Results 181 to 190 of about 1,887 (217)
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International Journal of Rock Mechanics and Mining Sciences, 2009
Abstract A key issue in underground mining is to understand and master the evolving patterns of stress induced by mining, and to control and utilize the action of rock pressure. Numerical and physical modeling tests have been carried out to investigate the distribution patterns of stress in the rock surrounding a fully mechanized top-coal caving ...
G.X. Xie, J.C. Chang, K. Yang
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Abstract A key issue in underground mining is to understand and master the evolving patterns of stress induced by mining, and to control and utilize the action of rock pressure. Numerical and physical modeling tests have been carried out to investigate the distribution patterns of stress in the rock surrounding a fully mechanized top-coal caving ...
G.X. Xie, J.C. Chang, K. Yang
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Numerical simulation of hard top-coal's pulsed caving in fully mechanized caving face
2010 International Conference on Mechanic Automation and Control Engineering, 2010In order to improve the top-coal recovery in fully mechanized longwall face, the hard top-coal caving was simulated through particle flow program in three dimensions. According to the pressing cracking test of hard coal, the top-coal's fragmentation size and spatial distribution were simulated.
Jinping Wei +3 more
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Measurement and Analysis for Gas Emission Characters in Fully Mechanized Caving Face
Applied Mechanics and Materials, 2013According to the practical condition of 3401 fully mechanized caving face in Dayang coal mine, the relationship between strata behaviors, mining technology and stope gas emission are analyzed through real-time monitoring of the support working resistance, advance abutment pressure and gas concentration of working face.
Xin Jian Li +3 more
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Technological optimization of fully mechanized caving mining face with large mining heights
Journal of Coal Science and Engineering (China), 2013Fully 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 ...
Lu-Jia Fan, Sheng-Li Yang
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Characteristics of Gas Emission at Super-Length Fully-Mechanized Top Coal Caving Face
Journal of China University of Mining and Technology, 2007Abstract Characteristics of gas emission at the K8206 working face in the Third mine of the Yangquan Coal Group were investigated. The effects of strata movement, advancing velocity of working face, production capacity of working face and gas extraction capability of strike high-level entry on gas emission at K8206 working face were analyzed.
Jia-lin XU +3 more
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Optimization Studies on Pillar Size of Fully Mechanized Caving Face
Advanced Materials Research, 2014By theoretical calculations, numerical simulation and field monitoring methods to analyze the stress distribution and the extent of damage of coal pillar determine a reasonable size is about 10m, can improve the recovery rate of coal resources, and to ensure the roadway stability. 10m pillar coal resources compared with the previous 20m pillar recovery
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Gas Control Technology of Fully Mechanized Caving Face of Hard Desorbing Coal Seam
Advanced Materials Research, 2013Basing on the problems of residual coal in goaf in fully mechanized caving face in hard desorbing coal seam, high content of residual gas, large gas emission, serious gas overrun in return airflow corner and vitiated air, combing the actual situation in 3-219 fully mechanized caving face, the paper has adopted adjacent goaf drainage, drainage in gas ...
Gang Wang, Hai Yang Wang, Xin Hua Zhang
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Study on Comprehensive Gas Control Technology of High-Gas Fully Mechanized Caving Face
Advanced Materials Research, 2012In order to comprehensively control the gas of 1151(3) fully mechanized caving face in Xieqiao coalmine scientificly and efficiently, combining the actual situation of the face, gas drainage technologies such as roof drilling, drilling along seam, gas drainage in upper corner, roof drainage roadway had been applied and a comprehensive gas control ...
Weimin Cheng, Hai Yang Wang, Lu Lu Sun
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Applied Mechanics and Materials, 2011
The elastic-plastic constitutive relationship and the Drucker-prager yielding criterion are used to simulate the behaviour of non-linear geo- materials. Dynamic change laws of abutment pressure of S2S2 work face of xiaokang coal mine is simuluted by the ansys program.
Hong Chun Xia, Zhen Qi Song, Li Jing Ru
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The elastic-plastic constitutive relationship and the Drucker-prager yielding criterion are used to simulate the behaviour of non-linear geo- materials. Dynamic change laws of abutment pressure of S2S2 work face of xiaokang coal mine is simuluted by the ansys program.
Hong Chun Xia, Zhen Qi Song, Li Jing Ru
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Numerical simulation on the delivery law of gob gas of fully mechanized caving face
Journal of Coal Science and Engineering (China), 2008According to the cover rock caving features, the gob of fully mechanized caving face was divided into 3 zones: natural collected zone, pressure effecting zone and press stable zone. Based on these and the gob gas flow control equation, and considered the influence to the mining fissured zone of gas drainage, also made use of CFD software, we found an ...
Shu-gang Li, Wei Zhang, Hai-fei Lin
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