断层对煤层回采的影响模拟研究

Simulation Study on the Influence of Faults on Coal Seam Mining

为研究煤矿工作面回采过程中断层对煤层围岩的影响程度,以昌恒煤矿9102工作面外段某正断层为例,利用Flac3D软件模拟断层上、下盘煤层工作面的推进过程,通过对模拟结果进行对比分析确定断层对煤层工作面回采时围岩的影响情况。结果发现:对于9102工作面,断层对上盘回采过程影响更大,但影响距离短;对下盘回采过程影响更早,影响长度更长;回采过程中围岩底板位移量普遍小于顶板,但塑性破坏区要略大于顶板围岩。根据模拟结果,在工作面与断层之间预留合适长度的煤柱可以提高回采安全性。

In order to study the impact of the interruption layer on the surrounding rock of the coal seam in the mining process of the coal seam working face, taking a normal fault in the outer section of 9102 working face of Changheng coal mine as an example, Flac3D software is used to simulate the advancement process of the coal seam working face in the upper and lower walls of the fault, through the comparative analysis of the simulation results, the influence of faults on the surrounding rock of coal seam working face is determined. The results show that for 9102 working face, the fault has a greater impact on the hanging wall mining process, but the impact distance is short;it has an earlier impact on the footwall mining process and a longer impact length;during mining, the displacement of surrounding rock floor is generally less than that of roof, but the plastic failure area is slightly larger than that of roof surrounding rock. According to the simulation results, reserving a suitable length of coal pillar between the working face and the fault can improve the mining safety.