软岩煤层不规则煤柱对冲击地压的影响

Influence of Irregular Coal Pillars in Soft Rock Seam on Rock Burst

摘要: 本文基于老石旦煤矿031604工作面为研究对象，其顶板为软岩，局部地区采深超过400 m，现对煤层中的应力集中情况进行分析，受回采需要，随着工作面031604推进，与邻近采空区031601缩面后形成不规则煤柱、及后期与采空区形成煤柱时内部应力集中情况，采用现场监测数据及FLAC数值模拟分析，运用多因素耦合法，经研究发现随着回采工作面的推进，应力集中情况由不规则煤柱中心部分逐渐转移到煤柱031604工作面实体煤一侧。结果表明在此地质条件下031604工作面不会发生冲击地压。

Abstract: Based on Laoshidan Coal Mine 031604 working face as the research object, its roof is soft rock, and the mining depth in some areas is more than 400 m, the stress concentration in coal seam is analyzed. With the advance of working face 031604, irregular coal pillars are formed after con-traction with adjacent goaf 031601, and the internal stress concentration of coal pillars formed with goaf in the later stage is adopted. Based on the field monitoring data and FLAC numerical simulation analysis, using the multi-factor coupling method, it is found that with the advance of the mining face, the stress concentration gradually shifts from the irregular central part of the coal pillar to the solid coal side of the coal pillar 031604 working face. The results show that no rock burst will occur in 031604 working face under this geological condition.