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- W2357607681 abstract "Mining key coal seam is an effective measure to reduce outburst risk in adjacent coal seams.The main gas emission source of first working face comes from the protected coal-seam,which can induce the rise of gas concentration. Three vertical bands,including caving zone,fracture zone and swelling zone are formed above the gob during mining the key coal seam.The vertical cracks between protective layer and protected coal seam can be connected with the gob and provide many flow paths for the protected coal-seam gas migration. Thus,gases in the protected layer pour into the gob during the mining of first key coal-seam,which make gas control more difficult than single coal-seam mining.Based on the analysis of three vertical bands and the condition of gas migration,the working face 66210 of Xinzhuangzi coal mine was taken as an example.This paper introduces the comprehensive gas control methods which including relief gas drainage in protected coal seam,vertical cracks and gob,and Y type ventilation in dealing with the problem of methane accumulation at the upper corner of working-face.Gas migration channels were analysed by extracting the relieved gas as well.The practice effectiveness of working face 66210 of Xinzhuangzi coal mine showed that the concentration of gas in the air-return way was below 0.6%. Thus,a safe and highly efficient comprehensive gas control method of first key coal-seam working face mining in the condition of high-gas content multiple coal seams was successfully developed." @default.
- W2357607681 created "2016-06-24" @default.
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- W2357607681 date "2011-01-01" @default.
- W2357607681 modified "2023-09-25" @default.
- W2357607681 title "Comprehensive relieved coal-gas control technology of first mining coal-seam in multiple coal seams" @default.
- W2357607681 hasPublicationYear "2011" @default.
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