Pub Date : 2024-05-15DOI: 10.30686/1609-9192-2024-2-78-82
O.I. Cherskikh, V.S. Minakov, A.M. Makarov
Mining technological process as a sequence of changing the natural state of the Earth's subsoil to obtain a certain quantity and quality of mineral products is characterized by departures from the specified normative parameter values, which is due to causes of different nature. Most of these causes are man-made, anf they are created during the performance of specific process operations by the personnel. The article presents an original approach to managing the control over the technological process parameters in a coal strip mine. To reduce the magnitude and probability of the process departures from the normative values, the authors propose to create technical and organizational control loops. Each loop is a closed chain of technical means and organizational tools, which secures up-keeping of the normative technological process state. Production risk is proposed to be used as a criterion to assess the efficiency of the control loops. The methodology allowing to calculate the risk is described. The results of the contour approach application to the technological process control at the Solntsevsky coal strip mine are presented.
{"title":"Formation of control contours for technological process in a coal strip mine","authors":"O.I. Cherskikh, V.S. Minakov, A.M. Makarov","doi":"10.30686/1609-9192-2024-2-78-82","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-78-82","url":null,"abstract":"Mining technological process as a sequence of changing the natural state of the Earth's subsoil to obtain a certain quantity and quality of mineral products is characterized by departures from the specified normative parameter values, which is due to causes of different nature. Most of these causes are man-made, anf they are created during the performance of specific process operations by the personnel. The article presents an original approach to managing the control over the technological process parameters in a coal strip mine. To reduce the magnitude and probability of the process departures from the normative values, the authors propose to create technical and organizational control loops. Each loop is a closed chain of technical means and organizational tools, which secures up-keeping of the normative technological process state. Production risk is proposed to be used as a criterion to assess the efficiency of the control loops. The methodology allowing to calculate the risk is described. The results of the contour approach application to the technological process control at the Solntsevsky coal strip mine are presented.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"80 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973664","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 : 2024-05-15DOI: 10.30686/1609-9192-2024-2-127-133
N.N. Kuznetcov, A.K. Pak
The study of deformation and failure processes in rock masses is often carried out in laboratory conditions on samples. Widely used test equipment is used for this purpose, which makes it possible to create loading conditions similar to those inside the rock mass. Basically, the loading mode is implemented when forces are applied only to one side of the sample (along one axis), that is, uniaxial compression or tension. Test equipment that allows creation of loading along three axes, i.e. triaxial compression, is used less frequently. Such equipment is often very expensive, and testing requires a lot of time and resources. Nevertheless, this loading mode is one of the most interesting, since it is close to real conditions in the rock mass. This paper presents the results of experimental studies of ijolite-urtite samples (rocks from the Khibiny massif, the Kola Region) in conditions of uniaxial and triaxial compression. The purpose of the research is to establish how the values of the compressive strength of this rock change, to assess the critical values of the specific strain energy, as well as the tendency to dynamic destruction during the transition from the uniaxial loading mode to the triaxial one. The experimental studies revealed that there exists a sharper increase in the values of compressive strength and the critical values of specific strain energy of the ijolite-urtite samples in conditions of triaxial compression than under uniaxial compression. It has been established that the studied rock is prone to dynamic failure under uniaxial compression and preserve its tendency to this type of failure under triaxial compression.
{"title":"Investigation of physical and mechanical properties of ijolite-urtite under uniaxial and triaxial compression","authors":"N.N. Kuznetcov, A.K. Pak","doi":"10.30686/1609-9192-2024-2-127-133","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-127-133","url":null,"abstract":"The study of deformation and failure processes in rock masses is often carried out in laboratory conditions on samples. Widely used test equipment is used for this purpose, which makes it possible to create loading conditions similar to those inside the rock mass. Basically, the loading mode is implemented when forces are applied only to one side of the sample (along one axis), that is, uniaxial compression or tension. Test equipment that allows creation of loading along three axes, i.e. triaxial compression, is used less frequently. Such equipment is often very expensive, and testing requires a lot of time and resources. Nevertheless, this loading mode is one of the most interesting, since it is close to real conditions in the rock mass. This paper presents the results of experimental studies of ijolite-urtite samples (rocks from the Khibiny massif, the Kola Region) in conditions of uniaxial and triaxial compression. The purpose of the research is to establish how the values of the compressive strength of this rock change, to assess the critical values of the specific strain energy, as well as the tendency to dynamic destruction during the transition from the uniaxial loading mode to the triaxial one. The experimental studies revealed that there exists a sharper increase in the values of compressive strength and the critical values of specific strain energy of the ijolite-urtite samples in conditions of triaxial compression than under uniaxial compression. It has been established that the studied rock is prone to dynamic failure under uniaxial compression and preserve its tendency to this type of failure under triaxial compression.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"9 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972965","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 : 2024-05-15DOI: 10.30686/1609-9192-2024-2-116-120
M.G. Rakhutin, Tran Van Hiep, Le Van Loi
As the pump operates and wears out, the gap in the friction pairs increases and the volumetric efficiency decreases, the pump flow gets reduced, which leads to increasing duration of working and auxiliary operations, the operating cycle of the excavator, a decrease in its productivity and excessive fuel consumption. Infrequent pump replacement can lead to a significant increase in fuel consumption and reduced excavator performance. If the pump is replaced prematurely, its service life will not be used to the full extent. In order to develop a method for establishing optimal operating hours that allow minimizing fuel consumption and the cost of replacing a pump, taking into account operating conditions, a mathematical model of the pump operation is proposed, which makes it possible to obtain an expression for determining the differentiated optimal value of operating time between replacements. A calculation method and a software algorithm have been developed in the MatLab Simulink software suite to calculate the rate of decrease in the volumetric efficiency, as well as to establish the influence of volumetric efficiency on the fuel consumption and performance of a hydraulic excavator to be utilized in the model using the example of the HPV375 pump of the Komatsu PC2000-8 excavator, Based on the proposed mathematical model of the main pumps operation, a method has been developed for calculating the differentiated operating time between replacements of the main pumps of a mining hydraulic excavator, taking into account the rate of decrease in volumetric efficiency, replacement costs and damage due to changes in productivity and excessive fuel consumption. The dependence of the rate of changes in the volumetric efficiency of the pump is presented for the excavation, viscosity, contamination and temperature of the working fluid parameters. A coefficient of “reserve of partial engine power transferred to the pump” is proposed, determined by the ratio of the difference between the average maximum and initial partial power to the value of the initial partial power, which allows estimation of the operating time of the main pumps without affecting productivity of the excavator.
{"title":"Justification of the optimal operating time for the main pumps of a mining hydraulic excavator","authors":"M.G. Rakhutin, Tran Van Hiep, Le Van Loi","doi":"10.30686/1609-9192-2024-2-116-120","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-116-120","url":null,"abstract":"As the pump operates and wears out, the gap in the friction pairs increases and the volumetric efficiency decreases, the pump flow gets reduced, which leads to increasing duration of working and auxiliary operations, the operating cycle of the excavator, a decrease in its productivity and excessive fuel consumption. Infrequent pump replacement can lead to a significant increase in fuel consumption and reduced excavator performance. If the pump is replaced prematurely, its service life will not be used to the full extent. In order to develop a method for establishing optimal operating hours that allow minimizing fuel consumption and the cost of replacing a pump, taking into account operating conditions, a mathematical model of the pump operation is proposed, which makes it possible to obtain an expression for determining the differentiated optimal value of operating time between replacements. A calculation method and a software algorithm have been developed in the MatLab Simulink software suite to calculate the rate of decrease in the volumetric efficiency, as well as to establish the influence of volumetric efficiency on the fuel consumption and performance of a hydraulic excavator to be utilized in the model using the example of the HPV375 pump of the Komatsu PC2000-8 excavator, Based on the proposed mathematical model of the main pumps operation, a method has been developed for calculating the differentiated operating time between replacements of the main pumps of a mining hydraulic excavator, taking into account the rate of decrease in volumetric efficiency, replacement costs and damage due to changes in productivity and excessive fuel consumption. The dependence of the rate of changes in the volumetric efficiency of the pump is presented for the excavation, viscosity, contamination and temperature of the working fluid parameters. A coefficient of “reserve of partial engine power transferred to the pump” is proposed, determined by the ratio of the difference between the average maximum and initial partial power to the value of the initial partial power, which allows estimation of the operating time of the main pumps without affecting productivity of the excavator.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"23 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973065","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 : 2024-05-15DOI: 10.30686/1609-9192-2024-2-147-150
M.P. Kulikova, L.Kh. Tas-ool
INTRODUCTION. Currently, a coal mining territory is being formed in the Republic of Tyva, the volume of coal mining, the “carbon intensity” of production, and СО2 emissions into the atmosphere are increasing. Emissions of the man-made СО2 into the atmosphere caused by combustion of hydrocarbon fuels, wildfires, deforestation and land use development change the natural СО2 balance in the atmosphere, which is manifested in the photosynthesis and respiration processes of plants with the formation of natural carbon sinks. OBJECTIVES. The research aims to correlate the calculated data on the degree of atmospheric pollution by carbon dioxide emissions from stationary and mobile sources with the sequestration potential (with respect to СО2) of the forest and steppe ecosystems of the Republic of Tyva. RESULTS. The sequestration potential of the ecosystems of the Republic of Tyva makes it possible to capture both its own carbon dioxide emissions (fuel combustion) and those introduced from other regions. CONCLUSIONS. The total impact of the man-made СО2 on the atmosphere in the city of Kyzyl relative to other regions is low, amounting to 1,41 million t-eq СО2/year; currently, the territory of the Republic of Tyva is characterized by an excess of the sequestration capacity of man-made СО2 (7,46 million t-eq СО2/year).
{"title":"On sequestration of man-made carbon dioxide by forests and steppe vegetation of the Republic of Tyva","authors":"M.P. Kulikova, L.Kh. Tas-ool","doi":"10.30686/1609-9192-2024-2-147-150","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-147-150","url":null,"abstract":"INTRODUCTION. Currently, a coal mining territory is being formed in the Republic of Tyva, the volume of coal mining, the “carbon intensity” of production, and СО2 emissions into the atmosphere are increasing. Emissions of the man-made СО2 into the atmosphere caused by combustion of hydrocarbon fuels, wildfires, deforestation and land use development change the natural СО2 balance in the atmosphere, which is manifested in the photosynthesis and respiration processes of plants with the formation of natural carbon sinks. OBJECTIVES. The research aims to correlate the calculated data on the degree of atmospheric pollution by carbon dioxide emissions from stationary and mobile sources with the sequestration potential (with respect to СО2) of the forest and steppe ecosystems of the Republic of Tyva. RESULTS. The sequestration potential of the ecosystems of the Republic of Tyva makes it possible to capture both its own carbon dioxide emissions (fuel combustion) and those introduced from other regions. CONCLUSIONS. The total impact of the man-made СО2 on the atmosphere in the city of Kyzyl relative to other regions is low, amounting to 1,41 million t-eq СО2/year; currently, the territory of the Republic of Tyva is characterized by an excess of the sequestration capacity of man-made СО2 (7,46 million t-eq СО2/year).","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"62 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972471","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 : 2024-05-15DOI: 10.30686/1609-9192-2024-2-71-76
Coal mining companies, especially those involved in underground operations, are currently at different stages on their way to digitalization and face a number of challenges, which are described in the article. One group of such problems is the difficulties concerned with the coal mine dispatching control. The paper shows how a properly selected approach, i.e. the integration of various automated process control systems with positioning systems, provides a solution to these problems and offers significant advantages both regarding the industrial safety and maximizing the economic effect. Examples of such integration are given for the conveyor transport control system, for the air and mine gas control systems as well as a CCTV systems with positioning systems within the Smart Mine® complex. An assessment of the current technical basis for the implementation of this approach is given, and the advantages of using a single platform for subsystems of the multi-functional safety system and production management systems are shown.
{"title":"Advantages of integrating automated process control systems of coal mines with positioning systems","authors":"","doi":"10.30686/1609-9192-2024-2-71-76","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-71-76","url":null,"abstract":"Coal mining companies, especially those involved in underground operations, are currently at different stages on their way to digitalization and face a number of challenges, which are described in the article. One group of such problems is the difficulties concerned with the coal mine dispatching control. The paper shows how a properly selected approach, i.e. the integration of various automated process control systems with positioning systems, provides a solution to these problems and offers significant advantages both regarding the industrial safety and maximizing the economic effect. Examples of such integration are given for the conveyor transport control system, for the air and mine gas control systems as well as a CCTV systems with positioning systems within the Smart Mine® complex. An assessment of the current technical basis for the implementation of this approach is given, and the advantages of using a single platform for subsystems of the multi-functional safety system and production management systems are shown.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"65 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972186","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 : 2024-05-15DOI: 10.30686/1609-9192-2024-2-121-126
S. V. Cherdantsev, P. Shlapakov, K. Lebedev, A. Erastov, S. A. Khaymin
The underground mining of coal deposits is usually accompanied by manifestation of a number of negative factors, one of which is the presence of dust and gas-air mixtures consisting of fine coal dust, methane released from the broken coal and the air of the mine atmosphere. Despite modern methods and means of dust suppression and dust collection, it has not yet been possible to achieve complete neutralization of dust and gas-air mixtures in the atmosphere of mine workings. The negative effects of dust and gas-air mixtures can manifest themselves in different ways. On the one hand, deposits of coal dust in the worked-out spaces, under certain conditions, form foci of spontaneous combustion, which are the causes of endogenous fires. On the other hand, dust and gas-air mixtures are predisposed to ignition from external sources or to spontaneous ignition followed by combustion in the form of deflagration, which, under certain conditions, turns into detonation, spreading in the atmosphere of mine workings at supersonic speed. This article considers a nonstationary one-dimensional problem of selfignition of dust and gas-air mixtures in the air flows of mine workings. The temperature and the period of spontaneous ignition of dust-gas-air mixtures are found based on the solution of this problem, expressed numerically using the Geer method. An analysis of the mixture self-ignition process is performed and some patterns of the influence of the parameters of mixtures on the period of their self-ignition are revealed.
{"title":"Self-ignition of dust and gas-air mixtures in the atmosphere of mine workings","authors":"S. V. Cherdantsev, P. Shlapakov, K. Lebedev, A. Erastov, S. A. Khaymin","doi":"10.30686/1609-9192-2024-2-121-126","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-121-126","url":null,"abstract":"The underground mining of coal deposits is usually accompanied by manifestation of a number of negative factors, one of which is the presence of dust and gas-air mixtures consisting of fine coal dust, methane released from the broken coal and the air of the mine atmosphere. Despite modern methods and means of dust suppression and dust collection, it has not yet been possible to achieve complete neutralization of dust and gas-air mixtures in the atmosphere of mine workings. The negative effects of dust and gas-air mixtures can manifest themselves in different ways. On the one hand, deposits of coal dust in the worked-out spaces, under certain conditions, form foci of spontaneous combustion, which are the causes of endogenous fires. On the other hand, dust and gas-air mixtures are predisposed to ignition from external sources or to spontaneous ignition followed by combustion in the form of deflagration, which, under certain conditions, turns into detonation, spreading in the atmosphere of mine workings at supersonic speed. This article considers a nonstationary one-dimensional problem of selfignition of dust and gas-air mixtures in the air flows of mine workings. The temperature and the period of spontaneous ignition of dust-gas-air mixtures are found based on the solution of this problem, expressed numerically using the Geer method. An analysis of the mixture self-ignition process is performed and some patterns of the influence of the parameters of mixtures on the period of their self-ignition are revealed.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"66 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140973967","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 : 2024-05-15DOI: 10.30686/1609-9192-2024-2-111-115
V.N. Kalmykov, A. Gogotin, V.S. Galyamov, A.S. Tarabaev
The article presents the results of studying physical and mechanical properties of thickened concentration tailings, as well as regularities in their changes during the dumping process in mined-out spaces of open-pits. The necessity of experimental studies is explained by the existing discrepancy between the parameters of the artificial hydraulic deposition of soils and the design solutions, in particular, the spreading angles, the lack of a ponding zone created within the rock mass body, as well as the insignificant influence on the intakes of the dewatering plant. The following characteristics of the thickened tailings that define the parameters of the hydraulic deposition technology and the artificial massif formed inside the pit at the design stage were taken as the research objects: density, mineral density, absolute and relative moisture content, storactivity, viscosity, shear stress, flowing angle, and water conductivity. These characteristics were tested using conventional methods. Representative samples were collected at the discharge points of the thickened tailings in the open pit and directly at the discharge point of the thickener No.2 at the paste thickening plant. It was established that as the thickened tailings are transported to the place of their deposition inside the open pit, no changes take place in their density, moisture content, and water conductivity, but the rheological properties, such as viscosity, shear stress, angle of spreading undergo a significant change, which should be taken into account in design solutions. Being familiar with the technology of thickening, transportation and storage of paste mixtures in open-pit mines allows us to consider the mechanical impact on the pulp flocculi and their destruction, consisting in the rupture of the macromolecules, as the main cause of changes in the structure and properties of the thickened tailings.
{"title":"Studies of physical and mechanical properties of thickened concentration tailings and artificial rock masses resulting from their disposal in mined-out spaces of open-pits","authors":"V.N. Kalmykov, A. Gogotin, V.S. Galyamov, A.S. Tarabaev","doi":"10.30686/1609-9192-2024-2-111-115","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-111-115","url":null,"abstract":"The article presents the results of studying physical and mechanical properties of thickened concentration tailings, as well as regularities in their changes during the dumping process in mined-out spaces of open-pits. The necessity of experimental studies is explained by the existing discrepancy between the parameters of the artificial hydraulic deposition of soils and the design solutions, in particular, the spreading angles, the lack of a ponding zone created within the rock mass body, as well as the insignificant influence on the intakes of the dewatering plant. The following characteristics of the thickened tailings that define the parameters of the hydraulic deposition technology and the artificial massif formed inside the pit at the design stage were taken as the research objects: density, mineral density, absolute and relative moisture content, storactivity, viscosity, shear stress, flowing angle, and water conductivity. These characteristics were tested using conventional methods. Representative samples were collected at the discharge points of the thickened tailings in the open pit and directly at the discharge point of the thickener No.2 at the paste thickening plant. It was established that as the thickened tailings are transported to the place of their deposition inside the open pit, no changes take place in their density, moisture content, and water conductivity, but the rheological properties, such as viscosity, shear stress, angle of spreading undergo a significant change, which should be taken into account in design solutions. Being familiar with the technology of thickening, transportation and storage of paste mixtures in open-pit mines allows us to consider the mechanical impact on the pulp flocculi and their destruction, consisting in the rupture of the macromolecules, as the main cause of changes in the structure and properties of the thickened tailings.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"43 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140972745","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 : 2024-05-15DOI: 10.30686/1609-9192-2024-2-134-138
M.V. Pavlenko, E.V. Sinitskaya, I. A. Florova, D.G. Sandakova
The use of vibration effects for the effective preparation of a low–permeability coal seam is a fairly promising and constantly improving process. The main difficulty of theoretical research is the fact that coal seams are very diverse in their properties and represent a complex environment. Under the influence of vibration, the capacitive and filtration characteristics of the coal massif change. This leads to a change in the structure and capacity of the porous-fissured space of coal. This reaction finds a good explanation: each act of vibration action causes a rapid change in the coal mass in accordance with the operating stresses during vibration. This point of view was used as the basis for theoretical reasoning, in order to justify the rational impact of directional vibration on the coal seam, to change fracturing and further intensify methane recovery. This is confirmed by both laboratory and industrial experiments on vibration effects. Changes in the environment after strong earthquakes are of a similar nature, even at great distances from the source of the impact. Therefore, the simplest in terms of constructive implementation and less costly in terms of energy and material consumption is a directed oscillatory process on a low-permeability coal seam, which is performed using vibration installations of both surface and underground design.
{"title":"Causes of fracturing and evidence of coal seam deforming in the vibration impact zone","authors":"M.V. Pavlenko, E.V. Sinitskaya, I. A. Florova, D.G. Sandakova","doi":"10.30686/1609-9192-2024-2-134-138","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-2-134-138","url":null,"abstract":"The use of vibration effects for the effective preparation of a low–permeability coal seam is a fairly promising and constantly improving process. The main difficulty of theoretical research is the fact that coal seams are very diverse in their properties and represent a complex environment. Under the influence of vibration, the capacitive and filtration characteristics of the coal massif change. This leads to a change in the structure and capacity of the porous-fissured space of coal. This reaction finds a good explanation: each act of vibration action causes a rapid change in the coal mass in accordance with the operating stresses during vibration. This point of view was used as the basis for theoretical reasoning, in order to justify the rational impact of directional vibration on the coal seam, to change fracturing and further intensify methane recovery. This is confirmed by both laboratory and industrial experiments on vibration effects. Changes in the environment after strong earthquakes are of a similar nature, even at great distances from the source of the impact. Therefore, the simplest in terms of constructive implementation and less costly in terms of energy and material consumption is a directed oscillatory process on a low-permeability coal seam, which is performed using vibration installations of both surface and underground design.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"139 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140976816","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 : 2024-03-15DOI: 10.30686/1609-9192-2024-1-66-69
A.V. Mikhailov, A. Zhigulskaya, Yu.A. Kazakov
The article analyzes a rational scheme of bulldozer technology of complex surface layer-wise extraction of peat raw materials and wood remains, which contributes to energy and resource saving. Complete extraction of useful components from peat deposits is achieved based on the environmental principles of rational use of natural resources. Agro-industrial and environmental protection are currently becoming promising directions for the use of peat raw materials. The ways of technical retooling and enhancing the efficiency of equipment operation are considered with account for the scale factor of the peat-mining companies. The advantages of the peat mining technology, which can be used in small-scale peat mining companies, are shown. The choice of equipment for the bulldozer technology is made with consideration of the limiting conditions for its application, reduction of the energy intensity of the process; equipment match by technical specifications; versatility and multitask capability.
{"title":"Rational technology for integrated mining of peat deposits","authors":"A.V. Mikhailov, A. Zhigulskaya, Yu.A. Kazakov","doi":"10.30686/1609-9192-2024-1-66-69","DOIUrl":"https://doi.org/10.30686/1609-9192-2024-1-66-69","url":null,"abstract":"The article analyzes a rational scheme of bulldozer technology of complex surface layer-wise extraction of peat raw materials and wood remains, which contributes to energy and resource saving. Complete extraction of useful components from peat deposits is achieved based on the environmental principles of rational use of natural resources. Agro-industrial and environmental protection are currently becoming promising directions for the use of peat raw materials. The ways of technical retooling and enhancing the efficiency of equipment operation are considered with account for the scale factor of the peat-mining companies. The advantages of the peat mining technology, which can be used in small-scale peat mining companies, are shown. The choice of equipment for the bulldozer technology is made with consideration of the limiting conditions for its application, reduction of the energy intensity of the process; equipment match by technical specifications; versatility and multitask capability.","PeriodicalId":506182,"journal":{"name":"Mining Industry Journal (Gornay Promishlennost)","volume":"74 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140238485","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 : 2024-03-15DOI: 10.30686/1609-9192-2024-1-126-131
A.A. Kozyrev, N.N. Kuznecov, A.K. Pak
When studying physical and mechanical properties of rocks, one of the main parameters to be determined is their uniaxial compressive strength. During laboratory experiments, the value of this parameter can be influenced by both loading conditions and the shape of the prepared samples. By studying the impact of these factors, it is possible to give an adequate assessment of changes in the strength of rocks, as well as to predict their failure behavior. The paper presents the results of experimental studies of hard rocks from the Kola region deposits under uniaxial compression. The values of the rock strength at loading rates from 0.01 to 50 kN/s were established. On the basis of the obtained data it was revealed that the V.A. Fokin criterion can be used to determine the rated strength of rocks. It is shown that the values of uniaxial compressive strength of brittle elastic rock (urtite) and non-brittle elastic-plastic rock (carbonatite) will also increase with the increasing loading rate. It is established that for hard rocks prone to dynamic failure, an increase in the loading rate will lead to an increase in the intensity of their failure. Increasing the loading rate for non-brittle elastic-plastic rocks can cause them to start failing dynamically. The obtained conclusions indicate that the failure behavior of rock samples depends on the time factor of loading.
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