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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 a large amount of pressure-relief gas from being released to the protective layer from flocking to the surface of the protective layer, thereby leading to gob gas leakage along gob-side entry and mined-out area, according to the pressure relief theory of protective layer mining and gas transportation Move the law, the sheep in East Mine 8463 Face Gob-side entry arrangement of high-hole drainage was protected by the pressure relief gas. Through theoretical calculation and numerical simulation of FLAC3D, the range of development zone of overburden rock fracture in goaf is determined. According to the actual situation in the field, the key parameters of high hole design are as follows: the height of final hole is 22.4m, the final hole spacing is 9m, the tendency control range is 9.3 ~ 60m and the lagging face of drilling field is 70m. The field application results show that the maximum discharge rate of single-hole gas drainage is 0.853m3 / min and the maximum gas volume fraction of retained roadways is 0.46%.