杨房沟水电站地下厂房围岩稳定分析

杨房沟水电站地下厂房是典型的大跨度、高边墙地下洞室群，工程区地质条件较复杂，高边墙及洞室间岩柱的稳定性是洞室设计的关键。根据地应力测试数据，采用边界位移条件回归方法，构造出厂区初始地应力场。采用FLAC3D软件对洞室群围岩稳定进行计算分析，获得洞周围岩变形与应力特征、塑性区分布及支护结构的受力状态，对地下厂房洞室群围岩稳定性做出评价，为洞室设计提供了科学依据与技术指导。

STABILITY ANALYSIS OF SURROUNDING ROCKS OF UNDERGROUND POWERHOUSE IN YANGFANGGOU HYDROPOWER STATION

The underground powerhouse of Yangfanggou hydropower 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 pillar between caverns is key for cavern design. Based on in-situ test data，using boundary displacement condition regression method，the initial geostress field is constructed. The stability of surrounding rock of underground caverns is analyzed by FLAC3D. The deformation and stress characteristics，plastic zone distribution field and force of support are obtained. The integrated stability of underground powerhouse is evaluated. The study results provide scientific basis and technical advice for caverns design.