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《Coal Science and Technology》 2014-07
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Analysis on Disaster-causing Mechanism and Key Stratum Compound Effect of Thick Hard Igneous Rock

SHU Long-yong;DENG Zhi-gang;CHANG Wei-bin;KONG Sheng-li;Mine Safety Technology Branch,China Coal Research Institute;State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute);School of Safety Engineering,China University of Mining and Technology;  
Based on the water and gas outburst accident of No. 2 surface borehole in Yangliu coal mine,the combination relationship between the two igneous rocks was analyzed using the combining method of theoretical analysis and numerical simulation,strata cracks evolution law under thick hard igneous rock during protective layer mining was researched,and the reason for water and gas outburst accident of No. 2 surface borehole was analyzed. The results demonstrated that the magma intrusion had a specific effect on coal seams. There are large quantities of pyrolysis pores in coal seam nearby igneous rock,which make the adsorption ability of coal seam enhance. The thick hard igneous rock controls the overlying strata movement,a large number of separations and fractures exist in the separation zone for a long time,which provide migration channels and enrichment area for relief-pressure gas and water. The igneous rock releases a lot of elastic strain energy when fracturing suddenly,this induces to the occurrence of compound dynamic disaster. Based on the research results,the prevention countermeasures and suggestions were put forward.
【Fund】: 国家科技重大专项资助项目(2011ZX05040-001 2011ZX05063-009);; 国家重点基础研究发展计划(973计划)资助项目(2011CB201206)
【CateGory Index】: TD712
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