近距离上位煤层开采底板破坏规律分析

针对近距离煤层群开采中存在开采中受多重动压影响，煤柱留设、巷道布置随意性强、缺少有效支护方式等问题，以己_16-17-23140运输巷为例，采用理论分析、数值模拟方法，研究了近距离上位煤层开采底板破坏规律，分析得出了侧向支承压力峰值随着与煤壁距离增大快速达到载荷峰值，得出侧向支承压力集度计算公式；计算得出平煤股份四矿己15煤层开采后的底板最大损伤破坏深度为30 m，利用FLAC^3D数值模拟软件模拟分析了上位煤层开采下伏煤岩体应力变化规律，随着垂直距离增加，支撑载荷集中系数慢慢减小。研究对矿井下分层全锚支护具有参考价值。

Analysis on law of floor failure in mining upper coal seam at close distance

In view of the existence of multiple dynamic pressures during the mining of short-distance coal seams，the coal pillars，the random layout of the roadway，and the lack of effective support methods，etc，take Ⅵ_16-17-23140 haulage gateway as an example and adopt theoretical analysis.Numerical simulation method was use to study the failure law of the mining floor of the upper coal seam at a close distance.It was concluded that the lateral support pressure peak reached the load peak quickly as the distance from the coal wall increased，and obtained the calculation formula of the lateral support pressure concentration；it was concluded that the maximum damage depth of the floor after the mining of the Ⅵ₁₅ coal seam of Pingdingshan Coal Mining Company is 30 m.The FLAC^3D numerical simulation software was used to simulate and analyze the stress change law of the underlying coal and rock mass in the upper coal seam.As the vertical distance increases，the supporting load is concentrated.The coefficient slowly decreases.The research has great reference value for layered full-bolt supporting in underground mines.