Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2021-2-124-134
I. Liashok, S. Podkopaiev, Y. Simonova, H. Boichenko, V. Dovhal, O. Tkachuk
Purpose. To assess the production risk of rock collapse in a deep coal mine to identify hazards in the workplaces of the excavation site, taking into account different methods of protection of workings. Methods. A comprehensive approach was used, which included: analysis and generalization of known research; expert evaluation; use of the basic provisions of probability theory and set algebra (Venn diagrams), the method of estimating the production risk of Fine-Kinney; processing, analysis and interpretation of the obtained results. Results. Problems and sources of industrial risk from rock collapses during maintenance of workings, risk-forming factors that contribute to the threat of dangerous events at the excavation site are analyzed. The decision-making model is considered, which is based on the description of situations when the production risk of the dangerous factor “landslides and collapses” in the maintenance of preparatory workings depends on the result of choosing an alternative method of protection of the retractable lane. For excavation sites under the same mining and geological conditions for all workplaces, the probability of receiving consequences from dangerous events due to uncertain conditions of their implementation has been established. It is fixed that the realization of this production risk is influenced by low reliability and inefficiency of the practiced methods of protection of excavations. Risk analysis is defined as the systematic use of available information to identify hazards in the maintenance of long workings. Novelty. A model for monitoring the production risk of rock collapses in excavations of deep coal mines is proposed, which allows assessing the dynamics of the threat at the stage of technical decisions related to the choice and justification of the method of protection of workings taking into account the interaction of risk factors. Practical significance. When formulating measures to reduce the risk of dangerous events at the excavation site, it is necessary to take into account that the production risk of rock collapse while maintaining the workings depends largely on the method of protection and effectiveness of technological measures.
{"title":"ANALYSIS OF PRODUCTION RISK FROM CRUSHES OF ROCKS AT EXCAVATION SITES, TAKING INTO ACCOUNT WAYS OF PROTECTION","authors":"I. Liashok, S. Podkopaiev, Y. Simonova, H. Boichenko, V. Dovhal, O. Tkachuk","doi":"10.31474/1999-981x-2021-2-124-134","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-2-124-134","url":null,"abstract":"Purpose. To assess the production risk of rock collapse in a deep coal mine to identify hazards in the workplaces of the excavation site, taking into account different methods of protection of workings. Methods. A comprehensive approach was used, which included: analysis and generalization of known research; expert evaluation; use of the basic provisions of probability theory and set algebra (Venn diagrams), the method of estimating the production risk of Fine-Kinney; processing, analysis and interpretation of the obtained results. Results. Problems and sources of industrial risk from rock collapses during maintenance of workings, risk-forming factors that contribute to the threat of dangerous events at the excavation site are analyzed. The decision-making model is considered, which is based on the description of situations when the production risk of the dangerous factor “landslides and collapses” in the maintenance of preparatory workings depends on the result of choosing an alternative method of protection of the retractable lane. For excavation sites under the same mining and geological conditions for all workplaces, the probability of receiving consequences from dangerous events due to uncertain conditions of their implementation has been established. It is fixed that the realization of this production risk is influenced by low reliability and inefficiency of the practiced methods of protection of excavations. Risk analysis is defined as the systematic use of available information to identify hazards in the maintenance of long workings. Novelty. A model for monitoring the production risk of rock collapses in excavations of deep coal mines is proposed, which allows assessing the dynamics of the threat at the stage of technical decisions related to the choice and justification of the method of protection of workings taking into account the interaction of risk factors. Practical significance. When formulating measures to reduce the risk of dangerous events at the excavation site, it is necessary to take into account that the production risk of rock collapse while maintaining the workings depends largely on the method of protection and effectiveness of technological measures.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"28 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":"115122540","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}
Objective: to analyze working conditions and safety of miners involved in mining excavations by drilling and blasting and to develop modern schemes and technical solutions to improve their standards. Methodology: comprehensive and detailed analytical studies of the current problems connected with occupational health and safety of personnel working specifically in lifting mine excavations of different purposes were carried out, on the basis of which the key tasks for their practical solution were defined. Results: The preliminary analysis and analytical studies have determined that the main and most acute problems requiring an urgent solution are connected with the ventilation of mine workings, and the need to improve the means of sampling and express-control of the quality of air from the bottom-hole zone of mines. According to the state standard “System of product development and launching into manufacture” (“DSTU 3974-2000”) the fundamentally new integral system of schemes and technical solutions (having no analogs) was developed. The system allows for efficiently and reliably solving the extremely complicated issues of ventilation, dust and gas removal, air quality sampling, and control (express analysis) of air composition in drilling and blasting mining excavations of different purposes (ore mining, ventilation, material-entry) to the height of 80-100 m. The developed equipment includes a multipurpose high-pressure ejector-type automatic dust collector ADC-1, designed for efficient ventilation of lifting workings and providing normal sanitary and hygienic working conditions for tunnelers while performing their work cycle, and for reliable neutralization of explosion products; the modernized device for remote control of air composition RCAC-20/80 ore-welding ventilation and material-entry from the bottom-hole zone of the lifting excavations. This process can be carried out both with the use of standard special indicator tubes with chemical reagents and with the use of modern electronic gas-measuring apparatuses (“Dräger-2500/5000” made in Germany or their analogs). Scientific novelty: the integration, i.e. bringing into a single system, of developed up-to-date technical solutions for effective ventilation, reliable dust and gas extraction, gas removal, and air quality sampling and control of air composition of the lifting workings by the drilling and blasting method.
{"title":"VENTING, REMOTE AIR SAMPLING AND MONITORING OF AIR QUALITY IN BLASTED MINING EXCAVATIONS: CURRENT PROBLEMS AND SOLUTIONS","authors":"Riasnyi Vitaliy, Yevstratenko Ihor, Kostiantyn Humenok, Yevstratenko Liliia, Chukharev Serhii, Zaiets Vitalii","doi":"10.31474/1999-981x-2023-1-74-85","DOIUrl":"https://doi.org/10.31474/1999-981x-2023-1-74-85","url":null,"abstract":"Objective: to analyze working conditions and safety of miners involved in mining excavations by drilling and blasting and to develop modern schemes and technical solutions to improve their standards.\u0000\u0000Methodology: comprehensive and detailed analytical studies of the current problems connected with occupational health and safety of personnel working specifically in lifting mine excavations of different purposes were carried out, on the basis of which the key tasks for their practical solution were defined.\u0000\u0000Results: The preliminary analysis and analytical studies have determined that the main and most acute problems requiring an urgent solution are connected with the ventilation of mine workings, and the need to improve the means of sampling and express-control of the quality of air from the bottom-hole zone of mines. According to the state standard “System of product development and launching into manufacture” (“DSTU 3974-2000”) the fundamentally new integral system of schemes and technical solutions (having no analogs) was developed. The system allows for efficiently and reliably solving the extremely complicated issues of ventilation, dust and gas removal, air quality sampling, and control (express analysis) of air composition in drilling and blasting mining excavations of different purposes (ore mining, ventilation, material-entry) to the height of 80-100 m. The developed equipment includes a multipurpose high-pressure ejector-type automatic dust collector ADC-1, designed for efficient ventilation of lifting workings and providing normal sanitary and hygienic working conditions for tunnelers while performing their work cycle, and for reliable neutralization of explosion products; the modernized device for remote control of air composition RCAC-20/80 ore-welding ventilation and material-entry from the bottom-hole zone of the lifting excavations. This process can be carried out both with the use of standard special indicator tubes with chemical reagents and with the use of modern electronic gas-measuring apparatuses (“Dräger-2500/5000” made in Germany or their analogs). \u0000\u0000Scientific novelty: the integration, i.e. bringing into a single system, of developed up-to-date technical solutions for effective ventilation, reliable dust and gas extraction, gas removal, and air quality sampling and control of air composition of the lifting workings by the drilling and blasting method.","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":"115419299","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-2022-1-16-31
Serhiy Volkov, Y. Simonova, A. Korol, Yevgen Podkopayev, O. Kayun, O. Tkachuk
Purpose. Structuring of experimental data of mine observations of the performance of arched flexible supports to establish a probabilistic assessment of the state of haulage drifts of steep coal seams in the excavation areas of a coal mine. Methods. The methodological basis of the research is an integrated approach, including the analysis and generalization of scientific achievements on the problem under study; mine observations of the state of development workings; analytical calculations using the basic provisions of probability theory, mathematical statistics using differential equations. Results. A probabilistic assessment of the state of the haulage drift under different protection methods, used to predict the stability of section development workings, was obtained from the experimental data of mine observations (observation time t = 4280 hours) of the performance of the arched pliable lining installed in the working along the length of the excavation section. After the sample was formed, the calculation of a statistical assessment of the reliability of the support operation was performed: the indicators of the failure rate λ and the recovery rate μ were established. Dependencies are obtained that allow assessing the state of development workings along the length of the excavation section and in the zone of influence of the stopping operations. It is proved that in the steady mode of operation of the haulage drift, with an increase in the failure rate of the arch support by 5 times, the availability factor, as a function of the reliability and maintainability of the support, changes from 0.9 to 0.5, which leads to a deterioration in time, approximately by 60 %, operational characteristics of the support in the supported development. Novelty. The probabilistic assessment of the loss of stability of the haulage drift along the length of the excavation section is based on the structuring of the data on the performance of arched supports and depends on the method of protection of the working, the intensity of failures of the arched supple support and the frequency of its damage, when in the desired interval of observations when forming the sample, the position of the stopping front is taken into account. Practical relevance. For the reuse of development workings with a store method of preparing steep seams and a descending order of mining floors, a conceptual model is proposed that allows predicting the state of haulage drifts along the length of the excavation area, taking into account the method of protection.
{"title":"STRUCTURING EXPERIMENTAL DATA ON THE PERFORMANCE OF ARCH SUPPORTS FOR PROBABILISTIC ASSESSMENT OF THE STATE OF RETRACTABLE DRIFTS","authors":"Serhiy Volkov, Y. Simonova, A. Korol, Yevgen Podkopayev, O. Kayun, O. Tkachuk","doi":"10.31474/1999-981x-2022-1-16-31","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-1-16-31","url":null,"abstract":"Purpose. Structuring of experimental data of mine observations of the performance of arched flexible supports to establish a probabilistic assessment of the state of haulage drifts of steep coal seams in the excavation areas of a coal mine. Methods. The methodological basis of the research is an integrated approach, including the analysis and generalization of scientific achievements on the problem under study; mine observations of the state of development workings; analytical calculations using the basic provisions of probability theory, mathematical statistics using differential equations. Results. A probabilistic assessment of the state of the haulage drift under different protection methods, used to predict the stability of section development workings, was obtained from the experimental data of mine observations (observation time t = 4280 hours) of the performance of the arched pliable lining installed in the working along the length of the excavation section. After the sample was formed, the calculation of a statistical assessment of the reliability of the support operation was performed: the indicators of the failure rate λ and the recovery rate μ were established. Dependencies are obtained that allow assessing the state of development workings along the length of the excavation section and in the zone of influence of the stopping operations. It is proved that in the steady mode of operation of the haulage drift, with an increase in the failure rate of the arch support by 5 times, the availability factor, as a function of the reliability and maintainability of the support, changes from 0.9 to 0.5, which leads to a deterioration in time, approximately by 60 %, operational characteristics of the support in the supported development. Novelty. The probabilistic assessment of the loss of stability of the haulage drift along the length of the excavation section is based on the structuring of the data on the performance of arched supports and depends on the method of protection of the working, the intensity of failures of the arched supple support and the frequency of its damage, when in the desired interval of observations when forming the sample, the position of the stopping front is taken into account. Practical relevance. For the reuse of development workings with a store method of preparing steep seams and a descending order of mining floors, a conceptual model is proposed that allows predicting the state of haulage drifts along the length of the excavation area, taking into account the method of protection.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"5 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":"121813943","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-2020-2-49-57
A. Merzlikin, Oleksandr Yaytsov, Olga Pidgurnaya, V. Nazimko
Purpose. Investigation of deformation of the mouth of the degassing well depending on the deformation of the rocks around the preparatory work Methodology. The deformation of the mouth of the degassing well as a function of deformations of the roof rocks of the preparatory workings from which the well was drilled is considered. The dependence of the required depth of well sealing on the level of methane leakage and roof deformation is established. Results. It is experimentally proved that in the zone of active shifts behind the operating lava, where the main amount of explosive methane is released from the massif, the mouths of degassing wells change and the main types of irreversible deformations take place. With the distance from the contour of the preparatory production, the distance between adjacent concentrated deformations of the wellbore increases according to the logarithmic dependence, and these deformations are distributed according to the normal law. The average value of the concentrated deformation of the degassing well is in logarithmic dependence on the displacements on the contour of the preparatory work. The tensile deformation of the degassing well axis decreases with distance from the production contour into the array. Stratification of rocks leads to gas leakage and air suction, which reduces the efficiency of degassing. Permissible concentrated deformations of the degassing wellbore should not exceed its radius. Originality. The empirical power dependence of the required length of sealing of the degassing well on the allowable leaks and displacements of the roof of the preparatory workings from which the well was drilled is established. Practical value. Methods for calculating the required sealing depth of the degassing well have been developed and measures have been proposed to increase its stability, which increase the reliability of the degassing system as a whole and help increase the safety of underground coal mining.
{"title":"RESEARCH OF DEFORMATIONS AND OPTIMIZATION OF PARAMETERS OF DEGASATION WELLS","authors":"A. Merzlikin, Oleksandr Yaytsov, Olga Pidgurnaya, V. Nazimko","doi":"10.31474/1999-981X-2020-2-49-57","DOIUrl":"https://doi.org/10.31474/1999-981X-2020-2-49-57","url":null,"abstract":"Purpose. Investigation of deformation of the mouth of the degassing well depending on the deformation of the rocks around the preparatory work Methodology. The deformation of the mouth of the degassing well as a function of deformations of the roof rocks of the preparatory workings from which the well was drilled is considered. The dependence of the required depth of well sealing on the level of methane leakage and roof deformation is established. Results. It is experimentally proved that in the zone of active shifts behind the operating lava, where the main amount of explosive methane is released from the massif, the mouths of degassing wells change and the main types of irreversible deformations take place. With the distance from the contour of the preparatory production, the distance between adjacent concentrated deformations of the wellbore increases according to the logarithmic dependence, and these deformations are distributed according to the normal law. The average value of the concentrated deformation of the degassing well is in logarithmic dependence on the displacements on the contour of the preparatory work. The tensile deformation of the degassing well axis decreases with distance from the production contour into the array. Stratification of rocks leads to gas leakage and air suction, which reduces the efficiency of degassing. Permissible concentrated deformations of the degassing wellbore should not exceed its radius. Originality. The empirical power dependence of the required length of sealing of the degassing well on the allowable leaks and displacements of the roof of the preparatory workings from which the well was drilled is established. Practical value. Methods for calculating the required sealing depth of the degassing well have been developed and measures have been proposed to increase its stability, which increase the reliability of the degassing system as a whole and help increase the safety of underground coal mining.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"45 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":"121125134","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-2020-2-23-32
V. Vasylkivskyi, L. Stefanovich, O. Chesnokova
Goal. To study the effect of natural internal moisture content on the kinetics of methane desorption from coals of varying degrees of metamorphization. Methodology. For the research, coal was used after a long (more than 100 days) preliminary exposure in a dry, closed indoors. The measurements were carried out on several samples of Donbass coals with different volatile content. Two groups of coal samples were used - dry, with natural internal humidity and one sample with artificial humidity of 1.5%. The volumetric method was used for measurements. The method includes three stages: 1st saturation of coal with compressed methane, 2nd preliminary discharge of compressed gas from a container with coal after its saturation, and 3rd collection of methane released by coal into a storage vessel. Before registration of desorption, pressurized gas was discharged from the free volume of containers into the atmosphere. The desorption unit contains a low-temperature trap (78°C) for water vapor and a warming radiator for methane entering the storage vessel. To determine the numerical values of the characteristic time of desorption of methane from coal, we used information on the change in gas pressure in the storage vessel during desorption. To analyze the results, a method based on the concept of a change in the characteristic relaxation time of desorption during methane emission was used. Results. Experimental results show that in wet coals the ratio between the amount of methane in coal and the intensity of its outflow at any desorption site is less than in dry coals. It was found that in coals of the metamorphic series the presence of natural moisture leads to a decrease in the intensity of methane emission, a decrease in the characteristic desorption time and a decrease in the activation energy of methane desorption by 0.4 - 2.5 kJ / mol. The features of the kinetics of desorption indicates competition energetics of interactions between methane and water with the surface of the pores of coal. Scientific novelty. It was found that even without artificial humidification, but in the presence of natural internal moisture in coal, the degassing time during desorption is reduced (in comparison with dry coal). Practical significance. The research results can be used to optimize the duration of hydraulic saturation of the coal seam and the water consumption during coal degassing.
{"title":"INFLUENCE OF NATURAL MOISTURE ON THE CHARACTERISTIC TIME OF METHANE DESORPTION FROM COALS OF VARIOUS DEGREES OF METAMORPHISM","authors":"V. Vasylkivskyi, L. Stefanovich, O. Chesnokova","doi":"10.31474/1999-981X-2020-2-23-32","DOIUrl":"https://doi.org/10.31474/1999-981X-2020-2-23-32","url":null,"abstract":"Goal. To study the effect of natural internal moisture content on the kinetics of methane desorption from coals of varying degrees of metamorphization. Methodology. For the research, coal was used after a long (more than 100 days) preliminary exposure in a dry, closed indoors. The measurements were carried out on several samples of Donbass coals with different volatile content. Two groups of coal samples were used - dry, with natural internal humidity and one sample with artificial humidity of 1.5%. The volumetric method was used for measurements. The method includes three stages: 1st saturation of coal with compressed methane, 2nd preliminary discharge of compressed gas from a container with coal after its saturation, and 3rd collection of methane released by coal into a storage vessel. Before registration of desorption, pressurized gas was discharged from the free volume of containers into the atmosphere. The desorption unit contains a low-temperature trap (78°C) for water vapor and a warming radiator for methane entering the storage vessel. To determine the numerical values of the characteristic time of desorption of methane from coal, we used information on the change in gas pressure in the storage vessel during desorption. To analyze the results, a method based on the concept of a change in the characteristic relaxation time of desorption during methane emission was used. Results. Experimental results show that in wet coals the ratio between the amount of methane in coal and the intensity of its outflow at any desorption site is less than in dry coals. It was found that in coals of the metamorphic series the presence of natural moisture leads to a decrease in the intensity of methane emission, a decrease in the characteristic desorption time and a decrease in the activation energy of methane desorption by 0.4 - 2.5 kJ / mol. The features of the kinetics of desorption indicates competition energetics of interactions between methane and water with the surface of the pores of coal. Scientific novelty. It was found that even without artificial humidification, but in the presence of natural internal moisture in coal, the degassing time during desorption is reduced (in comparison with dry coal). Practical significance. The research results can be used to optimize the duration of hydraulic saturation of the coal seam and the water consumption during coal degassing.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"24 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":"116595530","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-2019-1-7-22
S. Podkopaev, V. Gogo, I. Efremov, I. Iordanov, A. Nosach, Y. Simonova
{"title":"MODELING OF THE STABILITY OF THE ROOF OF A COBAL PLATE WITH A SUPPRESSIVE SUPPORT OF VARIOUS HARDNESS","authors":"S. Podkopaev, V. Gogo, I. Efremov, I. Iordanov, A. Nosach, Y. Simonova","doi":"10.31474/1999-981X-2019-1-7-22","DOIUrl":"https://doi.org/10.31474/1999-981X-2019-1-7-22","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"79 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":"128381221","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-2021-2-135-148
Y. Rudniev, V. Galchenko, E. Filatieva, M. Antoshchenko
Purpose: to establish a quantitative effect on the dust-generating ability of mine layers of the degree of metamorphic transformations of fossil coals, mining-geological and mining conditions of mining operations and to provide proposals for the development of a general methodology for predicting other hazardous properties of mine layers. Methodology: research is based on the experience of using regulatory documents and analysis of the results of experimental and calculated data on dust formation of fine fractions for various observation conditions. Results: based on the analysis of statistical models of shallow and steeply dipping mine layers by groups of their dustiness, the effect of specific dust release, dust content in broken coal, moisture and thickness of the seams was established. Of all the possible factors that determine the specific dust release, the main ones are the design features of mining machines. The yield of small grades when tested by the falling weight method can serve as an indicator of the strength of coal. The use of such methods eliminates the errors caused by determining the degree of coal change during the transition from its actual destruction by a coal mining machine to the reference mode. The use of carbon content as one of the main indicators of the degree of metamorphism makes it possible to analyze the level of influence of both the sum of the remaining main components of the organic mass (hydrogen, nitrogen, sulfur, oxygen) and their separate influence. In order to bring the state of coal as close as possible to production conditions, it is necessary to additionally take into account moisture, mineral inclusions and their composition. The petrographic composition and some physical and mechanical properties are reliably characterized by the vitrinite reflectance index. The extreme limits of influence on dust formation of the design features of mass-produced combines differ by 43.4 times. The influence of metamorphic transformations at the extreme limits of the yield of the 1-0 mm class when testing coals in a pile driver is estimated by a difference of 5.6 times. The release of volatile substances taken as the main indicator of the degree of metamorphism in the normative base for the safe conduct of mining operations does not unambiguously characterize the gradation of mine layers according to their dustiness groups. The thickness of the mines being developed and the angles of occurrence do not determine their tendency to dust formation, but are the main criteria for choosing mining equipment for crushing coal in the massif. The general methodology for predicting the hazardous properties of coal mine layers, using the example of their dust-forming ability, should take into account the influence of factors of three blocks – metamorphic transformations, mining and geological and mining technical conditions. Scientific novelty: for the first time, a quantitative assessment of the effect on the dust-generating capaci
{"title":"ON THE DEVELOPMENT OF A GENERAL METHOD FOR FORECASTING THE DANGEROUS PROPERTIES OF COAL SEAMS","authors":"Y. Rudniev, V. Galchenko, E. Filatieva, M. Antoshchenko","doi":"10.31474/1999-981x-2021-2-135-148","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-2-135-148","url":null,"abstract":"Purpose: to establish a quantitative effect on the dust-generating ability of mine layers of the degree of metamorphic transformations of fossil coals, mining-geological and mining conditions of mining operations and to provide proposals for the development of a general methodology for predicting other hazardous properties of mine layers. Methodology: research is based on the experience of using regulatory documents and analysis of the results of experimental and calculated data on dust formation of fine fractions for various observation conditions. Results: based on the analysis of statistical models of shallow and steeply dipping mine layers by groups of their dustiness, the effect of specific dust release, dust content in broken coal, moisture and thickness of the seams was established. Of all the possible factors that determine the specific dust release, the main ones are the design features of mining machines. The yield of small grades when tested by the falling weight method can serve as an indicator of the strength of coal. The use of such methods eliminates the errors caused by determining the degree of coal change during the transition from its actual destruction by a coal mining machine to the reference mode. The use of carbon content as one of the main indicators of the degree of metamorphism makes it possible to analyze the level of influence of both the sum of the remaining main components of the organic mass (hydrogen, nitrogen, sulfur, oxygen) and their separate influence. In order to bring the state of coal as close as possible to production conditions, it is necessary to additionally take into account moisture, mineral inclusions and their composition. The petrographic composition and some physical and mechanical properties are reliably characterized by the vitrinite reflectance index. The extreme limits of influence on dust formation of the design features of mass-produced combines differ by 43.4 times. The influence of metamorphic transformations at the extreme limits of the yield of the 1-0 mm class when testing coals in a pile driver is estimated by a difference of 5.6 times. The release of volatile substances taken as the main indicator of the degree of metamorphism in the normative base for the safe conduct of mining operations does not unambiguously characterize the gradation of mine layers according to their dustiness groups. The thickness of the mines being developed and the angles of occurrence do not determine their tendency to dust formation, but are the main criteria for choosing mining equipment for crushing coal in the massif. The general methodology for predicting the hazardous properties of coal mine layers, using the example of their dust-forming ability, should take into account the influence of factors of three blocks – metamorphic transformations, mining and geological and mining technical conditions. Scientific novelty: for the first time, a quantitative assessment of the effect on the dust-generating capaci","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"111 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":"123322550","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-2019-1-116-126
V. Hrinov, A. Khorolskyi, O. Mamaikin
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Pub Date : 1900-01-01DOI: 10.31474/1999-981x-2022-1-132-145
Y. Rudniev, M. Antoshchenko, E. Filatieva, M. Filatiev
Purpose: to develop a method of coal gradation to predict the hazardous properties of coal seams during mining. Methodology: based on the study of the interdependence between indicators of the degree of coal metamorphism, which characterize various aspects of its transformation in geological processes. Results: the dependence of the manifestation of any dangerous property of coal seams during mining operations on the influencing factors of the three blocks is considered. In the general case, the most dangerous properties of coal seams include the release of explosive and flammable gases, sudden emissions of coal and gas, the tendency to spontaneous combustion and the occurrence of endogenous fires, increased dust formation, explosiveness of coal dust and other negative phenomena. To prevent emergencies during mining operations, it is necessary to take into account the influence of factors of all three units. Factors of the first block determine the genetic predisposition of mine shafts to the appearance of dangerous properties under the influence of geological processes and metamorphic transformation of the source material. The factors of the second block include mining and geological conditions of coal seams. On the basis of data on parameters of the first two blocks at stages of designing and operation of the coal enterprise, mining indicators of the third block of factors are put. In contrast to the mining-geological and mining conditions of the second block, the factors of the first block are the least studied and not always reliably established. They must determine under the influence of metamorphism changes in the chemical composition, structure and physical properties of coal in the bowels of the Earth, mainly under the influence of elevated temperature and pressure. Currently, more than thirty factors are known, which in different ways characterise the metamorphic transformations of the starting material. There is a practice when in normative documents for the characteristic of degree of metamorphic transformations of layers in the vast majority of cases one indicator is used – an exit of volatile substances at thermal decomposition of coal without access to air. One indicator can not simultaneously and on all sides characterise the content, structure, chemical and physical and mechanical properties of the organic mass of coal and mineral impurities. It is necessary to proceed from the position that each dangerous property of mine layers depends on a certain influence of several factors of metamorphism. Studies have shown that the carbon content directly controls the overall change in the sum of the main components of organic matter (hydrogen, nitrogen, sulphur, oxygen), and the reflection rate of vitrinite – reflects structural changes in petrographic composition. The chemical activity of coal is also affected by the presence of moisture in different states, composition and properties of mineral impurities. The use of each auxiliary indi
{"title":"SCIENTIFIC BASIS FOR THE DEVELOPMENT OF A METHOD FOR FORECASTING THE HAZARDOUS PROPERTIES OF COAL SEAMS","authors":"Y. Rudniev, M. Antoshchenko, E. Filatieva, M. Filatiev","doi":"10.31474/1999-981x-2022-1-132-145","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-1-132-145","url":null,"abstract":"Purpose: to develop a method of coal gradation to predict the hazardous properties of coal seams during mining. Methodology: based on the study of the interdependence between indicators of the degree of coal metamorphism, which characterize various aspects of its transformation in geological processes. Results: the dependence of the manifestation of any dangerous property of coal seams during mining operations on the influencing factors of the three blocks is considered. In the general case, the most dangerous properties of coal seams include the release of explosive and flammable gases, sudden emissions of coal and gas, the tendency to spontaneous combustion and the occurrence of endogenous fires, increased dust formation, explosiveness of coal dust and other negative phenomena. To prevent emergencies during mining operations, it is necessary to take into account the influence of factors of all three units. Factors of the first block determine the genetic predisposition of mine shafts to the appearance of dangerous properties under the influence of geological processes and metamorphic transformation of the source material. The factors of the second block include mining and geological conditions of coal seams. On the basis of data on parameters of the first two blocks at stages of designing and operation of the coal enterprise, mining indicators of the third block of factors are put. In contrast to the mining-geological and mining conditions of the second block, the factors of the first block are the least studied and not always reliably established. They must determine under the influence of metamorphism changes in the chemical composition, structure and physical properties of coal in the bowels of the Earth, mainly under the influence of elevated temperature and pressure. Currently, more than thirty factors are known, which in different ways characterise the metamorphic transformations of the starting material. There is a practice when in normative documents for the characteristic of degree of metamorphic transformations of layers in the vast majority of cases one indicator is used – an exit of volatile substances at thermal decomposition of coal without access to air. One indicator can not simultaneously and on all sides characterise the content, structure, chemical and physical and mechanical properties of the organic mass of coal and mineral impurities. It is necessary to proceed from the position that each dangerous property of mine layers depends on a certain influence of several factors of metamorphism. Studies have shown that the carbon content directly controls the overall change in the sum of the main components of organic matter (hydrogen, nitrogen, sulphur, oxygen), and the reflection rate of vitrinite – reflects structural changes in petrographic composition. The chemical activity of coal is also affected by the presence of moisture in different states, composition and properties of mineral impurities. The use of each auxiliary indi","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":"127835723","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-2022-2-78-84
S. Minieiev, S. Demchenko, O. Yanzhula, R. Makarenko
Purpose. Obtaining data on the thermophysical properties of rock samples of PJSC “CG Pokrovske” under normal conditions in order to increase the versatility of methods for determining the location of the fire source, the location of the fire in the produced space, obtaining an assessment of its condition and monitoring control at various stages of combustion. Research methodology. The article is aimed at studying the characteristics of heat transfer in rocks, in particular at determining the thermophysical properties of rocks, for which experimental studies of thermal conductivity, thermal conductivity and specific heat capacity of rock samples of the Pokrovska mine were carried out with the help of a thermal conductivity analyser TНВ-100 and the influence of humidity on their thermal conductivity was determined properties using the MIT-1 thermal conductivity meter. Results. The obtained data on thermal conductivity, thermal diffusivity and specific heat capacity of siltstone, sandstone and coal samples taken from the “CG Pokrovske” can be used to improve the existing methods of finding the source of the fire and its location in the mined space, as well as to assess and control the state of the fire. The result of such an improvement can be any work in which it is possible to obtain a more universal way of assessing the state of the fire – the fact of an extinguished or burning fire, the temperature in the fire zone, determining the location of the coal ignition centre and, in fact, the fire itself in the mined space. Scientific novelty. It has been established that with an increase in the weight humidity of rock samples, there is a proportional increase in their thermal conductivity, which is explained by the fact that with an increase in humidity, the latter improves thermal contact in places where particles collide, where, first of all, moisture gets into the smallest pores of the material and displaces air from them. Practical significance. In mines, great importance is given to the forecast of temperature indicators when measuring the temperature of the fire rock in the excavation to assess the process of fire development in order to extinguish them as quickly as possible. These indicators are important for the actual assessment of the state of the environment in the centre of its extinguishing, as they are control for determining the cooling of the rocks of the massif and, ultimately, indirectly indicate the fact of a burning or extinguished fire. The thermophysical properties of rock samples obtained as a result of experimental studies make it possible to increase the versatility of fire assessment methods at various stages of its combustion and, in general, to increase the level of endogenous fire safety of coal mines.
{"title":"EXPERIMENTAL STUDIES OF THERMOPHYSICAL PROPERTIES OF MOUNTAIN SOLIDS","authors":"S. Minieiev, S. Demchenko, O. Yanzhula, R. Makarenko","doi":"10.31474/1999-981x-2022-2-78-84","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-2-78-84","url":null,"abstract":"Purpose. Obtaining data on the thermophysical properties of rock samples of PJSC “CG Pokrovske” under normal conditions in order to increase the versatility of methods for determining the location of the fire source, the location of the fire in the produced space, obtaining an assessment of its condition and monitoring control at various stages of combustion. Research methodology. The article is aimed at studying the characteristics of heat transfer in rocks, in particular at determining the thermophysical properties of rocks, for which experimental studies of thermal conductivity, thermal conductivity and specific heat capacity of rock samples of the Pokrovska mine were carried out with the help of a thermal conductivity analyser TНВ-100 and the influence of humidity on their thermal conductivity was determined properties using the MIT-1 thermal conductivity meter. Results. The obtained data on thermal conductivity, thermal diffusivity and specific heat capacity of siltstone, sandstone and coal samples taken from the “CG Pokrovske” can be used to improve the existing methods of finding the source of the fire and its location in the mined space, as well as to assess and control the state of the fire. The result of such an improvement can be any work in which it is possible to obtain a more universal way of assessing the state of the fire – the fact of an extinguished or burning fire, the temperature in the fire zone, determining the location of the coal ignition centre and, in fact, the fire itself in the mined space. Scientific novelty. It has been established that with an increase in the weight humidity of rock samples, there is a proportional increase in their thermal conductivity, which is explained by the fact that with an increase in humidity, the latter improves thermal contact in places where particles collide, where, first of all, moisture gets into the smallest pores of the material and displaces air from them. Practical significance. In mines, great importance is given to the forecast of temperature indicators when measuring the temperature of the fire rock in the excavation to assess the process of fire development in order to extinguish them as quickly as possible. These indicators are important for the actual assessment of the state of the environment in the centre of its extinguishing, as they are control for determining the cooling of the rocks of the massif and, ultimately, indirectly indicate the fact of a burning or extinguished fire. The thermophysical properties of rock samples obtained as a result of experimental studies make it possible to increase the versatility of fire assessment methods at various stages of its combustion and, in general, to increase the level of endogenous fire safety of coal mines.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132035899","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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