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Research into comprehensive gas extraction technology of single coal seams with low permeability in the Jiaozuo coal mining area

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Mining Science and Technology 2011年第4期21卷 483-489页

作者： Fu Jiangwei Fu Xuehai Hu Xiao Chen Li Ou Jianchun School of Resource and Earth Science China University of Mining Er Technology Xuzhou 221008 China Henan Provincial coal seam Gas Development and Utilization Co. LTD. Zhengzhou 450016 China Department of Industry and Business Administration Henan F.ngineering College Xinzheng 451191 China Faculty of Safety Engineering China University of Mining ＆ Technology Xuzhou 221008 China

For a low permeability single coal seam prone to gas outbursts, pre-drainage of gas is difficult and inefficient, seriously restricting the safety and efficiency of production. Radical measures of increasing gas extraction efficiency are pressure relief and infrared antireflection. We have analyzed the effect of mining conditions and the regularity of mine pressure distribution in front of the working face of a major coal mine of the Jiaozuo Industrial （Group） Co. as our test area, studied the width of the depressurization zone in slice mining and analyzed gas efficiency and fast drainage in the advanced stress relaxation zone. On that basis, we further investigated and practiced the exploitation technology of shallow drilling, fan dril- ling and grid shape drilling at the working face. Practice and our results show that the stress relaxation zone is the ideal region for quick and efficient extraction of gas. By means of an integrated extraction technology, the amount of gas emitted into the zone was greatly reduced, while the risk of dangerous outbursts of coal and gas was lowered markedly. This exploration provides a new way to control for gas in working faces of coal mines with low permeability and risk of gas outbursts of single coal seams in the Jiaozuo mining area.

关键词： single coal seam with low permeability High risk gas and outburst coal seamStress relaxation zoneComprehensive gas extractionJiaozuo coal mining areaGas emission

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