A new method using high water content material to mechanically fill cross roadways to form artificial bottom for coal faces was introduced. The reasonable determination of filling range, the optimization of the compou...A new method using high water content material to mechanically fill cross roadways to form artificial bottom for coal faces was introduced. The reasonable determination of filling range, the optimization of the compounding ratio of high water content material, and the filling technique were discussed in detail. This new method has been spread after industrial testing in Baodian Colliery. Compared with the traditional method, the manual wooden chock method, the new one decreases about 40% of the filling range and cost in dealing every one set of cross roadway in the testing condition.展开更多
The variation of the stress in the bolted surrounding rocks structure of the roadway driven along goaf in a fully mechanized top coal caving face with moderate stable conditions are studied by using numerical calculat...The variation of the stress in the bolted surrounding rocks structure of the roadway driven along goaf in a fully mechanized top coal caving face with moderate stable conditions are studied by using numerical calculation. The essential deformation characteristics of the surrounding rocks in this kind of roadway are obtained and the key technology of bolting support used under these conditions is put forward.展开更多
Under the action of abutment pressure in front of fully mechanized coal face with sublevel caving(CFSC),top-coal over CFSC deformed.In the process of whole de- formation of top-coal,it changed from continuum elastic m...Under the action of abutment pressure in front of fully mechanized coal face with sublevel caving(CFSC),top-coal over CFSC deformed.In the process of whole de- formation of top-coal,it changed from continuum elastic mass to non-continuum plastic mass contained fissures,become a loose body.According to its bearing characteristics and mechanical properties,top-coal mass can be divided into four deformation zones along the winning direction of CFSC,i.e.initial stress zone,elastic zone,plastic zone and loose zone.Top-coal in plastic zone located in the post-peak zone of the stress-strain curve for top-coal.With equivalent strain principle of damage mechanics and mathemati- cal theory of statistic,combining the movement law of top-coal,set up a constitutive equa- tion with damage statistics for top-coal in different position in CFSC.The equation illus- trated the mathematical relationship among top-coal bearing capacity,horizontal confining pressure along the winning direction of CFSC and mechanical properties of top-coal mate- rial.The conclusions not only provide a basis for numerical computer simulations on damage deformation and failure mechanism for top-coal,but also further promote the ap- plication of damage mechanics in CFSC.展开更多
The wind tunnel of Ⅱ946 fully mechanized caving face in Luling Coal Mine is a driving tunnel along the goaf. Affected by the mining, the mine pressure appears violently and the tunnel deformation is obvious. The phen...The wind tunnel of Ⅱ946 fully mechanized caving face in Luling Coal Mine is a driving tunnel along the goaf. Affected by the mining, the mine pressure appears violently and the tunnel deformation is obvious. The phenomena such as large roof subsidence, large movement of two sides, failure of support and serious floor heave exist, which lead to whether the support is large and the section of the tunnel cannot meet the safety requirements of ventilation and pedestrians. This brings great risks to the safe production of the mining area, greatly increases the labor intensity of workers and severely restricts the mining progress of the working face. Huaibei Mining Group Luling Coal Mine Fully Mechanized Mining Area 2 has not let go of this difficult problem. It has continuously and deeply explored the wind tunnel control measures, summed up the "1+2+3" and "three soft" medium thick coal seam fully mechanized caving face gob-side entry control method, solved the "three soft" medium thick coal seam fully mechanized caving face gob-side entry control problem, and ensured the "three soft" medium thick coal seam fully mechanized caving face safe mining.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
Abstract On the basis of analyzing floor strata mechanical circumstance of the roadway, the mechanical model was established. The relative displacement of roadway floor, narrow pillar floor coal mass and floor strata ...Abstract On the basis of analyzing floor strata mechanical circumstance of the roadway, the mechanical model was established. The relative displacement of roadway floor, narrow pillar floor coal mass and floor strata was calculated, the results showed that the high abutment pressure on coal mass beside the roadway was the main reason to lead to relative displacement of floor strata. And the roadway floor heave come mainly from three aspects. Firstly, the roadway floor strata is easily fractured by the stretch stress. Secondly, because the high abutment pressure is greater than the uniaxial compressive strength of floor strata, when the roadway floor strata are fractured, the coal mass floor strata at the same depth will be fractured, and broken rock will fluid into the open roadway. Thirdly, comparing with the coal mass floor, the roadway floor is relative ascending.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
In this paper, the fully\|mechanized coal face system is thought of as a fuzzy controller, the various factors that have effect on the controller are found and analysis has been made as to how they effect the fully\|m...In this paper, the fully\|mechanized coal face system is thought of as a fuzzy controller, the various factors that have effect on the controller are found and analysis has been made as to how they effect the fully\|mechanized coal face′s production capacity. Based on the above analysis, this paper establishs a series of data analysis models describing the quantitative characteristics of the fully\|mechanized coal face production system. With this series of data models, 90 fully\|mechanized coal faces are processed and the fuzzy control forecasting model of the fully\|mechanized coal faces production capacity is established. This model is accurate and reliable and has achieved good results in practical applicaton.展开更多
文摘A new method using high water content material to mechanically fill cross roadways to form artificial bottom for coal faces was introduced. The reasonable determination of filling range, the optimization of the compounding ratio of high water content material, and the filling technique were discussed in detail. This new method has been spread after industrial testing in Baodian Colliery. Compared with the traditional method, the manual wooden chock method, the new one decreases about 40% of the filling range and cost in dealing every one set of cross roadway in the testing condition.
文摘The variation of the stress in the bolted surrounding rocks structure of the roadway driven along goaf in a fully mechanized top coal caving face with moderate stable conditions are studied by using numerical calculation. The essential deformation characteristics of the surrounding rocks in this kind of roadway are obtained and the key technology of bolting support used under these conditions is put forward.
基金the National Natural Science Foundation of China(40638040/D0214,50534070/E04)
文摘Under the action of abutment pressure in front of fully mechanized coal face with sublevel caving(CFSC),top-coal over CFSC deformed.In the process of whole de- formation of top-coal,it changed from continuum elastic mass to non-continuum plastic mass contained fissures,become a loose body.According to its bearing characteristics and mechanical properties,top-coal mass can be divided into four deformation zones along the winning direction of CFSC,i.e.initial stress zone,elastic zone,plastic zone and loose zone.Top-coal in plastic zone located in the post-peak zone of the stress-strain curve for top-coal.With equivalent strain principle of damage mechanics and mathemati- cal theory of statistic,combining the movement law of top-coal,set up a constitutive equa- tion with damage statistics for top-coal in different position in CFSC.The equation illus- trated the mathematical relationship among top-coal bearing capacity,horizontal confining pressure along the winning direction of CFSC and mechanical properties of top-coal mate- rial.The conclusions not only provide a basis for numerical computer simulations on damage deformation and failure mechanism for top-coal,but also further promote the ap- plication of damage mechanics in CFSC.
文摘The wind tunnel of Ⅱ946 fully mechanized caving face in Luling Coal Mine is a driving tunnel along the goaf. Affected by the mining, the mine pressure appears violently and the tunnel deformation is obvious. The phenomena such as large roof subsidence, large movement of two sides, failure of support and serious floor heave exist, which lead to whether the support is large and the section of the tunnel cannot meet the safety requirements of ventilation and pedestrians. This brings great risks to the safe production of the mining area, greatly increases the labor intensity of workers and severely restricts the mining progress of the working face. Huaibei Mining Group Luling Coal Mine Fully Mechanized Mining Area 2 has not let go of this difficult problem. It has continuously and deeply explored the wind tunnel control measures, summed up the "1+2+3" and "three soft" medium thick coal seam fully mechanized caving face gob-side entry control method, solved the "three soft" medium thick coal seam fully mechanized caving face gob-side entry control problem, and ensured the "three soft" medium thick coal seam fully mechanized caving face safe mining.
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Abstract On the basis of analyzing floor strata mechanical circumstance of the roadway, the mechanical model was established. The relative displacement of roadway floor, narrow pillar floor coal mass and floor strata was calculated, the results showed that the high abutment pressure on coal mass beside the roadway was the main reason to lead to relative displacement of floor strata. And the roadway floor heave come mainly from three aspects. Firstly, the roadway floor strata is easily fractured by the stretch stress. Secondly, because the high abutment pressure is greater than the uniaxial compressive strength of floor strata, when the roadway floor strata are fractured, the coal mass floor strata at the same depth will be fractured, and broken rock will fluid into the open roadway. Thirdly, comparing with the coal mass floor, the roadway floor is relative ascending.
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In this paper, the fully\|mechanized coal face system is thought of as a fuzzy controller, the various factors that have effect on the controller are found and analysis has been made as to how they effect the fully\|mechanized coal face′s production capacity. Based on the above analysis, this paper establishs a series of data analysis models describing the quantitative characteristics of the fully\|mechanized coal face production system. With this series of data models, 90 fully\|mechanized coal faces are processed and the fuzzy control forecasting model of the fully\|mechanized coal faces production capacity is established. This model is accurate and reliable and has achieved good results in practical applicaton.
