浅埋近距离煤层群房柱采空区下支架合理支护强度确定

为了确保浅埋近距离煤层群房柱采空区下综采工作面的安全高效开采，采用数值模拟和理论分析的方法研究了房柱式采空区下工作面支架合理支护强度。研究表明，房柱采空区残留煤柱集中应力影响的深度约为20 m，下部工作面回采时应考虑集中应力的影响，残留煤柱对下部工作面开采合理的应力集中系数为1.30；并根据“短砌体梁”理论，计算得到了大地精煤矿房柱采空区下综采工作面支架合理支护强度为1.07～1.21 MPa。该研究方法和结果对类似条件下综采工作面支架合理工作阻力的确定具有借鉴和指导意义。

Reasonable Supporting Intensity in Shallow Short-distance Multi-seams Working Face under Room-Pillar Goaf

In order to ensure the safe and high efficient production of the shallow short-distance multi-seams coal in fully mechanized coal face，the rational support strength of a room pillar beneath goaf is investigated by the theoretical analysis and the numerical simulation.The results show that the depth of stress concentration at the remained pillars is about 20 m，so the effect of concentrated stress at the under-part working face.In the support control area，the vertical stress concentration factor of the remained coal pillars on the under-part is 1.30.Based on “short voussoir beam” theory，the rational support intensity of the coal room pillars in Dadijing coal mine for the fully mechanized coal face under goaf is calculated as the value from 1.07 to 1.21 MPa.The research can offer some meaningful reference and guide for determining the reasonable working resistance of the support in the similar condition of fully mechanized working face.