高抽巷层位对采空区自燃危险性影响的数值模拟分析

Numerical simulating analysis of spontaneous combustion risk of goaf in different positions of high drainage tunnel

针对高抽巷抽采瓦斯可能诱发的采空区自燃问题,以大佛寺煤矿40108工作面构建采空区气体渗流模型,分析了不同垂距和平距下高抽巷抽采瓦斯时对采空区自燃危险性的影响。结果表明:高抽巷与煤层顶板的垂距越大,氧化升温带的宽度越大,采空区自燃危险性越高。高抽巷距回风巷平距为30m时,氧化升温带的宽度最小,采空区自燃危险性最低。依据研究结论,结合高抽巷抽采瓦斯时的层位要求,分析得出大佛寺煤矿40108工作面高抽巷最佳位置为距煤层顶板垂距30m,距回风巷平距30m处。

Aiming at the problems of spontaneous combustion induced by gas drainage of high drainage tunnel in goaf, the gas seepage model of goaf in 40108 working face in Dafosi mine was built, and the risk of spontaneous combustion of goaf when draining gas in different vertical and horizontal distance of high drainage tunnel was ana- lyzed. The results showed that ： the vertical distance between high drainage tunnel and coal seam roof is bigger, the oxidation heating zone is wider and the risk of spontaneous combustion of goaf is higher. While the horizontal dis- tance between high drainage tunnel and return airway is 30m, the oxidation heating zone is minimum, and the risk of spontaneous combustion of goaf is the lowest. Based on the conclusion of the study, combining with the position requirements of gas drainage of high drainage tunnel, it showed that the optimal vertical distance between high drainage tunnel and coal seam is 30m, and the optimal horizontal distance between high drainage tunnel and return airway is 30m.