基于缩小煤柱开采实验的断层带稳定性分析

Analysis of Fault Zone Stability Based on Narrow Coal Pillar Mining Experiment

以龙东煤矿F张断层为基础建立相似材料模型,监测缩小煤柱过程中断层带两侧岩体位移变化规律。实验结果表明:随着断层煤柱宽度的逐渐缩小,断层上盘采空区顶底板垂直位移逐渐增大,距煤层越近位移越大,而下盘位移变化较小;当煤柱宽度减小为30m时,顶板位移发生了突变,同时近断层带两侧上、下盘岩体垂直位移出现明显差异,位移差达0.14m,上盘岩体沿断层带发生明显错动导致断层带的失稳,造成断层"活化",实验结果可为断层煤柱宽度的合理留设提供参考依据。

Similar material simulation model was built based on fault of Longdong coal mine, the rock body displacement variation lawof two sides of fault zone during narrow coal pillar was monitored, the results showed that with the fault coal pillar width decreased,the roof and floorvertical displacement of goaf of upper wall of fault, the displacement increased with the distance to coal seam de-creased, but the displacement of footwall was smaller, when coal pillar width was 30m, the displacement of roof and floor appearedmutation, the vertical displacement of upper and foot wall that close to fault zone appeared obviously difference, the displacementdifference was 0. 14m, fault zone instability was induced by rockmass diastrophism of upper wall, then fault active, the results couldreferenced for similar situation.