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Fracture evolution and pressure relief gas drainage from distant protected coal seams under an extremely thick key stratum

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Journal of China University of Mining and Technology 2008年第2期18卷 182-186页

作者： WANG Liang CHENG Yuan-ping LI Feng-rong WANG Hai-feng LIU Hai-bo National Engineering Research Center for coal ＆ Gas control China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China haizi coal mine Huaibei Mining Industry Group Huaibei Anhui 235000 China

When an extremely thick rock bed exists above a protected coal seam in the bending zone given the condition of a mining protective seam, this extremely thick rock bed controls the movement of the entire overlying stratum. This extremely thick rock bed, called a ＂main key stratum＂, will not subside nor break for a long time, causing lower fractures and bed separations not to close and gas can migrate to the bed separation areas along the fractures. These bed separations become gas enrichment areas. By analyzing the rule of fracture evolution and gas migration under the main key stratum after the deep protective coal seam has been mined, we propose a new gas drainage method which uses bore holes, drilled through rock and coal seams at great depths for draining pressure relief gas. In this method, the bores are located at a high level suction roadway （we can also drill them in the drilling field located high in an air gateway）. Given the practice in the haizi mine, the gas drainage rate can reach 73% in the middie coal group, with a gas drainage radius over 100 m.

关键词： extremely thick key stratum protective seam exploitation fracture evolution gas drainage distant borehole drilling

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Controlling the effect of a distant extremely thick igneous rock in overlying strata on coal mine disasters

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Mining Science and Technology 2010年第4期20卷 510-515页

作者： WANG Liang School of Safety Engineering China University of Mining & Technology Xuzhou 221116 China National Engineering Research Center for coal & Gas Control China University of Mining & Technology Xuzhou 221008 China

Based on theoretical analysis, similarity simulation tests, numerical simulation analysis and field observations, we analyzed rock collapse and rules of fraction evolution of overlying rocks and studied the rules in controlling the effect of an extremely thick igneous rock, found above a main mining coal seam in an area prone to coal mine disasters in the haizi coal mine. The results show that this igneous rock, called a "main key stratum", will not subside nor break for a long time, causing lower fractures and bed separations not to close. The presence of igneous rock plays an important role in rock bursts, mine floods, gas outburst and surface subsidence in coal mines. By analyzing the rules in controlling the effect of this igneous rock, we provide useful references for safety and high efficiency mining in coal mines under special geological conditions.

关键词： extremely thick igneous rock separation rock burst mine flood gas outburst surface subsidence

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维普期刊数据库

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Floor stress evolution laws and its effect on stability of floor roadway

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International Journal of Mining Science and Technology 2013年第5期23卷 631-636页

作者： Zhang Hualei Cao Jianjun Tu Min School of Energy Resources and Safety Anhui University of Science and Technology State Key Laboratory Breeding Base for Mining Disaster Prevention and Control Shandong University of Science and Technology Gas Department Chongqing Branch China Coal Research Institute

According to the distribution of abutment stress in a stope,this research established the mechanical model of mining abutment pressure transmission in floor base on the theory of semi-infnite plate body in *** study takes the 762 working face of haizi coal mine as a case in point,and analyzed the dynamic evolution law of seam floor stress during the mining *** an organic combination of the mining floor stress and surrounding rock stress,the study obtained the change laws of the maximum principle stress and the minimum one for the floor roadway surrounding rock when mining the upper working *** the non-constant pressure force state and the cracks revolution mechanisms of floor roadway surrounding rock,the research built the mechanical model of roadway *** results verify the reliability of the above ***,this model could provide the theoretical basis and technical support for controlling floor roadway surrounding rock.

关键词： Floor Mining abutment pressure Floor roadway Cracks evolution mechanisms

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