工作面坚硬顶板破断冒落分析及预裂高度优化

Analysis of Hard Roof Breaking and Caving in Working Face and Optimization of Pre-splitting Height

针对工作面坚硬顶板大面积悬顶后突然垮落而引发安全事故等问题,以经坊煤矿3-606工作面为研究背景,通过数值模拟及现场实践的方法,利用3DEC数值模拟软件模拟不同预裂高度对顶板的压裂效果,对比不同预裂高度下顶板垂直应力和垂直位移的变化规律。结果显示:工作面顶板预裂高度为22 m时,煤层顶板受到的垂直应力相对较小,垂直位移量最大,所以顶板最佳预裂高度为22 m。现场实践证明,合理的预裂参数设计能够有效控制巷道围岩。

Aiming at the problems of safety accidents caused by sudden collapse of hard roof after large-scale suspension of hard roof in working face,taking 3-606 working face of Jingfang coal mine as the research background,through numerical simulation and field practice,3DEC numerical simulation software is used to simulate the fracturing effect of different pre-splitting heights on roof,and the variation law of vertical stress and vertical displacement of roof under different pre-splitting heights is compared.The results show that when the pre-splitting height of the roof of the working face is 22 m,the vertical stress on the roof of the coal seam is relatively small,and the vertical displacement is the largest,so the best pre-splitting height of the roof is 22 m.The field practice proves that the reasonable pre-splitting parameter design effectively controls the surrounding rock of the roadway.