富水泥化巷道渐变破坏机理与局部失稳控制技术

Support Failure Mechanism and Local Instability Control Technology of Rich Water Mudding Roadway

针对祁东煤矿南翼运输石门围岩富水泥化难以维护的问题,采用工程地质调研、数值模拟、现场实测方法对巷道支护失效机理和支护方案进行了分析。结果表明南翼运输石门的支护失效机理是泥质围岩弱化效应和岩石流变渐进破坏作用;为改善围岩自身承载能力,实施了"锚网索注"联合支护方案。数值模拟与工程实践表明,实施锚网索注联合支护后,与原锚网喷支护方式相比,巷道围岩变形量平均缩减55.75%,对富水泥化巷道稳定性控制效果显著。

Aiming at the support failure problem in rich water mudding roadway, the comprehensive research methods such as engineering geological investigation, numerical simulation and field measurement are adopted to analyze support failure mechanism and supporting schemes for the transportation cross heading roadway in southern mining area of Qidong Coal Mine. The results show that the support failure mechanism of the transportation cross heading roadway is mainly argillaceous weakening and rock rheology. In order to improve the self-bearing capacity of surrounding rock, the combined supporting scheme of＂high strength and large elongation rate of anchors ＋ intermittent short grouting＂is proposed. The results of the numerical simulation and the engineering practice reveal that after applying the optimization of ＂high strength and large elongation rate of anchors ＋ intermittent short grouting＂, compared with the original supporting scheme, the convergence of roadways is reduced by 55.75%, the effect on controlling large deformation of surrounding rocks in mudding roadway is remarkable.