断层破碎带在渗流作用下应力特征及控制

The Stress Characteristics and Control of Fault Zone under the Action of Seepage Flow

采用瞬变电磁仪对回风巷穿越断层破碎带的现场水文情况进行探测,获取区域地下水在巷道两帮集聚导致低阻异常区存在的水文特征。建立了回风巷赋水断层三维流固耦合力学模型,模拟分析了断层破碎带在动压及渗流作用下的应力分布及变形特征。研究结果表明:孔隙水压力集中区和巷道两帮压应力集中区具有一致性,随着与断层距离的减小,双场集中区中区由两帮向顶角处转移;回风巷围岩变形失稳概括为3个阶段:即,两帮压密顶底板产生张拉裂隙阶段;地下水向巷道渗透及围岩软化阶段;围岩变形持续增大阶段。为控制回风巷进一步变形,提出了对两帮及底板进行注浆加固的方案。

The hydrological features of the fault fracture zone were detected by using Transient Electromagnetic Meter,the hydrological features of the regional groundwater accumulation in the roadway caused by low resistivity anomaly obtained. On this basis,the 3 D fluid-solid coupling mechanical model of fault fracture zone was established,the hydrological conditions of the fault rupture zone were detected. The return airway’s pore water pressure,rock stress and deformation in the process of crossing the fault fracture zone have been studied. Research shows that pore water pressure concentration is the result of stress concentration of two sides roadway,the distribution of pore water pressure and stress is the same. With the decrease of the distance from the fault,the concentration zone will transfer to the top corner from the side of the roadway. Considering the stress of surrounding rock under the seepage,the deformation process of return air roadway is divided into three stages. That is,the pressure of the two sides and the tension crack of top and floor stage,groundwater flow to the roadway and surrounding rock softening stage,the deformation of surrounding rock continue to increase. According to the results of the numerical simulation and the water cultural relics of the transient electromagnetic meter,the grouting reinforcement scheme is proposed.