近距离孤岛工作面动压影响巷道围岩控制

A Surrounding Rock Controlling Technique of Roadway Affected by Dynamic Stress in "Islet Face"of Adjacent Coal Seam

近距离煤层孤岛工作面上部煤层与下部煤层回采巷道为楼上楼形式时,下部煤层回采巷道的维护十分困难.结合付村矿209孤岛工作面工程地质实际条件,运用三维数值模拟软件FLAC3D,分析了此种情况下,影响下部煤层回采巷道围岩稳定性的主要因素.通过对3上煤层开采影响下3下巷道围岩的位移与应力分析研究,指出孤岛工作面楼上楼巷道围岩极不稳定,在动压影响下极易产生形变,其中水平应力对巷道围岩的影响比垂直应力更大.在此基础上提出了控制巷道围岩的空间斜拉锚索的支护方案.

The influence of dynamic stress on the roadway under overhead mining is acute in adjacent coal seams, especially when the roadways are overlapped. Based on the mining geological conditions of a long-wall mining panel, the main factors influencing on the stability of roadway in the lower coal seam were analyzed by means of 3D coupled numerical modeling. The rock＇s stress and displacement were studied. The results show that the surrounding rock of roadway in lower coal seam is extraordinary instability and can easily distort under the dynamic stress; the impact of horizontal stresses are much greater than that of vertical stresses; and the support scheme of the roadway in lower coal seam was advanced.