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采用离散单元法,对节理岩体中地下洞室考虑随机节理空间分布的围岩稳定性进行数值分析。分析结果显示不同的节理裂隙分区,块体失稳破坏的位置和深度明显不同;对围岩施加锚喷系统支护后,由于支护结构对围岩的约束作用,围岩变形和破裂深度受到明显抑制,地下洞室实际施工中应根据数值分析所揭露的块体失稳部位和破裂深度提高洞室相应部位支护强度,采取相应工程措施,确保施工期及地下洞室永久安全。随着地下洞室施工,现场揭露的的工程地质信息的进一步充实,完善分析模型,可以较准确的预测洞室围岩块体失稳破坏区域,从而为现场的动态设计及施工提供依据。
Discrete element method is used to analyze the stability of surrounding rock considering the spatial distribution of random joints in underground caverns in jointed rock mass. The analysis results show that the locations and depths of the instability and failure of the blocks are obviously different for different sections of the joint and fissures. After the support of the surrounding rock is applied to the anchoring and spraying system, the deformation and rupture depth of the surrounding rock are affected by the restraining action of the support structure to the surrounding rock Obvious inhibition, the actual construction of underground caverns should be based on numerical analysis of the block instability sites and rupture depth to improve the corresponding parts of the caverns supporting strength, take appropriate engineering measures to ensure that the construction period and underground cavern permanent safety. With the construction of underground caverns, the engineering geological information disclosed in the field is further enriched and the analysis model is improved, which can accurately predict the destabilized and damaged area of the surrounding rock mass in the cavern so as to provide the basis for the dynamic design and construction of the site.