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裴书锋, 江权, 樊义林, 李晓轩, 段杭. 高应力大直径圆筒形洞室围岩变形破坏特征与失效机制[J]. 岩土工程学报, 2023, 45(1): 171-180. DOI: 10.11779/CJGE20220214
引用本文: 裴书锋, 江权, 樊义林, 李晓轩, 段杭. 高应力大直径圆筒形洞室围岩变形破坏特征与失效机制[J]. 岩土工程学报, 2023, 45(1): 171-180. DOI: 10.11779/CJGE20220214
PEI Shufeng, JIANG Quan, FAN Yilin, LI Xiaoxuan, DUAN Hang. Deformation characteristics and failure mechanism of surrounding rock of high-stress large-diameter cylindrical caverns[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(1): 171-180. DOI: 10.11779/CJGE20220214
Citation: PEI Shufeng, JIANG Quan, FAN Yilin, LI Xiaoxuan, DUAN Hang. Deformation characteristics and failure mechanism of surrounding rock of high-stress large-diameter cylindrical caverns[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(1): 171-180. DOI: 10.11779/CJGE20220214

高应力大直径圆筒形洞室围岩变形破坏特征与失效机制

Deformation characteristics and failure mechanism of surrounding rock of high-stress large-diameter cylindrical caverns

  • 摘要: 针对高应力大直径圆筒形洞室出现的岩爆、喷层开裂和钢绞线弹出等变形破坏现象,通过现场破坏调查、岩体位移和锚索应力监测,详细说明了围岩变形破坏的发展演化过程,并通过钻孔摄像观测了围岩内部破裂特征,进而总结了围岩变形破坏的演化模式。通过数值模拟揭示了洞室围岩变形破坏机制,并提出了合理的支护建议。高应力大直径圆筒型洞室变形破坏是一个链动灾害过程,围岩内部开裂导致了岩体位移和锚索荷载增加,锚索荷载超限时钢绞线断裂弹出,失去约束的洞壁围岩和喷层在卸荷作用下鼓胀开裂。高初始地应力和开挖后诱发的应力集中,玄武岩起裂强度低,临近洞室开挖诱发应力叠加,应力集中区支护强度较弱等综合因素导致了围岩内部开裂的产生。在洞室围岩应力集中区设置足够的预应力长锚索和合理的张拉力,可以有效减弱围岩内部破裂深度和程度。

     

    Abstract: Aiming at the deformation and damage phenomena such as rock burst, spray layer cracking and steel strand ejection in high-stress large-diameter cylindrical caverns, the development and evolution process of deformation and damage of the surrounding rock is explained through field investigation, observation of displacement of rock mass and stress of anchor cable. The internal fracture characteristics of the surrounding rock are observed through borehole camera, and the evolution mode of the deformation and failure of the surrounding rock is summarized. The deformation and failure mechanism of the surrounding rock of the cavern is revealed through numerical simulation, and reasonable support suggestions are put forward. The deformation and failure of the high-stress large-diameter cylindrical caverns is a chain-driven disaster process. The internal cracking of the surrounding rock leads to the increase in the displacement of the rock mass and the load of anchor cable. The steel strands break and pop out when the load of anchor cable exceed the limit. The surrounding rock and sprayed layer of unconstrained cave wall bulge and crack under the action of unloading. The high initial ground stress and the stress concentration induced after excavation, the low crack initiation strength of basalt, the superposition of stress induced by excavation adjacent to the cavern, and the weak support strength in the stress concentration areas lead to the occurrence of internal cracking in the surrounding rock. Setting enough pre-stressed long anchor cables and reasonable tension force in the stress concentration areas of the surrounding rock of the cavern can effectively reduce the depth and degree of internal fracture of the surrounding rock.

     

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