煤层群倾斜煤柱支承压力分布及传播规律研究

Research on Abutment Pressure Distribution of Coal Seams Inclined Coal Pillars and Propagation Law

以北京大安山煤矿为工程背景,采用理论分析和数值模拟的方法,在倾斜煤柱存在的情况下,对煤层群倾斜煤柱的支承压力分布及传播规律进行了研究与分析,得到了煤层群倾斜煤柱支承压力的传播深度较大,应力沿垂直煤体(煤柱)方向呈现椭圆形向下阶梯分布,但影响范围仅仅在相邻煤层较大的结论。上煤层留20 m的煤柱,就可在下煤层中产生应力集中,而在采空区的一侧布置煤柱基本影响不到下煤层原岩应力的分布。这一研究结论对于煤层群倾斜煤柱条件下工作面的安全生产和支护设计都有一定的指导意义。

Taken the Beijing Dahnshan Coal Mine as an engineering background, research and a-nalysis were done on abutment pressure distribution of coal seams inclined coal pillars and propagation law by adopted theoretical analysis and numerical simulation with the existing of inclined coal pillars. The related results show that transmit deepness of abutment pressure of coal seams inclined coal pillars was large, stress along vertical direction of coal（ coal pillars） presented oval down ladder distribution, but the influence range only was large at adjacent coal seam were obtained. Left 20m coal pillar at upper coal seam could produced stress concentration at lower coal seam, while coal pillar arranged on one side of goal hardly effected the distribution of rock stress of lower coal seam. This result has a certain significant guidance for both safe production and support design of working face under the condition of coal seams in-clined coal pillars.