Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2019-2-75-84
O. Zemlianskyi, T. Kostenko, S. Kutsenko, O. Kostyrka, Anastasiya Kutselap
{"title":"RATIONALE APPROACH FOR DETERMINING THE CRITICAL SIGNIFICANCE OF THE LIQUID IN OIL AND OIL PRODUCTS TANKS ON THE BASIS OF TECHNOLOGICAL PROCESS FEATURES","authors":"O. Zemlianskyi, T. Kostenko, S. Kutsenko, O. Kostyrka, Anastasiya Kutselap","doi":"10.31474/1999-981x-2019-2-75-84","DOIUrl":"https://doi.org/10.31474/1999-981x-2019-2-75-84","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121897360","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2019-1-58-65
A. Merzlikin, V. Nazimko
{"title":"IMPROVEMENT OF MODELING AND FORECASTING OF RISKS OF UNDERGROUND MINING","authors":"A. Merzlikin, V. Nazimko","doi":"10.31474/1999-981x-2019-1-58-65","DOIUrl":"https://doi.org/10.31474/1999-981x-2019-1-58-65","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125948183","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2021-2-15-25
V. Bondarenko, O. Filonenko, M. Petlovanyi, V. Ruskykh
Purpose. Experimental studies of the interaction of blast-furnace and steel-making slags with open pit waters during their direct contact and assessment of the volume of filling of the formed man-made cavities during mining of mineral deposits. Methods. Based on the analysis, the current low level of metallurgical slag and the lack of real and effective directions of their large-scale utilization were determined. The laboratory studies of the interaction of metallurgical slags with open pit water at a certain time of interaction, generally accepted methods for studying the chemical composition and concentration of substances in water, computer-aided design software packages and drawings to determine the volumes of the open pit mined-out area were used. Results. The dynamics of changes in the products of interactions of steel-smelting slags with open-pit waters at a certain ratio and period of interaction was investigated. It was found that the concentration of pollutants upon contact of water with steel-making slag changes according to polynomial dependences on the time of their interaction, decreasing by the 30th day, which eliminates the danger for the aquifer. The safest type of metallurgical slag was recommended for the formation of the bottom layer of the backfill massif. The volumes of the mined-out area of the open pit were determined in detail to assess the volumes of placement of the backfill material based on metallurgical slags. Scientific novelty. The safety of the contact of backfill materials based on steelmaking slags with open pit water was scientifically proven, which is confirmed by the established polynomial patterns of changes in concentrations and pollutants from the ratio and time of interaction. Practical significance. The formation of the backfill massif on the basis of blast-furnace dump and steel-smelting slags will allow achieving an environmental effect, such as their safe disposal as a reclamation of technologically disturbed lands by mining and restoration of the economic value of the land plot, as well as preventing the formation of new dumps.
{"title":"JUSTIFICATION OF THE USE OF METALLURGICAL SLAGS AS A BACKFILL MATERIAL FOR QUARRY CAVITIES","authors":"V. Bondarenko, O. Filonenko, M. Petlovanyi, V. Ruskykh","doi":"10.31474/1999-981x-2021-2-15-25","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-2-15-25","url":null,"abstract":"Purpose. Experimental studies of the interaction of blast-furnace and steel-making slags with open pit waters during their direct contact and assessment of the volume of filling of the formed man-made cavities during mining of mineral deposits. Methods. Based on the analysis, the current low level of metallurgical slag and the lack of real and effective directions of their large-scale utilization were determined. The laboratory studies of the interaction of metallurgical slags with open pit water at a certain time of interaction, generally accepted methods for studying the chemical composition and concentration of substances in water, computer-aided design software packages and drawings to determine the volumes of the open pit mined-out area were used. Results. The dynamics of changes in the products of interactions of steel-smelting slags with open-pit waters at a certain ratio and period of interaction was investigated. It was found that the concentration of pollutants upon contact of water with steel-making slag changes according to polynomial dependences on the time of their interaction, decreasing by the 30th day, which eliminates the danger for the aquifer. The safest type of metallurgical slag was recommended for the formation of the bottom layer of the backfill massif. The volumes of the mined-out area of the open pit were determined in detail to assess the volumes of placement of the backfill material based on metallurgical slags. Scientific novelty. The safety of the contact of backfill materials based on steelmaking slags with open pit water was scientifically proven, which is confirmed by the established polynomial patterns of changes in concentrations and pollutants from the ratio and time of interaction. Practical significance. The formation of the backfill massif on the basis of blast-furnace dump and steel-smelting slags will allow achieving an environmental effect, such as their safe disposal as a reclamation of technologically disturbed lands by mining and restoration of the economic value of the land plot, as well as preventing the formation of new dumps.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"237 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120869896","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981X-2019-1-34-40
А. Molodetskyy, О. Gladkaya, V. Slyusarev
{"title":"THE ESTABLISHMENT OF DYNAMIC PARAMETERS OF THE ZONE OF LIMIT STATE OF COAL-ROCK MASSIF","authors":"А. Molodetskyy, О. Gladkaya, V. Slyusarev","doi":"10.31474/1999-981X-2019-1-34-40","DOIUrl":"https://doi.org/10.31474/1999-981X-2019-1-34-40","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126649454","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2021-1-135-142
I. Uriadnikova, V. Zaplatynskyi
Purpose: scientific substantiation of social security based on the principles of management of complex systems and an example of the application of mathematical modeling to determine internal risks in a complex social system.. Methods: use of elements of mathematical modeling, in particular the theory of optimal control and linear programming; analysis of the content of the concept of “security paradox”, logical-determinant assessment of this concept. Results: it is proposed to apply the principles of management of complex systems to ensure the social security of groups of people and society. An example of the application of mathematical modeling to determine internal risks in a complex social system is given. In order to ensure the proper functioning of risk mitigation measures in complex social systems, it is proposed to introduce compensatory risks, which may be penalties or other measures that can be considered as specifically introduced risks for individuals. The introduction of external protection against a number of dangers can provoke the emergence of a “security paradox”, the essence of which is to reduce the personal activity of counteracting risk by relying on external protection. Effective social security requires the development of a culture of security, morality, worldview and legislative measures.. Scientific novelty: the use of elements of mathematical modeling for risk assessment in the social security management system is proposed; introduced the concept of “security paradox”, which arises when security is moved from the individual to the collective level. The use of principles of management of complex systems for social security is offered. Practical significance: The use of a systematic approach and principles of management of complex systems in ensuring the security of society will identify the most important risks and focus on their prevention, prevention or reduction. An example of mathematical modeling is proposed to assess the internal risks of the social system.
{"title":"MANAGEMENT OF COMPLEX SOCIAL HUMAN SECURITY SYSTEMS","authors":"I. Uriadnikova, V. Zaplatynskyi","doi":"10.31474/1999-981x-2021-1-135-142","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-1-135-142","url":null,"abstract":"Purpose: scientific substantiation of social security based on the principles of management of complex systems and an example of the application of mathematical modeling to determine internal risks in a complex social system.. Methods: use of elements of mathematical modeling, in particular the theory of optimal control and linear programming; analysis of the content of the concept of “security paradox”, logical-determinant assessment of this concept. Results: it is proposed to apply the principles of management of complex systems to ensure the social security of groups of people and society. An example of the application of mathematical modeling to determine internal risks in a complex social system is given. In order to ensure the proper functioning of risk mitigation measures in complex social systems, it is proposed to introduce compensatory risks, which may be penalties or other measures that can be considered as specifically introduced risks for individuals. The introduction of external protection against a number of dangers can provoke the emergence of a “security paradox”, the essence of which is to reduce the personal activity of counteracting risk by relying on external protection. Effective social security requires the development of a culture of security, morality, worldview and legislative measures.. Scientific novelty: the use of elements of mathematical modeling for risk assessment in the social security management system is proposed; introduced the concept of “security paradox”, which arises when security is moved from the individual to the collective level. The use of principles of management of complex systems for social security is offered. Practical significance: The use of a systematic approach and principles of management of complex systems in ensuring the security of society will identify the most important risks and focus on their prevention, prevention or reduction. An example of mathematical modeling is proposed to assess the internal risks of the social system.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"461 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116183969","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2021-2-85-95
Y. Rudniev, M. Antoshchenko, E. Filatieva, J. Romanchenko
Purpose: to establish a possible correspondence between metamorphic processes with artificial thermal destruction of coals and their ashing in order to identify the components of mineral impurities that can affect the manifestation of the hazardous properties of coal mine seams. Methodology is based on a comparison of metamorphic processes that took place at a certain temperature mode in the bowels of the Earth and the production of artificial coals and their ashing. Results: The research made it possible to reveal the important role of mineral impurities in the formation of the hazardous properties of coal seams. This is due to both the significant possible content of mineral impurities in fossil coals, and the simultaneous presence of the main components that determine the hazardous properties of coal seams (carbon, hydrogen, sulfur, oxygen and moisture), both in the organic and in the mineral parts of fossil coals. To improve the regulatory framework for the safe conduct of mining operations, it is necessary to take into account features of the properties of fossil coals due to the presence of mineral impurities in them. In modern regulatory documents on the safe conduct of mining operations, in general, several indicators are used without proper scientific justification: the mass yield of volatiles during the thermal decomposition of coal, the volumetric yield of volatile substances, the thickness of the plastic layer and the logarithm of the electrical resistivity of anthracites. Their values are related to the dry ash-free mass of organic matter only. This excludes consideration of the influence of mineral impurities on the manifestation of the hazardous properties of coal mine seams during mining operations. In many cases, the content of moisture and sulfur is a criterion for the manifestation of hazardous properties of coal seams. They belong to the integral components of both organic and mineral constituents of fossil coals. The share of mineral impurities in the coals of individual coal seams can be more than 40%. The presence of oxygen, hydrogen, sulfur and moisture in mineral impurities significantly affects the manifestation of the hazardous properties of coal seams during mining. The content of mineral impurities in fossil coals in engineering calculations can be determined on the basis of the ash content of coals according to known empirical relationships, corrected for the content of total sulfur and, in some cases, carbon dioxide. Scientific novelty: the significant influence of mineral impurities in fossil coals on the manifestation of hazardous properties of coal seams during mining operations has been proved. Practical value: the results obtained allow substantiating the methodology for the combined use of the composition of organic and mineral components of fossil coals for a reliable forecast of the manifestation of hazardous properties of coal seams and improving the regulatory framework for their safe mining.
{"title":"ON THE INFLUENCE OF MINERAL IMPURITIES ON THE MANIFESTATION OF DANGEROUS PROPERTIES OF COAL SEAMS","authors":"Y. Rudniev, M. Antoshchenko, E. Filatieva, J. Romanchenko","doi":"10.31474/1999-981x-2021-2-85-95","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-2-85-95","url":null,"abstract":"Purpose: to establish a possible correspondence between metamorphic processes with artificial thermal destruction of coals and their ashing in order to identify the components of mineral impurities that can affect the manifestation of the hazardous properties of coal mine seams. Methodology is based on a comparison of metamorphic processes that took place at a certain temperature mode in the bowels of the Earth and the production of artificial coals and their ashing. Results: The research made it possible to reveal the important role of mineral impurities in the formation of the hazardous properties of coal seams. This is due to both the significant possible content of mineral impurities in fossil coals, and the simultaneous presence of the main components that determine the hazardous properties of coal seams (carbon, hydrogen, sulfur, oxygen and moisture), both in the organic and in the mineral parts of fossil coals. To improve the regulatory framework for the safe conduct of mining operations, it is necessary to take into account features of the properties of fossil coals due to the presence of mineral impurities in them. In modern regulatory documents on the safe conduct of mining operations, in general, several indicators are used without proper scientific justification: the mass yield of volatiles during the thermal decomposition of coal, the volumetric yield of volatile substances, the thickness of the plastic layer and the logarithm of the electrical resistivity of anthracites. Their values are related to the dry ash-free mass of organic matter only. This excludes consideration of the influence of mineral impurities on the manifestation of the hazardous properties of coal mine seams during mining operations. In many cases, the content of moisture and sulfur is a criterion for the manifestation of hazardous properties of coal seams. They belong to the integral components of both organic and mineral constituents of fossil coals. The share of mineral impurities in the coals of individual coal seams can be more than 40%. The presence of oxygen, hydrogen, sulfur and moisture in mineral impurities significantly affects the manifestation of the hazardous properties of coal seams during mining. The content of mineral impurities in fossil coals in engineering calculations can be determined on the basis of the ash content of coals according to known empirical relationships, corrected for the content of total sulfur and, in some cases, carbon dioxide. Scientific novelty: the significant influence of mineral impurities in fossil coals on the manifestation of hazardous properties of coal seams during mining operations has been proved. Practical value: the results obtained allow substantiating the methodology for the combined use of the composition of organic and mineral components of fossil coals for a reliable forecast of the manifestation of hazardous properties of coal seams and improving the regulatory framework for their safe mining.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126217176","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2019-2-51-57
V. Kushnarenko, Volodymyr Svyatnyy
{"title":"MODELLE UND SIMULATIONSMODELLE DER LUFTDYNAMIK VON GRUBENBEWETTERUNGSNETZEN ALS OBJEKTEN MIT VERTEILTEN PARAMETERN","authors":"V. Kushnarenko, Volodymyr Svyatnyy","doi":"10.31474/1999-981x-2019-2-51-57","DOIUrl":"https://doi.org/10.31474/1999-981x-2019-2-51-57","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128147312","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2021-2-68-77
I. Chobotko
Purpose. Investigation of the choice of parameters of equipment for extinguishing coal mining wastes that go to the formation of waste dumps, the choice of the main components of equipment for the operation of technological units and a schematic diagram of equipment for extinguishing coal mining wastes are proposed. Methods. Analysis of existing approaches to technological solutions to prevent combustion of waste dumps; environmental assessment of alternative options for technological solutions to prevent combustion of waste dumps; creation of an environmentally friendly design technology for the use of coal mining waste. Results. Based on in-depth analysis of the main components of technological units for the operation of the equipment, MFP FullJet irrigation nozzles by Spraying Systems Co. were proposed. – USA, their main advantages are considered. The expediency of using a hydraulic network, which includes pipelines made of polypropylene material produced by “Aquatherm” – Germany, are substantiated; the main component of the pipelines is the material “Fusiolen”, the advantages of which are given in the article. An integral part is pumping equipment, consisting of centrifugal pumps for water supply (1VNS 60-66) and (VNSp 2.5) for supplying limestone suspension to irrigation nozzles of the transporting dump mass. Scientific novelty. Equipment for extinguishing coal mining waste (rock dumps) resistant to spontaneous combustion is proposed, in which the introduction of new structural elements and their interconnection is achieved by the continuous control and management of spraying per unit of the transported surface of the dump rock, dispersed with an inert substance (lime suspension), which prevents the formation of active combustion centers during the operation of waste heaps. Timely coverage of the dump mass with an inert substance reduces the time of contact of the rock with the environment, which is an important stage in the formation of rock dumps, especially of a conical shape, reduces the cost of operation and maintenance due to the formation of fire-resistant dumps, regardless of the influence of environmental conditions. Practical implication. Efficiency from the use of equipment for extinguishing coal waste can be obtained due to the continuous work achieved by covering the dump mass with an inert mixture during transportation, this reduces the contact of the rock with the environment, which is an important stage in the formation of rock dumps of a particularly conical shape, and reduces operating costs and their maintenance due to the formation of fire-resistant waste dumps regardless of the influence of environmental conditions.
{"title":"JUSTIFICATION OF PARAMETERS FOR SELECTING EQUIPMENT FOR EXTINGUISHING WASTE COAL","authors":"I. Chobotko","doi":"10.31474/1999-981x-2021-2-68-77","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-2-68-77","url":null,"abstract":"Purpose. Investigation of the choice of parameters of equipment for extinguishing coal mining wastes that go to the formation of waste dumps, the choice of the main components of equipment for the operation of technological units and a schematic diagram of equipment for extinguishing coal mining wastes are proposed. Methods. Analysis of existing approaches to technological solutions to prevent combustion of waste dumps; environmental assessment of alternative options for technological solutions to prevent combustion of waste dumps; creation of an environmentally friendly design technology for the use of coal mining waste. Results. Based on in-depth analysis of the main components of technological units for the operation of the equipment, MFP FullJet irrigation nozzles by Spraying Systems Co. were proposed. – USA, their main advantages are considered. The expediency of using a hydraulic network, which includes pipelines made of polypropylene material produced by “Aquatherm” – Germany, are substantiated; the main component of the pipelines is the material “Fusiolen”, the advantages of which are given in the article. An integral part is pumping equipment, consisting of centrifugal pumps for water supply (1VNS 60-66) and (VNSp 2.5) for supplying limestone suspension to irrigation nozzles of the transporting dump mass. Scientific novelty. Equipment for extinguishing coal mining waste (rock dumps) resistant to spontaneous combustion is proposed, in which the introduction of new structural elements and their interconnection is achieved by the continuous control and management of spraying per unit of the transported surface of the dump rock, dispersed with an inert substance (lime suspension), which prevents the formation of active combustion centers during the operation of waste heaps. Timely coverage of the dump mass with an inert substance reduces the time of contact of the rock with the environment, which is an important stage in the formation of rock dumps, especially of a conical shape, reduces the cost of operation and maintenance due to the formation of fire-resistant dumps, regardless of the influence of environmental conditions. Practical implication. Efficiency from the use of equipment for extinguishing coal waste can be obtained due to the continuous work achieved by covering the dump mass with an inert mixture during transportation, this reduces the contact of the rock with the environment, which is an important stage in the formation of rock dumps of a particularly conical shape, and reduces operating costs and their maintenance due to the formation of fire-resistant waste dumps regardless of the influence of environmental conditions.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127372431","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2022-2-14-24
H. Boichenko, O. Tkachuk
Purpose. Investigate the deformation characteristics of over-track coal aggregates as a way of protecting the preparatory workings and evaluate their impact on the stability of side rocks in the coal massif to ensure safe working conditions for miners in the mining areas. Method. To achieve the goal, laboratory studies of the deformation characteristics of protective structures in the form of whole coal were performed on models of equivalent materials. The models, with the ratio of sample length to width a/b=(1-2), were subjected to uniaxial compression. Results. It has been proven that the potential energy of coal aggregates is a function of their state, which takes into account the change in volume and shape under the action of an external load. It was experimentally established that under conditions of uniaxial compression in the range of changes in the relative deformation of coal aggregates 0.1≤λ≤0.25 depending on the size of the structures used, with an increase in the cross-sectional area of protective structures, the growth of the load continues without loss of their bearing capacity. Within the limits of the established safe deformation resource, the potential energy of overstretched coal units reaches a critical level, at which the stable state of the deformable structures is realised for a short time. At the transition of the critical level of the safe deformation resource, when λ>0.25, there is a loss of stability of the wholes, intensification of the convergence of the side rocks and their breaking, with subsequent collapse. Overstretched cells, within the limits of a safe deformation resource, are able to concentrate the potential energy of compression. The main element in the mechanism of destruction of over-stretched coal units is the critical density of elastic energy, the amount of which depends on their size. Scientific novelty. It was experimentally established that under the conditions of uniaxial compression of superstriped coal units with the ratio of their length to width a/b=(1-2) until the moment they lose stability, between the magnitude of the relative deformation and the change in the cross-sectional area of the used protective structures in contact with the side rocks in the produced space of the coal massif, there is a logarithmic functional dependence that allows determining their safe deformation resource. Practical significance. Coal targets, as protective structures of limited sizes, also have a limited safe deformation resource, which depends on the size of the structure and restrains the use of this method of protection of rollback stretches in the development of steep formations.
{"title":"RESEARCH OF THE DEFORMATION CHARACTERISTICS OF COAL PILLARS PROTECTIVE STRUCTURES OF HAULAGE DRIFTS","authors":"H. Boichenko, O. Tkachuk","doi":"10.31474/1999-981x-2022-2-14-24","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-2-14-24","url":null,"abstract":"Purpose. Investigate the deformation characteristics of over-track coal aggregates as a way of protecting the preparatory workings and evaluate their impact on the stability of side rocks in the coal massif to ensure safe working conditions for miners in the mining areas. Method. To achieve the goal, laboratory studies of the deformation characteristics of protective structures in the form of whole coal were performed on models of equivalent materials. The models, with the ratio of sample length to width a/b=(1-2), were subjected to uniaxial compression. Results. It has been proven that the potential energy of coal aggregates is a function of their state, which takes into account the change in volume and shape under the action of an external load. It was experimentally established that under conditions of uniaxial compression in the range of changes in the relative deformation of coal aggregates 0.1≤λ≤0.25 depending on the size of the structures used, with an increase in the cross-sectional area of protective structures, the growth of the load continues without loss of their bearing capacity. Within the limits of the established safe deformation resource, the potential energy of overstretched coal units reaches a critical level, at which the stable state of the deformable structures is realised for a short time. At the transition of the critical level of the safe deformation resource, when λ>0.25, there is a loss of stability of the wholes, intensification of the convergence of the side rocks and their breaking, with subsequent collapse. Overstretched cells, within the limits of a safe deformation resource, are able to concentrate the potential energy of compression. The main element in the mechanism of destruction of over-stretched coal units is the critical density of elastic energy, the amount of which depends on their size. Scientific novelty. It was experimentally established that under the conditions of uniaxial compression of superstriped coal units with the ratio of their length to width a/b=(1-2) until the moment they lose stability, between the magnitude of the relative deformation and the change in the cross-sectional area of the used protective structures in contact with the side rocks in the produced space of the coal massif, there is a logarithmic functional dependence that allows determining their safe deformation resource. Practical significance. Coal targets, as protective structures of limited sizes, also have a limited safe deformation resource, which depends on the size of the structure and restrains the use of this method of protection of rollback stretches in the development of steep formations.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134288984","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}
Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2021-1-7-18
M. Petlovanyi, K. Sai
Purpose. Analytical researches of the stress state of the backfilling stopes with different physical and mechanical properties using numerical modeling to determine possible zones of stability losses and predict their failure. Methods. Numerical modeling of the formation of stresses around a high stopes was carried out for the conditions of mining iron ore reserves in the depth intervals of 740-1040 m of the Pivdenno-Bilozerske deposit, where mining operations are actively carried out using the finite element method in the SolidWorks 2016 software package with reliable substantiation of the parameters of the developed geomechanical model. Results. Numerical simulation of the stress state of the backfilling mass are carried out at variable values of the modulus of its elasticity and the mining depth. It was found that with the existing actual physical and mechanical properties of the backfilling mass during the development of the Pivdenno-Bilozerske deposit, the danger of its failure is predicted at depths of more than 890 m. In the center of the filling array, the stress values change linearly, and at the junction of the roof with the side of the backfilled stopes – polynomial. It was found that an increase in the modulus of elasticity of the backfilling mass allows to reduce the compressive stresses only at the junction of the roof with the side of the backfilled stopes to a value of 800 MPa. Scientific novelty. With an increase in the depth of development, despite an increase in the elastic modulus of the fill, the values of stresses increase, which eliminates the need to increase it with a decrease in the mining depth it was found. Practical significance. The results obtained make it possible to correct the technology of formation of a backfilling mass in the primary stopes, taking into account the formation of stresses on its contour and, with an increase in the mining depth, to form a backfilling mass with viscoplastic properties.
{"title":"MODELING THE STRESS STATE OF THE BACKFILLING MASS WITH DIFFERENT PHYSICAL AND MECHANICAL PROPERTIES","authors":"M. Petlovanyi, K. Sai","doi":"10.31474/1999-981x-2021-1-7-18","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-1-7-18","url":null,"abstract":"Purpose. Analytical researches of the stress state of the backfilling stopes with different physical and mechanical properties using numerical modeling to determine possible zones of stability losses and predict their failure. Methods. Numerical modeling of the formation of stresses around a high stopes was carried out for the conditions of mining iron ore reserves in the depth intervals of 740-1040 m of the Pivdenno-Bilozerske deposit, where mining operations are actively carried out using the finite element method in the SolidWorks 2016 software package with reliable substantiation of the parameters of the developed geomechanical model. Results. Numerical simulation of the stress state of the backfilling mass are carried out at variable values of the modulus of its elasticity and the mining depth. It was found that with the existing actual physical and mechanical properties of the backfilling mass during the development of the Pivdenno-Bilozerske deposit, the danger of its failure is predicted at depths of more than 890 m. In the center of the filling array, the stress values change linearly, and at the junction of the roof with the side of the backfilled stopes – polynomial. It was found that an increase in the modulus of elasticity of the backfilling mass allows to reduce the compressive stresses only at the junction of the roof with the side of the backfilled stopes to a value of 800 MPa. Scientific novelty. With an increase in the depth of development, despite an increase in the elastic modulus of the fill, the values of stresses increase, which eliminates the need to increase it with a decrease in the mining depth it was found. Practical significance. The results obtained make it possible to correct the technology of formation of a backfilling mass in the primary stopes, taking into account the formation of stresses on its contour and, with an increase in the mining depth, to form a backfilling mass with viscoplastic properties.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129840594","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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