大型地下洞室群开挖围岩损伤演化特征研究  

Damage evolution characteristics of rock mass subjected to excavation in large-scale underground caverns

作　　者：廖果 马建 李小强 税政文 毛浩宇 Liao Guo;Ma Jian;Li Xiaoqiang;Shui Zhengwen;Mao Haoyu(Third Bureau of Sinohydro Bureau 7 Co.,Ltd.,Chengdu 611730,China;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]中国水利水电第七工程局有限公司第三分局,四川成都611730 [2]四川大学,水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《山西建筑》2022年第18期152-156,共5页Shanxi Architecture

基　　金：四川省杰出青年科学基金(No.2020JDJQ0011)。

摘　　要：以猴子岩水电站地下厂房为研究对象,采用RFPA强度折减法,研究深埋地下洞室群开挖卸荷过程围岩损伤演化特征,揭示围岩失稳破坏的整个过程。结果表明,地下厂房第Ⅴ层~第Ⅵ层开挖诱发断层活动,声发射数量和能量释放最多,围岩损伤严重,主要的损伤区位于主厂房下游侧的多个断层及其交汇处。洞室开挖完成后,随着围岩强度折减,主厂房下游侧断层位置损伤扩展,形成多断层控制的潜在失稳滑动面。微震监测揭示的主要损伤区域与RFPA模拟计算得到的潜在失稳区域基本一致。研究结果可作为地下厂房开挖和支护的重要参考。The RFPA-strength reduction method is used to study the damage evolution characteristics of rock mass and reveal the unstable process subjected to excavation of the underground powerhouse caverns in Houziyan hydropower station.The results indicate that rock mass damage is severe during theⅤ~Ⅵbench excavation.The activations of faults results in a large amount of acoustic emissions and energy release.The main damage zone is located in the fault areas of the downstream underground powerhouse.After the excavation is completed,the rock mass damage scope of fault areas extends and forms fault-controlled potential slide surface.The microseismic data match up well with the numerical simulation results and provide significant references for excavation and support of the underground powerhouse caverns.

关 键 词：地下洞室群 开挖 围岩损伤 RFPA 微震监测 

分 类 号：TU941[建筑科学—建筑技术科学]