大岗山水电站地下厂房洞室群变形稳定性分析  

Analyses on the deformation stability of surrounding rock mass of the underground powerhouse chamber group at the Dagangshan hydropower station

作　　者：董淑乾[1] 魏云杰[2] 许模[1] 唐世强[1] 

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,成都610059 [2]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100022

出　　处：《水文地质工程地质》2009年第5期31-34,共4页Hydrogeology & Engineering Geology

基　　金："十一五"国家科技支撑计划项目资助(2006BAJ05A02;2006BAJ27B05)

摘　　要：在岩体质量综合分级和岩体结构模型概化的基础上,运用有限元系统研究了大渡河大岗山水电站地下厂房洞室群开挖完成后围岩的应力场、变形场和塑性破坏区的分布和变化特征。洞室开挖后,在其周围的角顶部位均出现不同程度的应力集中,洞室周边均存在塑性区,以拉张破坏为主,建议开挖的同时采取适当的支护措施,为洞室群稳定性评价和工程施工设计提供了依据。On the basis of rock mass quality evaluation and model summarized, finite element numerical modeling technique is used to systematically analyze the distribution of stress filed, strain field and plastic zone in the surrounding rock mass of the underground cavities after excavation in the Dagangshan hydropower station. After the underground cavities excavation, stress concentration of varying degrees appear around the comer of cavities, and some plastic zones exist around the cavities, which are mainly extensional damage. It is proposed taking appropriate support measures when excavating. The main results can be taken as the basic data and the theoretical proofs to evaluate cavities stability and guide correct excavation.

关 键 词：地下厂房洞室群 岩体质量 围岩稳定 有限元模拟 

分 类 号：TU457[建筑科学—岩土工程]