well as reduce the seismic impact on the workings before the start of stope extraction.
{"title":"Determination of yield of fractional material bydestruction of martiteore by water jets depending on the direction of their cutting","authors":"K. Kovbyk","doi":"10.33271/crpnmu/69.035","DOIUrl":"https://doi.org/10.33271/crpnmu/69.035","url":null,"abstract":"Purpose. Highlight the main results of the experiments performed on the destruction of martite ores by the method of borehole hydraulic destruction by their layering. Since, as a result of the analysis of literary sources, it was established that some of the deposits of the Kryvyi Rihiron ore basin are suitable for hydro monitor excavation.Consideration of the method of introducing technologies for hydromechanization of mining operations in the conditions of the Kryvyi Rihiron ore basin is a topical issue. The methods. Using experimental installations conduct experiments on the destruction of layers of martite ores, gradually increasing the water pressure and determine the qualitative fractional yield of raw materials. Mathematical processing of the results obtained and the construction of dependencies based on experiments. Findings. Showing of the sequence of the experiment, the creation of summary tables with the results and the construction of illustrated graphs is the result of a study of determining the yield of fractional material during the destruction of ores by water jets. The originality. Experiments have shown that the yield of the ore fraction during their destruction using the hydro fracture method depends both on the water pressure and on the stratification of the ores. Ores that break down along the layer are more prone to overgrinding, and ores that break into a cross are less likely to. Therefore, the output of fractions during the destruction of layers of martite ores in some values can be controlled. Practical implementation. The development of floodingdeposits of rich iron ores by classical, unsuitable methods is accompanied by a large number of losses of ore raw materials or the impossibility of developing the deposit, because an alternative to the classical drilling and blasting method of destruction of a massif of rock is proposed technology of hydromechanization.The use of borehole hydraulic mining technology will allow the use of water flows from drainage wells or a sump for the safe, non-explosive destruction of the massif. This will increase the safety of mining operations, as well as reduce the seismic impact on the workings before the start of stope extraction.","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90359486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. Development of CFD model and computer code for the analysis and forecasting of the process of formation of areas of chemical contamination in the workplace in the event of an emergency leak of a hazardous substance, allowing to take into account the influence of obstacles and the operation of the ventilation system on this process. The methods. The masstransfer equation is used to calculate the process of formation of areas of chemical contamination in the workplace over time. Navier-Stokes equations are used to solve the problem of aerodynamics – determination of the air flow velocity field in the room. For the numerical solution of modeling equations, finite-difference splitting schemes are used. On the basis of the developed numerical model, a computer code was created for conducting computational experiments Findings. An effective CFD model and computer code were created, which allow to quickly analyze the level of chemical pollution of working areas in possible emergency situations accompanied by the emission of dangerous substances. The results of the computational experiment are presented. The originality. An effective CFD model has been developed, which allows to calculate the dynamics of the formation of areas of chemical air pollution in the workplace in the event of an emergency leak of a chemically hazardous substance Practical implementation. On the basis of the proposed CFD model, a computer code has been developed that allows determining the dynamics of the formation of areas of contamination in the workplace during the emergency emission of hazardous substances. The model can be used to analyze the risk of toxic damage to personnel in the workplace
{"title":"Mathematical modeling of air pollution in working room","authors":"M. Biliaiev, O. Berlov, V. Kozachyna, V. Tsurkan","doi":"10.33271/crpnmu/69.254","DOIUrl":"https://doi.org/10.33271/crpnmu/69.254","url":null,"abstract":"Purpose. Development of CFD model and computer code for the analysis and forecasting of the process of formation of areas of chemical contamination in the workplace in the event of an emergency leak of a hazardous substance, allowing to take into account the influence of obstacles and the operation of the ventilation system on this process. The methods. The masstransfer equation is used to calculate the process of formation of areas of chemical contamination in the workplace over time. Navier-Stokes equations are used to solve the problem of aerodynamics – determination of the air flow velocity field in the room. For the numerical solution of modeling equations, finite-difference splitting schemes are used. On the basis of the developed numerical model, a computer code was created for conducting computational experiments Findings. An effective CFD model and computer code were created, which allow to quickly analyze the level of chemical pollution of working areas in possible emergency situations accompanied by the emission of dangerous substances. The results of the computational experiment are presented. The originality. An effective CFD model has been developed, which allows to calculate the dynamics of the formation of areas of chemical air pollution in the workplace in the event of an emergency leak of a chemically hazardous substance Practical implementation. On the basis of the proposed CFD model, a computer code has been developed that allows determining the dynamics of the formation of areas of contamination in the workplace during the emergency emission of hazardous substances. The model can be used to analyze the risk of toxic damage to personnel in the workplace","PeriodicalId":10466,"journal":{"name":"Collection of Research Papers of the National Mining University","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80609105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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