某抽水蓄能电站地下洞室群围岩三维稳定分析

某抽水蓄能电站地下厂房为大跨度、高边墙地下洞室群,地质条件复杂,分布软弱夹层,高边墙及洞室间岩体的稳定性是洞室设计的关键因素。根据水压致裂法地应力测试数据计算侧压力系数,构造初始地应力场,按照开挖顺序建立三维弹塑性计算模型,分析地下洞室群围岩应力与变形特征、塑性区分布,评价了地下厂房洞室群围岩稳定性,为洞室设计提供科学依据和基础数据。

3D Stability Analysis on Surrounding Rock for Underground Cavern Group in a Pumped-Storage Power Station

One pumped-storage power station is a typical large-span and high side wall cavern group. The geological condition is complex. The stability analysis of high side wall and the rock is key for cavern design. Base on lateral pressure coefficient calculated by the stress test data gotten with hydraulic fracturing technique, initial stress field is constructed and three-dimensional elastic-plastic model was built according to the construction sequence. The rock stress and deformation characteristics, distribution of plastic zone and integrated stability of rock was evaluated. The study results provide scientific basis and technical advice for caverns design.