Purpose. Study and development of a rational methodology for calculating the parameters of the process of downhole hydrodisintegration of martite ore massifs by pressure rotating water jets. Methods. Mine experimental-methodical and experimental-experimental works on: stage-by-stage study of the engineering and geological situation of ore deposits and selection of experimental sites; development of technological schemes for the hydrodisintegration of the ore in place and the creation of appropriate experimental equipment; selection of means for providing hydro-extracting operations; the choice of methods for monitoring and measuring the parameters of the hydrodisintegration process; generalization and analysis of the results of experiments and development of recommendations for the creation of technology and equipment, taking into account the achieved indicators. Results. A technique for calculating the parameters of hydrodisintegration of rich martite ores martite ore in places has been developed based on the study of the features of the formation of rotating compact water jets by borehole hydromonitors. Scientific novelty. Relationships between the structural and morphological characteristics and jointing of martite ores (porosity, the ratio of the grain composition of the ore, the ultimate uniaxial compression strength of ore and lumpiness) and the parameters of the hydromonitoring effect (water pressure, the initial diameter of the jet and the speed of its movement along the exposure of the face), which make it possible to determine rational technological parameters of hydrodisintegration products. Practical implication. Borehole hydromonitor disintegration of martite ores in place is a combined ore preparation process, including enrichment grinding operations and classification of destruction products according to their granulometric composition during their erosion. At the same time, there is a selective opening of ore-forming minerals that improve the quality of the ore by 0.5–1.5% compared to natural, a decrease in the mass fraction of silica from 2.0–1.2 to 0.5–0.3%, which ensures the production of iron ore raw materials of the highest quality – superconcentrates with an iron content of 69.0–69.5%. Control of the granulometric composition of hydrodisintegration products is achieved by adjusting the initial water pressure at the outlet of the jet nozzle, the speed of the jet along the face exposure and the orientation of the jet relative to the elements of occurrence and texture of the ores.
{"title":"EXPERIMENTAL RESEARCH AND DEVELOPMENT OF A METHOD FOR CALCULATING THE PARAMETERS OF BOREHOLE HYDROMONITOR DISINTEGRATION OF RICH IRON ORE IN PLACE","authors":"Tarasyutin Viktor, Kosenko Andrii, Khomenko Oleh, Kononenko Maksym","doi":"10.31474/1999-981x-2023-1-86-96","DOIUrl":"https://doi.org/10.31474/1999-981x-2023-1-86-96","url":null,"abstract":"Purpose. Study and development of a rational methodology for calculating the parameters of the process of downhole hydrodisintegration of martite ore massifs by pressure rotating water jets.\u0000\u0000Methods. Mine experimental-methodical and experimental-experimental works on: stage-by-stage study of the engineering and geological situation of ore deposits and selection of experimental sites; development of technological schemes for the hydrodisintegration of the ore in place and the creation of appropriate experimental equipment; selection of means for providing hydro-extracting operations; the choice of methods for monitoring and measuring the parameters of the hydrodisintegration process; generalization and analysis of the results of experiments and development of recommendations for the creation of technology and equipment, taking into account the achieved indicators.\u0000\u0000Results. A technique for calculating the parameters of hydrodisintegration of rich martite ores martite ore in places has been developed based on the study of the features of the formation of rotating compact water jets by borehole hydromonitors.\u0000\u0000Scientific novelty. Relationships between the structural and morphological characteristics and jointing of martite ores (porosity, the ratio of the grain composition of the ore, the ultimate uniaxial compression strength of ore and lumpiness) and the parameters of the hydromonitoring effect (water pressure, the initial diameter of the jet and the speed of its movement along the exposure of the face), which make it possible to determine rational technological parameters of hydrodisintegration products.\u0000\u0000Practical implication. Borehole hydromonitor disintegration of martite ores in place is a combined ore preparation process, including enrichment grinding operations and classification of destruction products according to their granulometric composition during their erosion. At the same time, there is a selective opening of ore-forming minerals that improve the quality of the ore by 0.5–1.5% compared to natural, a decrease in the mass fraction of silica from 2.0–1.2 to 0.5–0.3%, which ensures the production of iron ore raw materials of the highest quality – superconcentrates with an iron content of 69.0–69.5%. Control of the granulometric composition of hydrodisintegration products is achieved by adjusting the initial water pressure at the outlet of the jet nozzle, the speed of the jet along the face exposure and the orientation of the jet relative to the elements of occurrence and texture of the ores.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"37 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":"133449975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. Improving the process of managing occupational risks from industrial hazards: development of work safety analysis maps. Methodology. To improve the process of occupational risk management, the well-known approach “Occupational safety analysis” is used, which is described in the standard developed by the Occupational Safety and Health Administration of the USA under number OSHA 3071:2002. This approach provides for the identification of dangers and threats that affect an employee during the performance of each stage of the production task: preparation for work, carrying out work, completion of work, emergency situations, etc. Each of the stages can be divided into additional steps, the analysis of which will allow detailing the dangers and assessing the risk to justify preventive measures. Findings. The process of managing professional risks has been improved due to the development of work safety analysis maps, which were carried out taking into account changes in dangerous factors overtime during the production operation. It was determined that dangerous factors that increase the probability of the occurrence of a dangerous event can change over time, which under certain conditions increases the amount of occupational risk. A matrix for the assessment of occupational risks is proposed, which provides for the determination of the magnitude of the occupational risk both for a separate hazardous factor and for a combination of hazardous factors during the performance of a certain stage of work. The limits of the permissible value of occupational risk, which does not lead to serious losses of the employee’s health level, have been established. An example of occupational risk assessment is presented, taking into account the influence of a number of dangerous factors that change over time during preparation for the operation of moving timber onto a vehicle. Dangerous factors that can change over time have been identified and their impact on the probability and severity of the consequences of the occurrence of a dangerous event has been assessed. Originality. The regularities of the formation of the work safety analysis procedure, taking into account the variability of risks during the performance of production work, have been determined. Practical value. A work performance safety analysis map has been developed for the hydraulic manipulator operator, in which the levels of professional risks are established for each dangerous factor in accordance with the stage of work performance.
{"title":"IMPROVING THE PROCESS OF OCCUPATIONAL RISK MANAGEMENT THROUGH THE DEVELOPMENT OF WORK PERFORMANCE SAFETY ANALYSIS CARDS","authors":"Cheberiachko Serhii, Yavorska Olena, Ikonnikov Maksym, Yavorskyi Andrii, Hilpert Vitaliy","doi":"10.31474/1999-981x-2023-1-126-135","DOIUrl":"https://doi.org/10.31474/1999-981x-2023-1-126-135","url":null,"abstract":"Purpose. Improving the process of managing occupational risks from industrial hazards: development of work safety analysis maps.\u0000\u0000Methodology. To improve the process of occupational risk management, the well-known approach “Occupational safety analysis” is used, which is described in the standard developed by the Occupational Safety and Health Administration of the USA under number OSHA 3071:2002. This approach provides for the identification of dangers and threats that affect an employee during the performance of each stage of the production task: preparation for work, carrying out work, completion of work, emergency situations, etc. Each of the stages can be divided into additional steps, the analysis of which will allow detailing the dangers and assessing the risk to justify preventive measures.\u0000\u0000Findings. The process of managing professional risks has been improved due to the development of work safety analysis maps, which were carried out taking into account changes in dangerous factors overtime during the production operation. It was determined that dangerous factors that increase the probability of the occurrence of a dangerous event can change over time, which under certain conditions increases the amount of occupational risk. A matrix for the assessment of occupational risks is proposed, which provides for the determination of the magnitude of the occupational risk both for a separate hazardous factor and for a combination of hazardous factors during the performance of a certain stage of work. The limits of the permissible value of occupational risk, which does not lead to serious losses of the employee’s health level, have been established. An example of occupational risk assessment is presented, taking into account the influence of a number of dangerous factors that change over time during preparation for the operation of moving timber onto a vehicle. Dangerous factors that can change over time have been identified and their impact on the probability and severity of the consequences of the occurrence of a dangerous event has been assessed.\u0000\u0000Originality. The regularities of the formation of the work safety analysis procedure, taking into account the variability of risks during the performance of production work, have been determined.\u0000\u0000Practical value. A work performance safety analysis map has been developed for the hydraulic manipulator operator, in which the levels of professional risks are established for each dangerous factor in accordance with the stage of work performance.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"3 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":"132131464","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-2022-1-124-131
M. Rudynets, V. Fedorchuk-Moroz
Purpose: The goal is to develop means to improve the public knowledge and skills for emergencies using an innovative project approach. Methodology: use of special research methods – collecting and summarizing information, critical analysis and forecasting, sociological surveys, and statistical data processing by Excel. Results. The expediency of development and implementation of projects aimed at getting the population interested in emergencies while in public places is determined. It was found that the emergency training system does not contain a component of motivating the population to master the necessary skills. The proposed project satisfies all stakeholders. The project approach will increase the population’s interest in preparing for emergencies and help reduce the overall psychological stress. The possibility of using these projects is confirmed through theoretical and practical results obtained by opinion polls. Under martial law, the proposed project can help reduce the psychological burden and avoid panic among mall visitors оf public places. Scientific novelty: the research describes the first substantiated possibility of using a project approach to improving the system of preparation and getting the population interested in actions during emergencies in public places. Practical significance: popularizing safety measures in emergencies in public places. The proposed solutions will increase knowledge and reduce the risk of injury to people in emergencies.
{"title":"INNOVATIVE PROJECT APPROACH TO RAISING PUBLIC INTEREST IN EMERGENCY PROTECTION","authors":"M. Rudynets, V. Fedorchuk-Moroz","doi":"10.31474/1999-981x-2022-1-124-131","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-1-124-131","url":null,"abstract":"Purpose: The goal is to develop means to improve the public knowledge and skills for emergencies using an innovative project approach. Methodology: use of special research methods – collecting and summarizing information, critical analysis and forecasting, sociological surveys, and statistical data processing by Excel. Results. The expediency of development and implementation of projects aimed at getting the population interested in emergencies while in public places is determined. It was found that the emergency training system does not contain a component of motivating the population to master the necessary skills. The proposed project satisfies all stakeholders. The project approach will increase the population’s interest in preparing for emergencies and help reduce the overall psychological stress. The possibility of using these projects is confirmed through theoretical and practical results obtained by opinion polls. Under martial law, the proposed project can help reduce the psychological burden and avoid panic among mall visitors оf public places. Scientific novelty: the research describes the first substantiated possibility of using a project approach to improving the system of preparation and getting the population interested in actions during emergencies in public places. Practical significance: popularizing safety measures in emergencies in public places. The proposed solutions will increase knowledge and reduce the risk of injury to people in emergencies.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"30 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":"130578745","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-2021-2-7-14
S. Bashynskyi, V. Kotenko, Maryna Kolodiy, Viktor Pidvysotskyi
Aim. Developing the theory of diamond wire cutting of crystalline rocks for separating the facing stone blocks from the array by establishing links between individual geometric parameters of the side and the cutting process. Research methods. To achieve this aim were used the next method: analytical studies of the relationship between the geometric parameters of the process of diamond wire cutting, experimental study of the same geometric parameters of the process of diamond wire cutting of high-strength rocks to confirm or refute previously obtained analytical relationships, and statistical processing of data. Results. The length of contact of the diamond wire with the rock is an important criterion for the process of separating the blocks of facing rocks from the array. Given the unavailability of the diamond wire side in the array for direct measurement methods, there is a need for indirect determination of the contact length. It is proposed to use the length of the free section of the wire, as the total length of the wire remains unchanged during the cutting process. It is assumed that the length of the free section can be estimated by the distance between the diamond wire machine installation and the slope of the ledge. Analytical dependences between the specified sizes are considered. The existence of the obtained dependences and the strength of the correlation connection was confirmed by experimental studies in the conditions of the block quarry of the facing stone. Scientific novelty. At first time, the relationship between the distance of the diamond wire machine installation and the side of the diamond wire and the length of the free section of the diamond edging, which allows to control the length of contact of the diamond wire with rock in the cut. The obtained dependence is analyzed and it is concluded that the geometric parameters of the ledge will affect the length of the cut only in the initial stages of separation of the block of natural stone from the array. In the next stages, the length of the free section of the diamond wire depends only on the distance of the location of the diamond wire machine installation and the side of the diamond rope. Practical significance. The value of the optimal initial distance of the diamond wire machine placement to the slope of the ledge is found. The empirical dependence of the length of the free section of the diamond wire on the location of the diamond wire machine is also obtained
{"title":"RESEARCH OF THE GEOMETRIC PARAMETERS CHANGING DURING SEPARATION THE HIGH-STRENGTH STONES MONOLITES WITH DIAMOND WIRE MACHINES","authors":"S. Bashynskyi, V. Kotenko, Maryna Kolodiy, Viktor Pidvysotskyi","doi":"10.31474/1999-981x-2021-2-7-14","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-2-7-14","url":null,"abstract":"Aim. Developing the theory of diamond wire cutting of crystalline rocks for separating the facing stone blocks from the array by establishing links between individual geometric parameters of the side and the cutting process. Research methods. To achieve this aim were used the next method: analytical studies of the relationship between the geometric parameters of the process of diamond wire cutting, experimental study of the same geometric parameters of the process of diamond wire cutting of high-strength rocks to confirm or refute previously obtained analytical relationships, and statistical processing of data. Results. The length of contact of the diamond wire with the rock is an important criterion for the process of separating the blocks of facing rocks from the array. Given the unavailability of the diamond wire side in the array for direct measurement methods, there is a need for indirect determination of the contact length. It is proposed to use the length of the free section of the wire, as the total length of the wire remains unchanged during the cutting process. It is assumed that the length of the free section can be estimated by the distance between the diamond wire machine installation and the slope of the ledge. Analytical dependences between the specified sizes are considered. The existence of the obtained dependences and the strength of the correlation connection was confirmed by experimental studies in the conditions of the block quarry of the facing stone. Scientific novelty. At first time, the relationship between the distance of the diamond wire machine installation and the side of the diamond wire and the length of the free section of the diamond edging, which allows to control the length of contact of the diamond wire with rock in the cut. The obtained dependence is analyzed and it is concluded that the geometric parameters of the ledge will affect the length of the cut only in the initial stages of separation of the block of natural stone from the array. In the next stages, the length of the free section of the diamond wire depends only on the distance of the location of the diamond wire machine installation and the side of the diamond rope. Practical significance. The value of the optimal initial distance of the diamond wire machine placement to the slope of the ledge is found. The empirical dependence of the length of the free section of the diamond wire on the location of the diamond wire machine is also obtained","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"51 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":"134131459","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-2020-2-118-126
D. Zaikina, T. N. M. Tugan-Baranovsky
The purpose of the work is to assess the scope of action of international environmental standards, focusing on existing gaps, including in the light of the parallel evolution of bilateral and multilateral international cooperation in the field of environmental protection. Research methods. An integrated approach is applied, including the logical generalization, collection, systematization and analysis of actual data; methods of system analysis. Results. In this article recent advances in international environmental law are summarized and provisions, concepts, analytical tools, and key issues used to achieve environmental goals are studied. The analysis was conducted by logical generalization and proved that application of international environmental law remains a topical issue both at the national and international levels. In many countries, national application is constrained by the lack of appropriate national legislation, financial resources, environmentally sound technologies and institutional capacity. National application can be improved by increasing the relevance of environmental considerations in other sectors and increasing participation of non-state actors in decision making and application. Scientific novelty consists in the author’s approach to determining the priority directions for optimizing the application of international law in the field of environmental protection, the use of regulatory combinations, economic, voluntary and informational instruments is required, while a set of policy measures is determined on the basis of available data on cost effectiveness. Practical significance is that scientific research clearly, accessibly and consistently demonstrates the imperative for complex regulatory regimes with more flexible and dynamic standards-setting processes, necessitating a pragmatic and forward-looking approach.
{"title":"INTERNATIONAL CO-OPERATION IN THE FIELD OF ENVIRONMENTAL PROTECTION: IMPLEMENTATION AND TRENDS ESTABLISHMENT IN UKRAINE","authors":"D. Zaikina, T. N. M. Tugan-Baranovsky","doi":"10.31474/1999-981X-2020-2-118-126","DOIUrl":"https://doi.org/10.31474/1999-981X-2020-2-118-126","url":null,"abstract":"The purpose of the work is to assess the scope of action of international environmental standards, focusing on existing gaps, including in the light of the parallel evolution of bilateral and multilateral international cooperation in the field of environmental protection. Research methods. An integrated approach is applied, including the logical generalization, collection, systematization and analysis of actual data; methods of system analysis. Results. In this article recent advances in international environmental law are summarized and provisions, concepts, analytical tools, and key issues used to achieve environmental goals are studied. The analysis was conducted by logical generalization and proved that application of international environmental law remains a topical issue both at the national and international levels. In many countries, national application is constrained by the lack of appropriate national legislation, financial resources, environmentally sound technologies and institutional capacity. National application can be improved by increasing the relevance of environmental considerations in other sectors and increasing participation of non-state actors in decision making and application. Scientific novelty consists in the author’s approach to determining the priority directions for optimizing the application of international law in the field of environmental protection, the use of regulatory combinations, economic, voluntary and informational instruments is required, while a set of policy measures is determined on the basis of available data on cost effectiveness. Practical significance is that scientific research clearly, accessibly and consistently demonstrates the imperative for complex regulatory regimes with more flexible and dynamic standards-setting processes, necessitating a pragmatic and forward-looking approach.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"7 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":"127873543","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-2022-1-158-165
O. Chernenko, Dmytro Fedorenko
Purpose. Determining the impact of the incidence of cadets and students on professional activities. Methods. The materials presented in the article are the result of sociological, hygienic and physiological research to assess the professional activities of cadets and students, their ability to work, functional status, physical development and health during training, as well as analysis of morbidity of conscripts and cadets and students. to medical and preventive institutions of SES. Results. As a result, the following was created: an algorithm for assessing a healthy lifestyle; a set of exercises to prevent visual fatigue; a set of physical exercises to relieve fatigue from extra-static stress; daytime memo; nutrition factors have been identified, long-term imbalance of which contributes to the development of diseases. Scientific novelty. The scientific substantiation of professional training and measures for the prevention of diseases of cadets and students of higher educational institutions of SES of Ukraine. Practical significance. The state of morbidity of cadets and students is analyzed, and the influence of morbidity on their professional activity is determined. Currently, there is a significant deterioration in the health of cadets and students, and the attention of the medical community and school leaders to the cadet student problem has decreased slightly, and therefore requires state support for the health care system of cadets and students. A comparative study of the health of cadets and students of different universities, despite conflicting views, showed that when entering the university cadets and students are forced to adapt to a set of new factors specific to higher educational establishments of the State Emergency Service. The health of cadet youth is the most urgent task for society and the state, in connection with which state support for the health care system of cadets and students is needed. Increasing requirements for the level of training, ever-increasing intensification of the educational process require increased attention to the health of cadets and students.
{"title":"THE INFLUENCE OF CADET AND STUDENT DISEASE INCIDENCE ON PREPARATION FOR PROFESSIONAL ACTIVITY","authors":"O. Chernenko, Dmytro Fedorenko","doi":"10.31474/1999-981x-2022-1-158-165","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-1-158-165","url":null,"abstract":"Purpose. Determining the impact of the incidence of cadets and students on professional activities. Methods. The materials presented in the article are the result of sociological, hygienic and physiological research to assess the professional activities of cadets and students, their ability to work, functional status, physical development and health during training, as well as analysis of morbidity of conscripts and cadets and students. to medical and preventive institutions of SES. Results. As a result, the following was created: an algorithm for assessing a healthy lifestyle; a set of exercises to prevent visual fatigue; a set of physical exercises to relieve fatigue from extra-static stress; daytime memo; nutrition factors have been identified, long-term imbalance of which contributes to the development of diseases. Scientific novelty. The scientific substantiation of professional training and measures for the prevention of diseases of cadets and students of higher educational institutions of SES of Ukraine. Practical significance. The state of morbidity of cadets and students is analyzed, and the influence of morbidity on their professional activity is determined. Currently, there is a significant deterioration in the health of cadets and students, and the attention of the medical community and school leaders to the cadet student problem has decreased slightly, and therefore requires state support for the health care system of cadets and students. A comparative study of the health of cadets and students of different universities, despite conflicting views, showed that when entering the university cadets and students are forced to adapt to a set of new factors specific to higher educational establishments of the State Emergency Service. The health of cadet youth is the most urgent task for society and the state, in connection with which state support for the health care system of cadets and students is needed. Increasing requirements for the level of training, ever-increasing intensification of the educational process require increased attention to the health of cadets and students.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"41 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":"131909891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. The objective of this study is to investigate the feasibility of using steel and composite reinforcement to enhance the strength characteristics of products made of natural stone. Methodology. The preparation of specimens for conducting strength tests is performed and described. Recommendations are provided for the preparation, configuration, and utilization of the main tools and materials involved in the research. The components of the experiment aimed at determining the strength characteristics of the specimens are developed and described. Based on the obtained data, calculations of the primary force parameters during the failure of the specimens under bending loads are carried out. Results. The research findings on the application of steel and composite reinforcement methods to improve the strength properties of stone products revealed that the use of composite reinforcement consistently increases deformation under higher loads, indicating better control of plastic deformation compared to steel reinforcement. However, the ultimate strength and load-bearing capacity of specimens reinforced with composite reinforcement are lower than those reinforced with steel reinforcement. Scientific novelty lies in the systematic analysis and comparison of the effectiveness of different types of reinforcement in enhancing the strength characteristics of products made of natural stone, as well as in the development of methodology and experimental procedures for determining force parameters. The obtained results indicate the potential of composite reinforcement for controlled plastic deformation and establish limitations regarding ultimate strength and load-bearing capacity. Practical significance of the research lies in providing recommendations and information that can be utilized by designers, engineers, and construction professionals in the manufacturing of products made of natural stone, as well as in the planning and implementation of construction projects involving natural stone.
{"title":"JUSTIFICATION OF REINFORCEMENT PARAMETERS FOR PRODUCTS MADE OF NATURAL STONE WITH STEEL AND COMPOSITE CORES","authors":"Kotenko Volodymyr, Ostafychuk Nelya, Piskun Ihor, Kunytska Maryna, Sydorenko Andriy","doi":"10.31474/1999-981x-2023-1-56-66","DOIUrl":"https://doi.org/10.31474/1999-981x-2023-1-56-66","url":null,"abstract":"Purpose. The objective of this study is to investigate the feasibility of using steel and composite reinforcement to enhance the strength characteristics of products made of natural stone.\u0000\u0000Methodology. The preparation of specimens for conducting strength tests is performed and described. Recommendations are provided for the preparation, configuration, and utilization of the main tools and materials involved in the research. The components of the experiment aimed at determining the strength characteristics of the specimens are developed and described. Based on the obtained data, calculations of the primary force parameters during the failure of the specimens under bending loads are carried out.\u0000\u0000Results. The research findings on the application of steel and composite reinforcement methods to improve the strength properties of stone products revealed that the use of composite reinforcement consistently increases deformation under higher loads, indicating better control of plastic deformation compared to steel reinforcement. However, the ultimate strength and load-bearing capacity of specimens reinforced with composite reinforcement are lower than those reinforced with steel reinforcement.\u0000\u0000Scientific novelty lies in the systematic analysis and comparison of the effectiveness of different types of reinforcement in enhancing the strength characteristics of products made of natural stone, as well as in the development of methodology and experimental procedures for determining force parameters. The obtained results indicate the potential of composite reinforcement for controlled plastic deformation and establish limitations regarding ultimate strength and load-bearing capacity.\u0000\u0000Practical significance of the research lies in providing recommendations and information that can be utilized by designers, engineers, and construction professionals in the manufacturing of products made of natural stone, as well as in the planning and implementation of construction projects involving natural stone.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"19 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":"129363469","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-2022-1-40-46
A. Kosenko, Viktor Tarasyutin
Purpose. Improving the efficiency and safety of mining operations in the process of preparatory-rifled risers, through the use of rational technological schemes of borehole hydraulic technology. Methods. Analysis of literary sources, design documentation and practice of developing mineral deposits by underground method. Designing a technological scheme for borehole hydraulic technology for preparatory-rifled risers. Technical and economic comparison of the developed technological schemes for conducting preparatory-rifled risers. Results. The results of the study were proposals for improving and increasing the efficiency of preparatory-rifled risers in the process of underground mining of rich iron ore deposits by using safe technological schemes of borehole hydraulic technology. The main areas of mining and geological conditions for the rational use of specific technologies for risers are determined. Scientific novelty. The dependences of the cost of carrying out 1 m3 of preparatory-rifled riser in different ways on its length are obtained. It has been established that for the effective destruction of low-strength martite ores by hydraulic monitors, the dynamic pressure of water jets should be 0.1–0.2 of the uniaxial compression strength of the massif. Practical implication. A technological scheme has been developed for conducting preparatory-rifled risers using borehole hydraulic technology, which allows for low-operation, flow and safety of mining operations, flexibility in controlling the concentration and volume of work, good compatibility with traditional mining technologies, as well as preliminary enrichment in the converter or open-hearth production of high-quality steel grades. Efficiency is ensured by the simplification of tunneling technology, high penetration rate, energy and material savings.
{"title":"SUBSTANTIATION OF RATIONAL TECHNOLOGIES FOR CARRYING OUT PREPARATORY-THROWED RAIS IN THE MINING BLOCKS OF IRON MINES, WHICH ENSURE INCREASED STABILITY OF THE MASSIF EXPOSURES","authors":"A. Kosenko, Viktor Tarasyutin","doi":"10.31474/1999-981x-2022-1-40-46","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-1-40-46","url":null,"abstract":"Purpose. Improving the efficiency and safety of mining operations in the process of preparatory-rifled risers, through the use of rational technological schemes of borehole hydraulic technology. Methods. Analysis of literary sources, design documentation and practice of developing mineral deposits by underground method. Designing a technological scheme for borehole hydraulic technology for preparatory-rifled risers. Technical and economic comparison of the developed technological schemes for conducting preparatory-rifled risers. Results. The results of the study were proposals for improving and increasing the efficiency of preparatory-rifled risers in the process of underground mining of rich iron ore deposits by using safe technological schemes of borehole hydraulic technology. The main areas of mining and geological conditions for the rational use of specific technologies for risers are determined. Scientific novelty. The dependences of the cost of carrying out 1 m3 of preparatory-rifled riser in different ways on its length are obtained. It has been established that for the effective destruction of low-strength martite ores by hydraulic monitors, the dynamic pressure of water jets should be 0.1–0.2 of the uniaxial compression strength of the massif. Practical implication. A technological scheme has been developed for conducting preparatory-rifled risers using borehole hydraulic technology, which allows for low-operation, flow and safety of mining operations, flexibility in controlling the concentration and volume of work, good compatibility with traditional mining technologies, as well as preliminary enrichment in the converter or open-hearth production of high-quality steel grades. Efficiency is ensured by the simplification of tunneling technology, high penetration rate, energy and material savings.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"67 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":"132092783","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-2021-1-37-48
S. Vlasov, Yavhen Moldavanov
Purpose. To substantiate the parameters of computer modeling of the mining area with a step-by-step movement of the working face, as well as taking into account the changing presence of sandstones that lie in the top of the reservoir, to predict the effect of sandstones on the nature of the distribution of convergence in the longwall and the technology of working excavation in the conditions of the mines of Western Donbass. Methods. The work uses a statistical analysis of the geological and technological conditions that are inherent in the coal mining enterprises of the Western Donbass. Also, a comparison was made of the parameters of the experiment of computer modeling of past studies, on the basis of which, a combination of new features was introduced and changed, which is aimed at choosing the optimal modeling parameters. Results. The substantiation of the parameters of the modeling experiment is presented, such as: the choice of the length of the working face, the depth of development of coal seams, the distance of the working face withdrawal from the assembly chamber, the values of the thickness of sandstones that lie in the roof of the coal seams, the choice of values of the distance of occurrence of sandstones above the roof of the coal seam, as well as geometric parameters of the computer model. Based on the justification of the parameters, a plan for conducting experiments was drawn up, the number of which was 225 units. Scientific novelty. As a result of the substantiation of the parameters, an additional combination of new features in existing studies was proposed for the first time, namely, to include in the experiment the presence of coal seams in the top – sandstones with variable thickness, the distance of occurrence above the seam, several standard sizes of the length of the working face were also included, the value of the development depth, the distance of the exit of the working face from the assembly chamber. Changing the above parameters will make it possible to compare the difference in the effect of the results of each experiment separately, depending on the change in each of the parameters, as well as to understand and generalize the idea of the nature and causes of emergency longwall stops associated with the landing of powered support sections “on a hard base”. Practical significance. Substantiated modeling parameters make it possible to most adequately reflect the processes occurring in the rock mass, as well as to clarify the parameters of the reference rock pressure zones, unloading zones, as well as the nature of the change in the distribution of convergence in the longwall. The data obtained as a result of modeling can be used to select and substantiate an effective method for managing the state of the rock mass around the working excavation, which will eliminate the planting of powered support sections “on a hard base”, thereby increasing the efficiency of coal mining in the Western Donbass.
{"title":"SUBSTANTIATION OF PARAMETERS OF THE EXPERIMENT WITH THREE-DIMENSIONAL COMPUTER MODELING OF THE ROCK MASS AROUND A LONGWALL","authors":"S. Vlasov, Yavhen Moldavanov","doi":"10.31474/1999-981x-2021-1-37-48","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-1-37-48","url":null,"abstract":"Purpose. To substantiate the parameters of computer modeling of the mining area with a step-by-step movement of the working face, as well as taking into account the changing presence of sandstones that lie in the top of the reservoir, to predict the effect of sandstones on the nature of the distribution of convergence in the longwall and the technology of working excavation in the conditions of the mines of Western Donbass. Methods. The work uses a statistical analysis of the geological and technological conditions that are inherent in the coal mining enterprises of the Western Donbass. Also, a comparison was made of the parameters of the experiment of computer modeling of past studies, on the basis of which, a combination of new features was introduced and changed, which is aimed at choosing the optimal modeling parameters. Results. The substantiation of the parameters of the modeling experiment is presented, such as: the choice of the length of the working face, the depth of development of coal seams, the distance of the working face withdrawal from the assembly chamber, the values of the thickness of sandstones that lie in the roof of the coal seams, the choice of values of the distance of occurrence of sandstones above the roof of the coal seam, as well as geometric parameters of the computer model. Based on the justification of the parameters, a plan for conducting experiments was drawn up, the number of which was 225 units. Scientific novelty. As a result of the substantiation of the parameters, an additional combination of new features in existing studies was proposed for the first time, namely, to include in the experiment the presence of coal seams in the top – sandstones with variable thickness, the distance of occurrence above the seam, several standard sizes of the length of the working face were also included, the value of the development depth, the distance of the exit of the working face from the assembly chamber. Changing the above parameters will make it possible to compare the difference in the effect of the results of each experiment separately, depending on the change in each of the parameters, as well as to understand and generalize the idea of the nature and causes of emergency longwall stops associated with the landing of powered support sections “on a hard base”. Practical significance. Substantiated modeling parameters make it possible to most adequately reflect the processes occurring in the rock mass, as well as to clarify the parameters of the reference rock pressure zones, unloading zones, as well as the nature of the change in the distribution of convergence in the longwall. The data obtained as a result of modeling can be used to select and substantiate an effective method for managing the state of the rock mass around the working excavation, which will eliminate the planting of powered support sections “on a hard base”, thereby increasing the efficiency of coal mining in the Western Donbass.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"76 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":"131166278","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-2021-1-64-74
Leonid L. Bachurin, I. Iordanov, O. Kohtieva, V. Dovgal, H. Boichenko, Yaroslava Bachurina, I. Buleha, O. Yefremov, M. Hryhorets
Purpose. Evaluate the stability of the rocks surrounding the roadways in a coal-rock stratum, taking into account the deformation characteristics of supporting structures. Methodology. To achieve this goal laboratory study of the deformation characteristics of supporting structures located between the simulated roof and floor of the coal seam under uniaxial compression was performed. Results. This study demonstrates that the deformation characteristics of secondary support structures affect the stability of roadway surrounding rocks in a coal-rock stratum. The nature of the deformation of supporting structures under the action of external forces is specified by their stiffness. All other things being equal, when the roof and floor rocks have a constant flexural rigidity, their stability depends on the stiffness of the supporting structures and the direction of the load applied in the tangential (wooden crib supports: 4-point chock, sandwich chock) or radial (vertical timber sets) direction. For the simulated supporting structures with an increase in the compressive load was recorded a simultaneous linear increase in their stiffness and deformation modulus. Moreover, for wooden yielding crib supports, when the load is applying across the wood fibres, the compressed chocks of wooden cribs are compacted, because of which the roof-to-floor convergence is limited. There is no such pattern for rigid structures in the form of vertical timber sets. After the loss of stability of the supporting structure, the deformation modulus decreases, which is accompanied by an increase in the roof-to-floor convergence to the destruction of the construction. It is recommended to refuse to use rigid and fragile secondary support structures. Novelty. The roadways roof stability in the coal-rock stratum is estimated by the maximum relative deformation of the secondary support structures under uniaxial compression using a coefficient characterizing the ratio of the stiffness of the working supporting structure to flexural rigidity of the roof and floor strata. Practical significance. It is necessary to focus on the use of yielding supporting structures to ensure the stability of the immediate roof and floor of mine workings in the coal-rock stratum and the operational condition of the gateroads adjacent to the working face at the extraction site of the coal mine.
{"title":"Estimation of stability of roadways surrounding rocks in a coal-rock stratum considering a deformation characteristics of secondary support structures","authors":"Leonid L. Bachurin, I. Iordanov, O. Kohtieva, V. Dovgal, H. Boichenko, Yaroslava Bachurina, I. Buleha, O. Yefremov, M. Hryhorets","doi":"10.31474/1999-981x-2021-1-64-74","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-1-64-74","url":null,"abstract":"Purpose. Evaluate the stability of the rocks surrounding the roadways in a coal-rock stratum, taking into account the deformation characteristics of supporting structures. Methodology. To achieve this goal laboratory study of the deformation characteristics of supporting structures located between the simulated roof and floor of the coal seam under uniaxial compression was performed. Results. This study demonstrates that the deformation characteristics of secondary support structures affect the stability of roadway surrounding rocks in a coal-rock stratum. The nature of the deformation of supporting structures under the action of external forces is specified by their stiffness. All other things being equal, when the roof and floor rocks have a constant flexural rigidity, their stability depends on the stiffness of the supporting structures and the direction of the load applied in the tangential (wooden crib supports: 4-point chock, sandwich chock) or radial (vertical timber sets) direction. For the simulated supporting structures with an increase in the compressive load was recorded a simultaneous linear increase in their stiffness and deformation modulus. Moreover, for wooden yielding crib supports, when the load is applying across the wood fibres, the compressed chocks of wooden cribs are compacted, because of which the roof-to-floor convergence is limited. There is no such pattern for rigid structures in the form of vertical timber sets. After the loss of stability of the supporting structure, the deformation modulus decreases, which is accompanied by an increase in the roof-to-floor convergence to the destruction of the construction. It is recommended to refuse to use rigid and fragile secondary support structures. Novelty. The roadways roof stability in the coal-rock stratum is estimated by the maximum relative deformation of the secondary support structures under uniaxial compression using a coefficient characterizing the ratio of the stiffness of the working supporting structure to flexural rigidity of the roof and floor strata. Practical significance. It is necessary to focus on the use of yielding supporting structures to ensure the stability of the immediate roof and floor of mine workings in the coal-rock stratum and the operational condition of the gateroads adjacent to the working face at the extraction site of the coal mine.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"30 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":"121187390","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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