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以某矿特厚煤层开采为背景,运用理论计算和数值模拟的方法,分析了不同条件下特厚煤层综放开采侧向支承压力分布特征。基于极限平衡理论计算侧向支承压力峰值距煤壁距离,运用FLAC~(3D)有限差分软件分析工作面后方采空区顶板垮落之后,煤层厚度和煤层埋深对侧向支承压力分布的影响。分析表明:煤层厚度增加时,侧向支承压力峰值逐渐降低,但塑性破坏区逐渐增大,且应力峰值逐渐远离煤壁;而煤层埋深与侧向支承压力峰值正相关,塑性破坏区也随着埋深增加逐渐增大,且峰值越深入煤体。分析掌握了不同条件下侧向支承压力较低区域,将沿空巷道及煤柱布置在此区域,利于巷道支护,对煤矿安全高效开采具有重要意义。
Based on the mining of a thick seam in a certain mine, the lateral pressure distribution characteristics of fully mechanized top coal caving mining under different conditions are analyzed with the method of theoretical calculation and numerical simulation. Based on the theory of limit equilibrium, the distance between the lateral bearing pressure peak and the coal wall was calculated. The effect of coal seam thickness and coal seam depth on the lateral bearing pressure distribution was analyzed by FLAC 3D finite difference software after caving of the roof of the mined area . The analysis shows that when the thickness of coal seam increases, the peak value of lateral bearing pressure decreases gradually, but the plastic failure area increases gradually and the stress peak gradually moves away from the coal wall. The depth of coal seam is positively correlated with the peak value of lateral bearing pressure, Buried depth increases gradually, and the deeper the peak depth of coal. It analyzes and grasps the lower pressure of lateral support under different conditions, and arranges gob-side roadway and coal pillar in this area, which is good for roadway support and is of great significance for safe and efficient mining of coal mines.