采场覆岩裂隙发育及高位钻孔优化设计——以祁南煤矿34下2工作面为例

摘要

In order to improve the gas extraction effect of high position boring effectively, this paper analyzed the overlying strata fracture development regularities and the change of separation rate during mining of 34low2 working face in Qinan mine, judged the distribution range of caved zone and fractured zone in the coal seam overlying strata, determined that the best range of norm distance parameter of high position boring was 12~22 meters to 32 coal seam roofs, which provided a scientific basis for optimization of high position boring in other working faces.%为了有效地提高高位钻孔的瓦斯抽采效果,采用数值模拟方法分析了祁南矿34 下2工作面开采过程中覆岩的裂隙发育规律和离层率变化规律.判定了煤层上覆岩层冒落带和裂隙带分布范围；确定了钻孔法距参数的最佳范围为距32煤层顶板12～22 m的岩层区域.研究成果可为其他工作面高位钻孔的优化设计提供参考.