地堑区工作面断层防水煤柱合理留设研究

Research on Reasonable Retaining of Fault Waterproof Coal Pillars in the Working Face of Graben Area

以阳城煤矿地堑区内1315工作面的地质条件为工程背景,采用FLAC^(3D)数值模拟的方法,对DF53断层在不同落差的情况下,工作面回采对周围岩体的应力场和塑性破坏情况进行分析。结果表明:DF53断层落差越大时,正应力和剪应力越小。两端断层煤柱尺寸越大时,正应力和剪应力越小。结合塑性区变化得到DF53和FD105断层煤柱最小宽度分别约为10 m、5 m时能实现安全开采。

Taking the geological conditions of the 1315 working face in the graben area of Yangcheng Coal Mine as the engineering background,the FLAC~(3D) numerical simulation method is used to analyze the stress field and plastic failure conditions of the surrounding rock mass caused by the working face mining of the DF53 fault under different falls.The results show that the larger the DF53 fault drop is,the smaller the normal stress and shear stress are.The larger the size of fault coal pillars at both ends,the smaller the normal stress and shear stress.By combining the changes in plastic zone,it is obtained the minimum width of DF53 and FD105 fault coal pillars is about 10 m and 5 m respectively,which can achieve safe mining.