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深部资源开发中地下洞室围岩稳定控制必须面对峰后碎裂岩体的变形和破坏问题,目前深部多裂隙岩体开挖强卸荷引起的围岩变形破坏规律尚不清楚,常导致大体积塌方、大变形等重大工程事故。采用大尺度三维模型相似试验系统,分析具有一定倾角的多组裂隙的岩体在高地应力下开挖变形破坏规律。试验结果表明:隧道上下侧围岩主要呈现大变形现象,左右侧围岩呈现分层破裂现象,破裂区随时间增长由内向外逐渐增多,在拱顶、底板大变形的诱导下发生边墙大体积坍塌;隧道围岩由内向外位移值和应力值呈现波动状分布;裂隙倾角与破坏区分布形态有一定相关性。为保障深部工程的安全兴建与运营提供了试验基础。
The stability control of surrounding rock in underground caverns during the development of deep resources must face the deformation and failure of post-peak fractured rock mass. The law of deformation and failure of surrounding rock caused by strong unloading of deep multi-fractured rock masses is not clear, Large-scale landslides, major deformation and other major accidents. A large-scale three-dimensional model similarity test system is adopted to analyze the deformation and failure of rock mass under multi-group fractures with a certain inclination under high ground stress. The test results show that the surrounding rock at the upper and lower sides of the tunnel mainly shows large deformation, and the surrounding rocks on both the left and right sides show the phenomenon of delamination and rupture. The rupture zone gradually increases from the inside to the outside with the time increasing. Volume collapse; tunnel surrounding rock from the inside and outside the displacement values and stress values showed a wave-like distribution; fracture angle and the destruction of the distribution of regional distribution has some relevance. It provides experimental basis for safe construction and operation of deep engineering.