【摘要】 以芦子沟矿3107特厚煤层综放工作面为工程背景,应用数值模拟分析了3107工作面采动阶段煤柱侧帮围岩应力动态变化特征,巷道煤柱侧帮围岩受采动影响强烈。理论分析了回采巷道强动压显现机理,基于此,提出强动压巷道顶板大深度预切缝卸压技术,并阐述了其技术原理。预切缝后,沿空巷道超前支护段围岩应力降低,侧向支承压力峰值位置向工作面中部移动,沿空巷道超前支承压力峰值位置向工作面推进方向前移,能够有效改善超前支护段巷道围岩应力状态。数值模拟及现场实测结果表明预切缝后超前支护段巷道围岩稳定,巷道变形量减小,矿山压力显现缓和。更多还原

【Abstract】 It taking 3107 fully mechanized caving face with extra thick coal seam in Luzigou coal mine as background,the dynamic change features of surrounding rock stress of coal pillar side in the roadway during mining stage of 3107 working face was analyzed by detailed numerical simulation analysis,mining influence of surrounding rock was intensity,appearance mechanism of roadway intensely dynamic pressure was analyzed in theory,based on it,large depth pre-slicing releasing technique in roof of intensely dynamic roadway was put forward,and then mechanism was illustrated. After slicing,surrounding rock stress of roadway along goaf in advanced supporting section decreased obviously,the position of the peak value of lateral abutment pressure moved toward the middle part of working face,the peak value of advanced abutment pressure moved toward cutting direction of working face,and then surrounding rock stress state could be improved obviously,the results of numerical simulation and field measured showed that surrounding rock of roadway was stability after slicing,and roadway convergence decreasing,coal pressure relaxed alleviate.更多还原