高位孔抽采上被保护层卸压瓦斯的研究及其应用  

Study on Relief-pressure Gas Drainage in Upper Protected Layer with High-level Borehole and Its Application

作　　者：朱红青[1] 张民波[1] 冯世梁[1] 申健[1] 胡瑞丽[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院

出　　处：《中国安全科学学报》2013年第2期92-96,共5页China Safety Science Journal

摘　　要：为防止上被保护层卸压瓦斯大量涌向保护层工作面,进而造成沿空留巷和采空区瓦斯超限,依据保护层开采卸压理论以及采空区上覆岩层裂隙带中瓦斯运移规律,在羊东矿8463工作面沿空留巷布置高位孔抽采上被保护层卸压瓦斯。通过理论计算与FLAC3D数值模拟,确定采空区上覆岩层裂隙发育带的范围。结合现场实际情况,设计高位孔关键参数:终孔位置高度为22.4m,终孔间距为9m,沿倾向控制范围为9.3～60m,钻场滞后工作面70m。现场应用结果表明,单孔瓦斯抽放流量最高为0.853m3/min,沿空留巷瓦斯体积分数最高为0.46%。In order to prevent relief-pressure gas of upper protected seam from flowing to the protective working face,causing gas concentration exceeding limits in gob-side entry retaining and goaf,high-level boreholes were designed to extract relief-pressure gas of upper protected seam in gob-side entry retaining of 8463 working face in Yangdong coal mine,on the basis of protective seam mining relief-pressure theory and gas migration law in 'fracture zone' of the depressing zones overlying a goaf.The range of the 'fissure development zone' of the depressing zones overlying a goaf was defined through theoretical calculation and FLAC3D numerical simulation.According to the actual situation of the site,key parameters of high-level boreholes were designed:the height of final boreholes location was designed 22.4 m,the space between final boreholes was designed 9 m,the range of inclination controlling was designed 9.3 to 60 m,and the distance between drilling site and working face was 70 m.The highest gas extraction flowrate of the single test hole was 0.853 m3/min and the highest gas volume fraction in gob-side entry retaining was 0.46%.

关 键 词：沿空留巷 高位孔 上被保护层 裂隙带 数值模拟 瓦斯抽采 

分 类 号：X936[环境科学与工程—安全科学]