寺家庄矿15106工作面顶板低位抽放巷合理层位研究

Study on Reasonable Level of Roof Low Level Drainage Roadway in Sijiazhuang 15106 Working Face

为了解决寺家庄矿15106工作面上隅角瓦斯易积聚的难题,基于上覆岩层破坏的"O"型圈理论,提出沿走向在顶板布置低位抽放巷方法。基于相似模型实验和理论计算得到"O"型圈离层裂隙区范围为采动侧0~20 m,低位抽放巷位置范围应与工作面顶板垂距5~9 m,与回风巷内错距0.8~21.5 m。FLUENT模拟结果表明:低位抽放巷位置为垂距7~9 m,内错距3~9 m时,抽采效果最佳。为了便于下行钻孔的实施,现场将低位抽放巷布置位置为垂距7.2 m,与回风巷内错距5.1 m,回采初期,由于大裂隙尚未形成,上隅角瓦斯浓度存在超限危险,正常抽采后,低位高抽巷瓦斯纯流量约为34.7 m^3/min,上隅角瓦斯浓度稳定在0.47%,符合规程要求,解决了上隅角瓦斯积聚的问题。

In order to solve the problem of easy accumulation of corner gas in 15106 working face of Sijiazhuang Mine,based on the"O"ring theory of overburden rock damage,a method of arranging low-level drainage lanes on the roof was proposed.Based on similar model experiments and theoretical calculations,it is obtained that the fracture zone of the"O"ring delaminated zone is0-20 m on the mining side.The position of the low-level drainage lane should be 5-9 m from the roof of the working face,and within the return air lane.The offset is 0.8-21.5 m.FLUENT simulation results show that the drainage effect is the best when the low-level drainage lane is at a vertical distance of 7-9 m and an internal offset of 3-9 m.In order to facilitate the implementation of downhole drilling,the layout of the low-level drainage lane was set at a vertical distance of 7.2 m,and the offset distance from the return air lane was 5.1 m.At the beginning of the mining,because the large cracks have not yet formed,the gas concentration at the upper corner is dangerous after normal drainage,the gas flow in the low-level and high-drainage lane is about 34.7 m^3/min,and the gas concentration in the upper corner is stable at 0.47%,which meets the requirements of the regulations and solves the problem of gas accumulation in the upper corner.