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-2019-1-73-78
B. Kodunov
{"title":"REGULARITIES DISPLACEMENT OF PARTICLES IN THE SHIFT TROUGH","authors":"B. Kodunov","doi":"10.31474/1999-981x-2019-1-73-78","DOIUrl":"https://doi.org/10.31474/1999-981x-2019-1-73-78","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"64 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":"127851836","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-2022-2-122-135
A. Khorolskyi
Purpose. To develop a new approach to the design of processes for the development of mineral deposits based on the justification of the area of rational exploitation. Methods. To develop a new approach, a decomposition approach was used to represent the cycle of field development; optimisation algorithms on networks and graphs – to find the optimal solution; marginal analysis – to justify the rational volume of mineral extraction. Application of these approaches allows developing a decision support system. Findings. A new approach to the evaluation and selection of parameters is presented, a characteristic feature of which is that the mineral itself is not considered “as the final product”to be extracted, but only as an intermediate link in the structure of energy generation, metal smelting, etc. This allows considering the process of exploitation through the change in the state of reserves, which in turn forms the development strategy. The development strategy involves the construction of scenarios (economic, environmental) within the framework of which the “narrow” task related to the organisation of work, cost optimisation, etc. is solved. It is proved that the efficiency of the technological scheme is an integral indicator, which is formed by a group of technological, operational, economic factors within the field of rational design and depends on functional relationships. As an example, the technological processes of a coal mine as a component of an electric power generation system are considered in a complex. Originality. The scientific novelty of the work is to establish the laws of formation of the efficiency of the processes of development of mineral deposits. It was established that the increase in the efficiency of the processes of mineral deposits development is achieved based on increasing the reliability of technological schemes, which is directly proportional to the functional relationships and inversely proportional to the resources involved, by optimising network models that demonstrate the heterogeneity and probabilistic nature of the formation of the level of efficiency. For the first time, the processes that accompany the development of mineral deposits are considered through the change in the state of mineral reserves, that is, the task of designing a separate process is considered as an intermediate link in the overall system of production links. It is established that for the design of field development processes, it is necessary to substantiate the area of rational operation, which involves a comprehensive representation of the field development cycle in the form of a hierarchical structure, based on the category of “quality”, which in turn forms strategies; strategies form scenarios, and scenarios contain parameters; optimization of each parameter involves the assessment of priority control factors. For the first time an algorithm for optimal design of mineral deposit development is proposed, which involves determining th
{"title":"RESULTS OF RESEARCH ON THE DEVELOPMENT OF A DECISION SUPPORT SYSTEM FOR THE DESIGN OF MINERAL DEPOSITS DEVELOPMENT PROCESSES","authors":"A. Khorolskyi","doi":"10.31474/1999-981x-2022-2-122-135","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-2-122-135","url":null,"abstract":"Purpose. To develop a new approach to the design of processes for the development of mineral deposits based on the justification of the area of rational exploitation. Methods. To develop a new approach, a decomposition approach was used to represent the cycle of field development; optimisation algorithms on networks and graphs – to find the optimal solution; marginal analysis – to justify the rational volume of mineral extraction. Application of these approaches allows developing a decision support system. Findings. A new approach to the evaluation and selection of parameters is presented, a characteristic feature of which is that the mineral itself is not considered “as the final product”to be extracted, but only as an intermediate link in the structure of energy generation, metal smelting, etc. This allows considering the process of exploitation through the change in the state of reserves, which in turn forms the development strategy. The development strategy involves the construction of scenarios (economic, environmental) within the framework of which the “narrow” task related to the organisation of work, cost optimisation, etc. is solved. It is proved that the efficiency of the technological scheme is an integral indicator, which is formed by a group of technological, operational, economic factors within the field of rational design and depends on functional relationships. As an example, the technological processes of a coal mine as a component of an electric power generation system are considered in a complex. Originality. The scientific novelty of the work is to establish the laws of formation of the efficiency of the processes of development of mineral deposits. It was established that the increase in the efficiency of the processes of mineral deposits development is achieved based on increasing the reliability of technological schemes, which is directly proportional to the functional relationships and inversely proportional to the resources involved, by optimising network models that demonstrate the heterogeneity and probabilistic nature of the formation of the level of efficiency. For the first time, the processes that accompany the development of mineral deposits are considered through the change in the state of mineral reserves, that is, the task of designing a separate process is considered as an intermediate link in the overall system of production links. It is established that for the design of field development processes, it is necessary to substantiate the area of rational operation, which involves a comprehensive representation of the field development cycle in the form of a hierarchical structure, based on the category of “quality”, which in turn forms strategies; strategies form scenarios, and scenarios contain parameters; optimization of each parameter involves the assessment of priority control factors. For the first time an algorithm for optimal design of mineral deposit development is proposed, which involves determining th","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"1 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":"129118759","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-2019-1-41-52
S. Nehrii
{"title":"DETERMINATION OF DISPLACEMENT THE ROOF OF THE MINING WORKINGS IN THE ZONE OF INFLUENCE OF LONGWALL FACE","authors":"S. Nehrii","doi":"10.31474/1999-981X-2019-1-41-52","DOIUrl":"https://doi.org/10.31474/1999-981X-2019-1-41-52","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"18 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":"117019022","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.
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