综放开采条件下沿空掘巷煤柱留设尺寸数值模拟分析

摘要

In order to improve the stability of the wall rock around the gob-side entry drift and the utilization of coal resources, take Datang-tashan Colliery in Datong mining area as a research object, the reasonable width of segment coal-pillar for the gob-side entry drift in ul-tra-thick coal seam fully mechanized caving face is studied in this paper. The result of numerical stimulation shows that when the width of segment coal-pillar is 5~10 meters, roadway is in the low stress area and the support would be effective. Considering the ground pressure law and the result of microseismic monitoring, taking roadway and gas into account, define the reasonable width of segment coal-pillar.%为了增强沿空掘巷巷道的稳定性，提高资源回采率，本文以大同矿区塔山煤矿8204工作面为研究背景，对沿空掘巷留设区段煤柱的合理宽度进行了研究。通过模拟实验结果得出：区段煤柱的宽度在5~10m时，巷道处于低应力区，支护相对稳定。将理论计算和数值模拟相结合，同时参考塔山矿综放工作面矿压显现规律及微地震监测得出的相关结论，综合考虑巷道跨度大、隔绝采空区瓦斯等安全因素，确定了特厚煤层综放工作面沿空掘巷留设区段煤柱的合理宽度。