煤柱宽度对综放面围岩应力分布规律影响

Effect of coal pillar width on the stress distribution law of surrounding rocks in fully mechanized top-coal caving mining face

护巷煤柱宽度及巷道相对工作面位置的不同,将引起巷道围岩应力重新分布和岩层移动的差异,对回采巷道稳定性及其维护有重要影响.以谢桥煤矿1151(3)综放面地质技术条件为背景,采用计算机数值模拟并结合现场实测研究,揭示了煤柱宽度变化对综放面围岩应力分布及变化规律的影响.研究表明,综放回采巷道护巷煤柱宽度的变化,不仅使煤柱内应力分布规律不同,而且使得相邻工作面煤体内应力分布规律也不同,二者应力分布随煤柱宽度变化而转移;巷道维护状态是工作面煤层和煤柱内应力场共同作用的结果,护巷煤柱的合理宽度应小于巷帮实体煤内应力向煤柱内转移的临界宽度.

Coal pillar width and gateway location to face result in the differences of stress redistribution and rock seam movement and importantly influence gateway stability and maintenance. According to the geological and mining technical conditions of the No. 1151（3） fully mechanized top-coal caving （FMTC） mining face in Xieqiao Mine and based on the analysis of numerical simulation and in-situ observation, the stress distribution and it＇s variation laws were investigated at different coal pillar widths. The results show that not only coal pillars＇ stress distribution laws but also coal entities＇ stress distribution laws are different with coal pillar width, and both stress distributions are displaced. The maintenance situation of gateway was determined on the stress distributions of coal entity and coal pillar, and the appropriate width of coal pillar is less than the critical displacing stress-width.