回采巷道锚杆索支护优化设计与应用

Optimization Design and Application of Anchor Rod Cable Support in Mining Roadway

针对山西长平煤矿2302工作面掘巷完成后,回采时采动压力剧增,巷道锚杆支护不能满足安全开采要求的问题,从岩体内部构造与岩层压力传递角度分析了巷道变形失稳机理,以巷道顶板和帮部变形失稳特点剖析了巷道变形破坏特征,通过锚杆锚索的岩体改性性质阐明了锚杆锚索作用机理。结合实际地质情况,对2302工作面回采巷道锚网索支护进行优化设计,通过FLAC^(3D)数值模拟软件计算对比分析了巷道支护方案优化前后的顶板垂直位移与岩体塑性破坏区范围,确定了支护方案优化后的支护效果更佳。现场工业性试验与巷道实时垂直位移监测得出优化后的支护方案巷道垂直方向变形量最大82 mm,最小49 mm,巷道支护方案优化效果良好,具有很好的可行性。

In view of the problem that after the completion of roadway excavation in the 2302 working face of Changping Coal Mine in Shanxi Province,the mining pressure increases sharply during mining,and the anchor rod support of the roadway can not meet the requirements of safe mining,the deformation and instability mechanism of the roadway is analyzed from the point of view of internal structure of the rock body and rock layer pressure transmission.The deformation and damage characteristics of the roadway are analyzed based on the deformation and instability characteristics of the roadway roof and side.The mechanism of the action of the anchor rod and anchor cable is elucidated through the rock body modification properties nature of the anchor rod and anchor cable.Based on the actual geological conditions,optimize the design of anchor mesh and cable support for the 2302 working face mining roadway.The vertical displacement of the roof and the range of plastic damage zone of the rock body before and after the optimization of the roadway support scheme are calculated compared and analyzed using FLAC^(3D)numerical simulation software,and it is determined that the optimized support scheme has a better support effect.Through the on-site industrial test and the real-time vertical displacement monitoring of the roadway,it is concluded that the maximum vertical direction deformation amount of the roadway is 82 mm and the minimum is 49 mm.The optimization effect of the roadway support scheme is good and has good feasibility.