过断层压气储能巷道围岩变形特征与支护优化

Deformation Characteristics and Support Optimization of Surrounding Rock in Fault-crossing Compressed Air Energy Storage Roadway

目的为解决断层附近储气巷道围岩变形不协调、在储气循环荷载作用下易发生损伤失稳的问题。方法采用FLAC3D建立数值模型,基于淮南潘一矿第一水平西翼轨道石门实际地质条件和原有支护方案,分别开展单一内压荷载作用和循环荷载作用下,储气巷道穿越Fe3正断层附近区域围岩变形破坏特征与支护方案优化模拟分析,针对该区域提出注浆加固方案,并通过数值模拟方法对注浆效果进行考察。结果随着内部储气上限压力的增大,储气库围岩变形加剧。尤其穿越破碎带区域,在循环荷载作用下,围岩累积损伤导致储气巷道极限承载能力大幅度降低,位移增加显著,成为潜在破坏区。注浆后巷道围岩顶底板及两帮位移量明显降低,对储气巷道围岩稳定性具有良好的控制作用。结论研究结果可指导破碎区域注浆加固提高储气巷道内压上限,为同类高压储气巷道的稳定性和安全性提供参考。

Objective In order to solve the problem of uncoordinated deformation of surrounding rock of gas storage roadway near fault and easy damage and instability under cyclic loading of gas storage.Methods FLAC3 D was used to establish a numerical model.Based on the actual geological conditions and the original support scheme of the first horizontal west wing track cross-cut in Panyi Coal Mine of Huainan,the deformation and failure characteristics of the surrounding rock and the optimization simulation analysis of the support scheme were carried out under the action of single internal pressure load and cyclic load,respectively.The grouting reinforcement scheme was proposed for this area,and the grouting effect was investigated with the numerical simulation method.Results With the increase of the upper limit pressure of the internal gas storage,the deformation of the surrounding rock of the gas storage was intensified.Especially through the fracture zone area,under the action of cyclic load,the cumulative damage of surrounding rock led to a significant reduction in the ultimate bearing capacity of the gas storage roadway,and the displacement increased significantly,becoming a potential failure zone.After grouting,the displacement of the roof and floor of the roadway surrounding rock and the two sides was significantly reduced,which had a good control effect on the stability of the surrounding rock of the gas storage roadway.Conclusion The research results can guide the grouting reinforcement in the broken area to increase the upper limit of internal pressure in the gas storage roadway,providing reference for the stability and safety of similar high-pressure gas storage roadways.