常村矿2103工作面顶板走向高抽巷合理层位的确定

Determination on Rational Layer of High Level Gas Drainage Gateway Along Roof Strike of No.2103 Coal Mining Face in Changcun Mine

为了防止常村矿2103工作面上隅角瓦斯超限,基于"O"形圈理论以及采空区上覆岩层裂隙发育规律,提出在其顶板布置高抽巷抽采采空区瓦斯,采用理论计算与数值模拟相结合的方法分析预测采空区上覆岩层裂隙发展规律,确定了裂隙发育带范围为22.9～36.6m;并通过现场测试单孔瓦斯抽采量与工作面的推进关系得到裂隙发育带范围为23.3～38.9m,验证了理论计算与数值模拟结果的正确性。为防止高抽巷被破坏,选取距离冒落拱的安全保险高度为1.5倍采高,将高抽巷层位设计为31.5～36.6m。

In order to prevent a gas content over the limit at the upper comer of No. 2103 coal mining face in Changcun Mine, based on the ＂0＂ ring theory and the crack development law of the overburden strata in the goat＇, a high level gas drainage gateway set in the roof strata was provided to drain the gas in the goal, a theoretical calculation and numerical simulation combined method was applied to analyze and predict the crack development law of the overburden strata above the goaf and a scope of the crack developmen zone determined was 22.9 - 36. 6m. With the site measurement and test on relationship between the single borehole gas drainage value and the forward advancing of the coal mining face, the scope of the crack development zone obtained was 23.3 - 38.9m and the correctness of the theoretical calculation and numerical simulation results were verified. In order to prevent the high level has drainage gateway to be failed, a safety protection height distanced to the roof falling arch selected was 1.5 times higher than the coal mining height and the layer level of the high level gas drainage gateway designed was 31.5 -36. 6m.