卸压开采下瓦斯抽采方法和钻孔布置研究

Research on gas extraction method and boreholes arrangement under pressure relief mining

为了研究卸压开采下瓦斯抽采方法和钻孔布置,理论分析了下被保护层瓦斯汇集和流动特征及裂隙发育规律,采用FLAC^3D数值模拟软件,研究了工作面底板煤岩体应力状态分析、瓦斯抽采钻孔布置情况以及工作面推进关系与瓦斯抽采量、底板巷瓦斯抽采纯量的关系。研究得出,卸压瓦斯抽采量得到了大幅度的提升,底板巷瓦斯抽采也得到了大幅度的增长。

In order to study gas extraction method and borehole layout under pressure relief mining,gas collection and flow characteristics of lower protected layer and law of fracture development were analyzed theoretically.By using FLA^C3 Dnumerical simulation software,the stress state analysis of coal and rock mass in working face floor,the arrangement of gas extraction boreholes and the relationship between advancing of working face and gas extraction amount and the net amount of gas extraction in floor roadway were studied.The research results showed that gas extraction volume has been greatly improved,and gas extraction of floor roadway has also been greatly increased.