A combined method of numerical simulation and field testing was adopted in this study in the interest of solving the problem of hard to control high concentrate dusts on a fully mechanized mining face. In addi- tion, ...A combined method of numerical simulation and field testing was adopted in this study in the interest of solving the problem of hard to control high concentrate dusts on a fully mechanized mining face. In addi- tion, the dust suppression effect of a multi-direction whirling air curtain was studied in this paper. Under the influence of the wall attachment effect, the compressed air which blows out from the two-phase or three-phase radial outlets on the generator of the air curtain can form a multi-direction whirling air curtain, which can cover the whole roadway section of a fully mechanized mining face. The traditional method of controlling dust is a forcing system with exhaust overlap which has the major disadvantage of lacking a jet effect and consequently results in poor dust control. It is difficult to form the air flow field within the range of Lp ≤ 5√S. However, due to the effect of this novel system, the radial airflow can be turned into axial airflow allowing fresh air to flow through the length of the heading. The air flow field which is good at controlling dust diffusion can be formed 12.8 m from the heading face. Furthermore, the field measurement results show that before the application of a multi-direction whirling air curtain, the dust concentration is 348.6 mg/m^3 and 271.4 mg/m^3 respectively at the roadway cross-section measurement points which are 5 m and 10 m from the heading face. However, after the application of the multi-direction whirling air curtain, the dust concentration is only 61.2 mg/m3 and 14.8 mg/m^3, respectively. Therefore, the dust control effect of a multi-direction whirling air curtain is obvious.展开更多
Similar material simulation test W9-15 101 fully mechanized caving face with was carried out in a geological model of large mining height in the Liuhuanggou Colliery, in Xinjiang Uigur Autonomous Region. The roof over...Similar material simulation test W9-15 101 fully mechanized caving face with was carried out in a geological model of large mining height in the Liuhuanggou Colliery, in Xinjiang Uigur Autonomous Region. The roof overlying strata movement law in the stope of a fully mechanized caving face with large mining height was studied and show that the roof overlying strata in the stope of a fully mechanized caving face with large mining height can be formed into a stable arch structure; the fracture rock beam is formed resembling a ＂bond beam＂, but it has essentially the structure of ＂multi-span beams＂ under the big structure of the stable arch. The roof overlying strata movement law in the stope of a fully mechanized caving face with large mining height is similar to that of the common, fully mechanized caving stope, which is determined by the deformation and instability of the structure of ＂multi-span beams＂. But because of the differences between the mining heights, the peak pressure in the stope of a fully mechanized caving face with large mining height is smaller while the affected area of abutment pressure is wider in the front of the working face; this is the obvious difference in abutment pressure between the stope of a fully mechanized caving face with large mining height and that of the common.展开更多
Fully mechanized cave mining with large mining height is a new mining method, due to its large mining thickness and lower roadway excavation, the technology has been widely used in China＇s thick seam mining. In order...Fully mechanized cave mining with large mining height is a new mining method, due to its large mining thickness and lower roadway excavation, the technology has been widely used in China＇s thick seam mining. In order to improve the top-coal recovery ratio of fully mechanized cave mining with large mining height, a study was conducted on optimizing the caving process, based on the mechanized caving face 1302N in Longgu Coal Mine. This was achieved by improving the PFC numerical calculation methods, and establishing a more accurate model system. On this basis, the recovery ratio of the top coal in different drawing intervals and technologies was investigated in order to achieve a reasonable caving process. The top-coal tracking system was used for practical surveying of the recovery ratio of top coal.展开更多
The article introduced the key technology, mining process, and back-and-forth mining method for the caving working face of hard-thick coal seams in Datong mine, and researched this innovations process, optimized the s...The article introduced the key technology, mining process, and back-and-forth mining method for the caving working face of hard-thick coal seams in Datong mine, and researched this innovations process, optimized the systemic design and working face out-play, tried to perfect the caving mining technology of hard-thick coal seams further.展开更多
With the advent of the information age, information technology has been widely used in various fields of society and has achieved remarkable results. It has become the core force to promote social development. As a tr...With the advent of the information age, information technology has been widely used in various fields of society and has achieved remarkable results. It has become the core force to promote social development. As a traditional industry, coal mine production, supported by information technology, has witnessed the emergence and application of various new production technologies and intelligent equipment, which has become the key technological support to promote industrial upgrading and production transformation. In coal mine production, the introduction of modern intelligent equipment and technology can significantly improve production efficiency and ensure production safety, especially for fully mechanized working face to achieve intrinsically safe production and to achieve staff reduction and efficiency improvement work has significant practical significance.展开更多
Gas disaster is one of the five major disasters in coal mine. Gas drainage can not only ensure the safe production of working face, but also turn gas into waste and improve the economic benefits of mine. Over the year...Gas disaster is one of the five major disasters in coal mine. Gas drainage can not only ensure the safe production of working face, but also turn gas into waste and improve the economic benefits of mine. Over the years, China has made in-depth research and application of coal seam gas extraction technology, and achieved fruitful results. However, due to the complex geological conditions of coal mines, the occurrence of coal seams and gas disasters in different mines are quite different, so a scientific, feasible, economical and reasonable drainage scheme should be designed according to specific conditions. This paper studies the application of gas drainage technology in fully mechanized coal face under the influence of coal mine adjacent layers, which has good guiding significance.展开更多
At present, in some small-scale and relatively backward coal mining stages in our country, it is difficult to further improve the mining efficiency of the working face, which seriously affects the economic benefits an...At present, in some small-scale and relatively backward coal mining stages in our country, it is difficult to further improve the mining efficiency of the working face, which seriously affects the economic benefits and market competitiveness of enterprises. In this paper, the technical strategies to improve the mining efficiency of fully mechanized coal mining face are analyzed. Based on the analysis of the common coal mine loss problems and the factors affecting the mining efficiency of fully mechanized coal mining face, the technical measures to further improve the mining efficiency of fully mechanized coal mining face are formulated around the five dimensions of mine development mode, cutting design, mining capacity, top coal placement form and working parameters.展开更多
In order to solve the problem that the existing hydraulic support can not be lifted as a whole and the flat car bolt hole can not be fixed properly when it is lowered, a new lifting device for the whole group of hydra...In order to solve the problem that the existing hydraulic support can not be lifted as a whole and the flat car bolt hole can not be fixed properly when it is lowered, a new lifting device for the whole group of hydraulic support in fully mechanized working face was studied. The application practice shows that the device effectively solves the problem of disassembling in the working face and then pulling to the groove for loading when the support is pulled back and moving backwards, which not only greatly improves the working efficiency, but also eliminates the hidden danger of safety.展开更多
With the rapid development of China's market economy, there has been a new change in working methods among various industries. At the same time, due to the influence of new production technologies, the working eff...With the rapid development of China's market economy, there has been a new change in working methods among various industries. At the same time, due to the influence of new production technologies, the working efficiency among various industries has been significantly improved. In order to comprehensively deepen the transformation of market economy and provide sufficient energy support for social development, China's coal mining enterprises have continuously improved the production capacity of equipment linkage devices in fully mechanized coal mining face through the innovative development of new equipment technology, and fully realized the high-quality production of coal mines. However, in the process of coal mining and production, one kind or another of problems are still encountered. As production management personnel, they should fully realize the actual demand for coal mines in the current development of socialist market economy, optimize the equipment linkage quality of fully mechanized coal mining face through continuous innovation and other factors, based on production practice, realize the effective transformation of coal mining technology through effective innovative means and innovative concepts, and comprehensively promote the high-quality production of coal mines, thus laying a foundation for the construction of equipment management for China's energy production enterprises and promoting the high-quality development of the energy industry.展开更多
Complicated mining operations and underground mining are important features of China's coal mining. Due to the limitation of cost and time limit, the coal mining operation can usually be completed through cross-op...Complicated mining operations and underground mining are important features of China's coal mining. Due to the limitation of cost and time limit, the coal mining operation can usually be completed through cross-operation construction. Although this method can shorten the working hours to a certain extent, high risks also follow, which puts forward higher requirements for the safety management of underground work. Especially during the period of installation and withdrawal of fully mechanized coal mining face in coal mine, multiple types of work cooperate with each other, auxiliary transportation of explosion-proof vehicles, frame-type trackless rubber-tyred vehicles, battery cars, support vehicles and other vehicles cooperate with each other at the same time. Therefore, reducing the number of potential safety hazards caused by cross-operation has become the top priority of cross-operation safety management. This paper analyzes and summarizes the reasons for the frequent installation and withdrawal of fully mechanized coal mining face and the cooperation of multiple types of work with cross-operation, and formulates corresponding control measures, hoping to help improve the safety management level of coal mine electromechanical transportation and play a role in preventing accidents.展开更多
According to a lot of practical data in Liujialiang Mine and reliability theory and result of computer simulation, operation regularity of fully mechanized sublevel caving mining production system in the condition of ...According to a lot of practical data in Liujialiang Mine and reliability theory and result of computer simulation, operation regularity of fully mechanized sublevel caving mining production system in the condition of gently inclined complicated geological structure and production shortcomings are found out and reliability of system and output of the working face are predicted finally.展开更多
In recent years, with the rapid development of national economy and the continuous improvement of social level, the level of science and technology is also gradually improving. Among them, in the specific mining proce...In recent years, with the rapid development of national economy and the continuous improvement of social level, the level of science and technology is also gradually improving. Among them, in the specific mining process of China's medium-thick coal seam, a variety of coal mining methods are generally adopted to carry out the mining work, so as to maximize the mining efficiency, promote the long-term development of enterprises and enhance the core competitiveness. However, in the process of top-coal mining, the coal mining rate is relatively poor, and some problems encountered in the mining seriously affect the top-coal mining. Therefore, in this paper, some improvement measures and corresponding improvement measures for the specific working face recovery rate of the current coal in the process of coal mining are proposed, so as to improve the recovery rate in the top-coal working face, and ultimately to improve the working efficiency of coal mining and promote the development of the enterprise itself.展开更多
No.2 1-12090 mining face in Bishan mine of Ruiping Company has large dip angle of coal seam, thick coal seam and many structures. Affected by the structure, the gas on the mining face is abnormal with large concentrat...No.2 1-12090 mining face in Bishan mine of Ruiping Company has large dip angle of coal seam, thick coal seam and many structures. Affected by the structure, the gas on the mining face is abnormal with large concentration and coal dust during mining. Through the construction of one coal seam gas extraction borehole at every 4m interval for geophysical prospecting anomalies in the machine lane and wind lane of stoping area of no. 21-12090 working face, the coal seam gas is pre-pumped, advanced control and "one-hole dual-purpose" gas prevention and control technology, the main effects of controlling gas and reducing coal dust are improved, the time, manpower and material investment are saved, and the safe and efficient production of the coal mining working face is ensured.展开更多
To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining, the roof fracture structural model and mechanical model were dev...To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining, the roof fracture structural model and mechanical model were developed using numerical simulation and theoretical analysis. The roof fracture characteristics of a repeated mining face were revealed and the ground pressure law and roof supporting condi- tions of the repeated mining face were obtained. The results indicate that when the repeated mining face passes the residual pillars, the sudden instability causes fracturing in the main roof above the old goal and forms an extra-large rock block above the mining face. A relatively stable ＂Voussoir beam＂ structure is formed after the advance fracturing of the main roof. When the repeated mining face passes the old goaf, as the large rock block revolves and touches gangue, the rock block will break secondarily under overburden rock loads. An example calculation was performed involving an integrated mine in Shanxi province, results showed that minimum working resistance values of support determined to be reason- able were respectively 11,412 kN and 10,743 kN when repeated mining face passed through residual pillar and goaf. On-site ground pressure monitoring results indicated that the mechanical model and support resistance calculation were reasonable.展开更多
Overview of working face II 1044. Limestone water treatment ideas, schemes, treatment construction conditions, treatment engineering analysis, treatment engineering verification analysis, treatment effect and mining e...Overview of working face II 1044. Limestone water treatment ideas, schemes, treatment construction conditions, treatment engineering analysis, treatment engineering verification analysis, treatment effect and mining evaluation of working face II 1044.展开更多
基金supported by the Key Program of the Coal Joint Funds of the National Natural Science Foundation of China (No.U1261205)the Youth Program of National Natural Science Foundation of China (No.51404147)+2 种基金the Class General Financial Grant from the China Postdoctoral Science Foundation (No.2015M570601)the Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (No.2014RCJJ029)the State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology (No.MDPC2013ZR02)
文摘A combined method of numerical simulation and field testing was adopted in this study in the interest of solving the problem of hard to control high concentrate dusts on a fully mechanized mining face. In addi- tion, the dust suppression effect of a multi-direction whirling air curtain was studied in this paper. Under the influence of the wall attachment effect, the compressed air which blows out from the two-phase or three-phase radial outlets on the generator of the air curtain can form a multi-direction whirling air curtain, which can cover the whole roadway section of a fully mechanized mining face. The traditional method of controlling dust is a forcing system with exhaust overlap which has the major disadvantage of lacking a jet effect and consequently results in poor dust control. It is difficult to form the air flow field within the range of Lp ≤ 5√S. However, due to the effect of this novel system, the radial airflow can be turned into axial airflow allowing fresh air to flow through the length of the heading. The air flow field which is good at controlling dust diffusion can be formed 12.8 m from the heading face. Furthermore, the field measurement results show that before the application of a multi-direction whirling air curtain, the dust concentration is 348.6 mg/m^3 and 271.4 mg/m^3 respectively at the roadway cross-section measurement points which are 5 m and 10 m from the heading face. However, after the application of the multi-direction whirling air curtain, the dust concentration is only 61.2 mg/m3 and 14.8 mg/m^3, respectively. Therefore, the dust control effect of a multi-direction whirling air curtain is obvious.
基金Supported by National Natural Science Fundation of China(50674045)
文摘Similar material simulation test W9-15 101 fully mechanized caving face with was carried out in a geological model of large mining height in the Liuhuanggou Colliery, in Xinjiang Uigur Autonomous Region. The roof overlying strata movement law in the stope of a fully mechanized caving face with large mining height was studied and show that the roof overlying strata in the stope of a fully mechanized caving face with large mining height can be formed into a stable arch structure; the fracture rock beam is formed resembling a ＂bond beam＂, but it has essentially the structure of ＂multi-span beams＂ under the big structure of the stable arch. The roof overlying strata movement law in the stope of a fully mechanized caving face with large mining height is similar to that of the common, fully mechanized caving stope, which is determined by the deformation and instability of the structure of ＂multi-span beams＂. But because of the differences between the mining heights, the peak pressure in the stope of a fully mechanized caving face with large mining height is smaller while the affected area of abutment pressure is wider in the front of the working face; this is the obvious difference in abutment pressure between the stope of a fully mechanized caving face with large mining height and that of the common.
文摘Fully mechanized cave mining with large mining height is a new mining method, due to its large mining thickness and lower roadway excavation, the technology has been widely used in China＇s thick seam mining. In order to improve the top-coal recovery ratio of fully mechanized cave mining with large mining height, a study was conducted on optimizing the caving process, based on the mechanized caving face 1302N in Longgu Coal Mine. This was achieved by improving the PFC numerical calculation methods, and establishing a more accurate model system. On this basis, the recovery ratio of the top coal in different drawing intervals and technologies was investigated in order to achieve a reasonable caving process. The top-coal tracking system was used for practical surveying of the recovery ratio of top coal.
基金Supported by the Production Safety and Supervision of Management Bureau of China(04-116) the Returned Overseas Scholar Fund of Educational Department of China(2003406)+1 种基金 the Soft Science Planning Program of Shandong Province(A200423-6) the National Soft Science Planed Program (2004DGQ3D090)
文摘The article introduced the key technology, mining process, and back-and-forth mining method for the caving working face of hard-thick coal seams in Datong mine, and researched this innovations process, optimized the systemic design and working face out-play, tried to perfect the caving mining technology of hard-thick coal seams further.
文摘With the advent of the information age, information technology has been widely used in various fields of society and has achieved remarkable results. It has become the core force to promote social development. As a traditional industry, coal mine production, supported by information technology, has witnessed the emergence and application of various new production technologies and intelligent equipment, which has become the key technological support to promote industrial upgrading and production transformation. In coal mine production, the introduction of modern intelligent equipment and technology can significantly improve production efficiency and ensure production safety, especially for fully mechanized working face to achieve intrinsically safe production and to achieve staff reduction and efficiency improvement work has significant practical significance.
文摘Gas disaster is one of the five major disasters in coal mine. Gas drainage can not only ensure the safe production of working face, but also turn gas into waste and improve the economic benefits of mine. Over the years, China has made in-depth research and application of coal seam gas extraction technology, and achieved fruitful results. However, due to the complex geological conditions of coal mines, the occurrence of coal seams and gas disasters in different mines are quite different, so a scientific, feasible, economical and reasonable drainage scheme should be designed according to specific conditions. This paper studies the application of gas drainage technology in fully mechanized coal face under the influence of coal mine adjacent layers, which has good guiding significance.
文摘At present, in some small-scale and relatively backward coal mining stages in our country, it is difficult to further improve the mining efficiency of the working face, which seriously affects the economic benefits and market competitiveness of enterprises. In this paper, the technical strategies to improve the mining efficiency of fully mechanized coal mining face are analyzed. Based on the analysis of the common coal mine loss problems and the factors affecting the mining efficiency of fully mechanized coal mining face, the technical measures to further improve the mining efficiency of fully mechanized coal mining face are formulated around the five dimensions of mine development mode, cutting design, mining capacity, top coal placement form and working parameters.
文摘In order to solve the problem that the existing hydraulic support can not be lifted as a whole and the flat car bolt hole can not be fixed properly when it is lowered, a new lifting device for the whole group of hydraulic support in fully mechanized working face was studied. The application practice shows that the device effectively solves the problem of disassembling in the working face and then pulling to the groove for loading when the support is pulled back and moving backwards, which not only greatly improves the working efficiency, but also eliminates the hidden danger of safety.
文摘With the rapid development of China's market economy, there has been a new change in working methods among various industries. At the same time, due to the influence of new production technologies, the working efficiency among various industries has been significantly improved. In order to comprehensively deepen the transformation of market economy and provide sufficient energy support for social development, China's coal mining enterprises have continuously improved the production capacity of equipment linkage devices in fully mechanized coal mining face through the innovative development of new equipment technology, and fully realized the high-quality production of coal mines. However, in the process of coal mining and production, one kind or another of problems are still encountered. As production management personnel, they should fully realize the actual demand for coal mines in the current development of socialist market economy, optimize the equipment linkage quality of fully mechanized coal mining face through continuous innovation and other factors, based on production practice, realize the effective transformation of coal mining technology through effective innovative means and innovative concepts, and comprehensively promote the high-quality production of coal mines, thus laying a foundation for the construction of equipment management for China's energy production enterprises and promoting the high-quality development of the energy industry.
文摘Complicated mining operations and underground mining are important features of China's coal mining. Due to the limitation of cost and time limit, the coal mining operation can usually be completed through cross-operation construction. Although this method can shorten the working hours to a certain extent, high risks also follow, which puts forward higher requirements for the safety management of underground work. Especially during the period of installation and withdrawal of fully mechanized coal mining face in coal mine, multiple types of work cooperate with each other, auxiliary transportation of explosion-proof vehicles, frame-type trackless rubber-tyred vehicles, battery cars, support vehicles and other vehicles cooperate with each other at the same time. Therefore, reducing the number of potential safety hazards caused by cross-operation has become the top priority of cross-operation safety management. This paper analyzes and summarizes the reasons for the frequent installation and withdrawal of fully mechanized coal mining face and the cooperation of multiple types of work with cross-operation, and formulates corresponding control measures, hoping to help improve the safety management level of coal mine electromechanical transportation and play a role in preventing accidents.
文摘According to a lot of practical data in Liujialiang Mine and reliability theory and result of computer simulation, operation regularity of fully mechanized sublevel caving mining production system in the condition of gently inclined complicated geological structure and production shortcomings are found out and reliability of system and output of the working face are predicted finally.
文摘In recent years, with the rapid development of national economy and the continuous improvement of social level, the level of science and technology is also gradually improving. Among them, in the specific mining process of China's medium-thick coal seam, a variety of coal mining methods are generally adopted to carry out the mining work, so as to maximize the mining efficiency, promote the long-term development of enterprises and enhance the core competitiveness. However, in the process of top-coal mining, the coal mining rate is relatively poor, and some problems encountered in the mining seriously affect the top-coal mining. Therefore, in this paper, some improvement measures and corresponding improvement measures for the specific working face recovery rate of the current coal in the process of coal mining are proposed, so as to improve the recovery rate in the top-coal working face, and ultimately to improve the working efficiency of coal mining and promote the development of the enterprise itself.
文摘No.2 1-12090 mining face in Bishan mine of Ruiping Company has large dip angle of coal seam, thick coal seam and many structures. Affected by the structure, the gas on the mining face is abnormal with large concentration and coal dust during mining. Through the construction of one coal seam gas extraction borehole at every 4m interval for geophysical prospecting anomalies in the machine lane and wind lane of stoping area of no. 21-12090 working face, the coal seam gas is pre-pumped, advanced control and "one-hole dual-purpose" gas prevention and control technology, the main effects of controlling gas and reducing coal dust are improved, the time, manpower and material investment are saved, and the safe and efficient production of the coal mining working face is ensured.
基金the National Basic Research Program of China (No.2014CB046905)Innovation Project for Graduates in Jiangsu Province (No.KYLX15_1405)+1 种基金the National Natural Science Foundation of China (Nos.51274191 and 51404245)the Doctoral Fund of Ministry of Education of China (No.20130095110018)
文摘To investigate the abnormal ground pressures and roof control problem in fully mechanized repeated mining of residual coal after room and pillar mining, the roof fracture structural model and mechanical model were developed using numerical simulation and theoretical analysis. The roof fracture characteristics of a repeated mining face were revealed and the ground pressure law and roof supporting condi- tions of the repeated mining face were obtained. The results indicate that when the repeated mining face passes the residual pillars, the sudden instability causes fracturing in the main roof above the old goal and forms an extra-large rock block above the mining face. A relatively stable ＂Voussoir beam＂ structure is formed after the advance fracturing of the main roof. When the repeated mining face passes the old goaf, as the large rock block revolves and touches gangue, the rock block will break secondarily under overburden rock loads. An example calculation was performed involving an integrated mine in Shanxi province, results showed that minimum working resistance values of support determined to be reason- able were respectively 11,412 kN and 10,743 kN when repeated mining face passed through residual pillar and goaf. On-site ground pressure monitoring results indicated that the mechanical model and support resistance calculation were reasonable.
文摘Overview of working face II 1044. Limestone water treatment ideas, schemes, treatment construction conditions, treatment engineering analysis, treatment engineering verification analysis, treatment effect and mining evaluation of working face II 1044.
