复杂地质条件下的地下洞室群施工期围岩稳定分析

Surrounding Rock Stability Analysis of Underground Caverns under Complex Geological Conditions during Construction Period

地下洞室群施工建设过程中,特别是复杂地质条件下的地下洞室群,洞室开挖对围岩产生强烈扰动,造成巨大卸荷效应,对围压稳定有较大影响,关系工程的安全。以周宁抽水蓄能电站地下厂房洞室群为依托,从岩体地质条件及洞室布置实际出发,按照施工组织设计需要拟定的分层开挖及支护方案,对地下洞室群建立三维模型,采用弹塑性有限元法进行数值计算,研究设计方案下围岩的稳定性以及支护措施有效性。

During the construction of underground caverns,especially in complex geological conditions,the excavation of underground caverns has a strong disturbance on surrounding rock,which results a huge unloading effect.This problem has a great impact on the stability of confining pressure and is related to the safety of project.Taking the excavation of underground caverns in Zhouning Pumped-storage Power Station as study object,the 3D model of underground caverns is constructed based on the geological conditions,actual layout of caverns and designed layered excavation and supporting scheme,and the elastic-plastic finite element method is used to perform numerical calculations to verify the stability of surrounding rock under design scheme and the effectiveness of support measures.