锦屏一级水电站左岸抗力体基础处理洞室群围岩稳定性分析  

Analysis on Stability of Surrounding Rock of Underground Chamber Group on Left Bank Resisting Rock of Jinping-Ⅰ Hydropower

作　　者：王胜[1] 黄润秋[1] 祝华平[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《探矿工程（岩土钻掘工程）》2009年第9期72-76,共5页Exploration Engineering:Rock & Soil Drilling and Tunneling

摘　　要：通过对锦屏一级水电站左岸抗力体五层洞室岩体结构特征详细调查,采用水电围岩分类的方法对抗力体洞室进行围岩分类。分类结果表明:抗力体洞室围岩以Ⅲ2类围岩居多,占了50%左右,其次为Ⅳ类,占36%左右,Ⅲ1和Ⅴ类围岩所占比例较少。通过对洞室施工开挖失稳破坏现象的调查研究,分析了洞室失稳破坏的机制及破坏形式,认为围岩主要的破坏形式为弱面控制型的块体滑移塌落。对洞室监测资料的分析结果表明,在目前的支护条件下,总体监测未见异常,整体上基础处理洞室监测状态稳定。但F5、F42-9断层及煌斑岩脉等软弱部位应力及变形缓慢增加,需要加强监测。最后根据分析结果提出了建议。By the detailed survey on the structure features of left bank resisting rock of Jinping - Ⅰ hydropower, resisting rock chambers were classified with surrounding rock classification. 50% resisting rock chambers belong to Ⅲ2, about 36% belong to Ⅳ, and the rest belong to Ⅲ 1 and V. By the study on excavating destabilization, analysis was made on the stability-loosing mechanism and the deformation pattern. Weak-plane-controlling block gliding and collapsing were thought to be the main deformation pattern. According to the analysis on the chamber monitoring data, no evidence showed any abnormal; but deformation of F5 , F42-9 faults and lamprophyre dyke were slowly occurred. The paper put forward the construction proposal.

关 键 词：抗力体 围岩分类 破坏机制 块体 监测 稳定性 

分 类 号：TV731.5[水利工程—水利水电工程] TU457[建筑科学—岩土工程]