深部高应力软岩巷道支护技术研究

Research on Support Technology of Deep High Stress Soft Rock Roadway

为了克服深部高地应力作用下巷道围岩变形破坏严重的问题,以瓮福磷矿白岩矿区大塘矿段矿区深部运输巷道为工程背景,分析了巷道变形特征和变形影响因素,研究了黏聚力和内摩擦角对巷道围岩强度的影响。结果得出,黏聚力越大岩体塑性区半径和塑性区位移越小,内摩擦角值对岩体塑性区半径和塑性区位移影响较小;提出了“喷射混凝土+注浆锚杆+锚杆+注浆锚索+锚索”的“双拱协同”加固技术,并通过数值模拟和现场工业试验验证了加固技术的可行性,为解决类似工程难题提供了有效途径。

In order to overcome the serious deformation and failure of roadway surrounding rock under the action of deep high ground stress,taking the deep transportation roadway in Datang mining area of Bai⁃yan mining area of Wengfu Phosphate Mine as the engineering background,the deformation characteristics and influencing factors of roadway are analyzed,and the influence of cohesion and internal friction angle on the strength of roadway surrounding rock is studied.The results show that the larger the cohesion of the rock mass,the smaller the radius of the plastic zone and the displacement of the plastic zone,and the internal friction angle has little effect on the radius of the plastic zone and the displacement of the plastic zone.The"double arch cooperative"reinforcement technology of"shotcrete+grouting bolt+bolt+grouting anchor cable+anchor cable"is proposed,and the feasibility of the reinforcement technology is verified by numerical sim⁃ulation and field industrial test,which provides an effective way to solve similar engineering problems.