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
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
For transportation of solid backfill material such as waste and fly ash from the surface to the bottom of the shaft in a fully mechanized backfilling coal backfilling coal mining technology, we developed a new vertica...For transportation of solid backfill material such as waste and fly ash from the surface to the bottom of the shaft in a fully mechanized backfilling coal backfilling coal mining technology, we developed a new vertical transportation system to transport this type of solid backfill material. Given the demands imposed on safely in feeding this material, we also investigated the structure and basic parameter of this system. For a mine in the Xingtai mining area the results show that: (1) a vertical transportation system should include three main parts, i.e., a feeding borehole, a maintenance chamber and a storage silo; (2) we determined that 486 mm is a suitable diameter for bore holes, the diameter of the storage silo is 6 m and its height 30 m in this vertical transportation system; (3) a conical buffer was developed to absorb the impact during the feeding process. To ensure normal implementation of fully mechanized backfilling coal mining technology and the safety of underground personnel, we propose a series of security technologies for anti-blockage, storage silo cleaning, high pressure air release and aspiration. This vertical transporting system has been applied in one this particular mine, which has fed about 4 million tons solid material with a feeding depth of 350 m and safely exploited 3 million tons of coal.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
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.
基金support for this work provided by the National Natural Science Foundation of China (No. 51074165)the major program of the National Natural Science Foundation of China (No. 50834004)the Innovation Project of Graduate Students of Jiangsu Province (No. CXZZ11-0308)
文摘For transportation of solid backfill material such as waste and fly ash from the surface to the bottom of the shaft in a fully mechanized backfilling coal backfilling coal mining technology, we developed a new vertical transportation system to transport this type of solid backfill material. Given the demands imposed on safely in feeding this material, we also investigated the structure and basic parameter of this system. For a mine in the Xingtai mining area the results show that: (1) a vertical transportation system should include three main parts, i.e., a feeding borehole, a maintenance chamber and a storage silo; (2) we determined that 486 mm is a suitable diameter for bore holes, the diameter of the storage silo is 6 m and its height 30 m in this vertical transportation system; (3) a conical buffer was developed to absorb the impact during the feeding process. To ensure normal implementation of fully mechanized backfilling coal mining technology and the safety of underground personnel, we propose a series of security technologies for anti-blockage, storage silo cleaning, high pressure air release and aspiration. This vertical transporting system has been applied in one this particular mine, which has fed about 4 million tons solid material with a feeding depth of 350 m and safely exploited 3 million tons of coal.
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.
