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采煤工作形成的采空区内残留大量的遗煤,致使采空区内集聚了大量瓦斯。针对我国采空区瓦斯涌出量大,抽放困难及抽放力度不大的情况,结合大隆煤矿的实际情况,应用铁煤集团新研发的地面钻孔抽放封闭采空区瓦斯技术,对大隆煤矿的W2-705采空区进行试验研究,通过理论和实际相结合,研究结果表明:地面钻孔抽放封闭采空区瓦斯是可行的,且效果非常好。实现了采空区内煤层气资源的地面开发与利用,同时为跨采空区抽放工作面瓦斯提供了设计、施工实验数据。
A large amount of coal left in the mined-out area formed by coal mining resulted in a large amount of gas gathering in the gob area. In view of the situation of large amount of gas emission, difficulty of drainage and small drainage in the goaf in our country, combined with the actual situation of Dalong Coal Mine, The study on the W2-705 gob area in Dalong Coal Mine is carried out. Through the combination of theory and practice, the results show that it is feasible and feasible for the ground borehole to blow away the gas in the closed goaf. It realizes the development and utilization of coalbed methane resources in goaf, and provides design and construction experimental data for gas drainage in goaf across gob.