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通过现场地质调查和监测,确立灵湖金矿330工程450巷道围岩体地质模型,查明硐室在受低地应力状态下的围岩等级,巷道围岩变形破坏程度及松动圈范围。针对硐顶掉(落)石块典型破坏类型,采用离散元UDEC软件进行数值模拟分析,反演硐室开挖后应力重分布,顶板产生拉应力区,导致围岩体发生变形破坏的过程和力学机制,并采取预应力锚杆支护措施稳固失稳岩体。
Through on-site geological survey and monitoring, the geologic model of surrounding rock mass of laneway No. 450 of Linghu Gold Mine 330 was established. The grade of surrounding rock in tunnel under low ground stress, the degree of deformation and failure of surrounding rock of tunnel and the range of loose ring were ascertained. Aiming at the typical types of rock failure, the discrete element UDEC software was used to carry out numerical simulation analysis. After stress analysis, the stress redistribution was induced in the cavern excavation and the tensile stress zone was generated in the roof, which led to the deformation and failure of the surrounding rock mass. Mechanics, and take prestressed bolt support measures to stabilize the unstable rock mass.