关键词: 低透气性煤层群, 瓦斯抽采, 综合治理技术, 首采保护层

Abstract: According to the characteristics of high gas content and high gas pressure in low permeability seam group, the gas control difficulty of working face in first mined protective seam, and the difficulty of comprehensive eliminating outburst in short distance coal seam group, the comprehensive control technology of mining protective seam combined with gas drainage in gas control lane of the first mined seam , relieved gas drainage through surface well drilling , gas drainage from strike drilling hole in high position and gas drainage through pipe laying in upper corner was put forward ,for example in Coal Mine Wulan. The result showed that the gas flow and gas concentration was stable changing with time, the gas flow and gas concentration increased firstly then decreased along with working face being advanced, the maximum gas concentration of return air sides in working face was 0.36%, the maximum gas concentration was 0.5% and the maximum gas drainage flow was 105.8m3/min in upper corner, which solved the problem of gas transfinite effectively and achieved mining safely and efficiently.