某水电站导流洞入口边坡开挖稳定性分析  

Stability Analysis on the Diversion Tunnel Outlet Slope of a Hydropower Station

作　　者：杨国俊[1] 王亮清[1] 谭维佳[1] 

机构地区：[1]中国地质大学工程学院,武汉430074

出　　处：《安全与环境工程》2012年第5期111-114,共4页Safety and Environmental Engineering

基　　金：国家重点基础研究发展规划项目(2011CB710600);国家自然科学青年基金项目(40702050);中央高校基本科研业务费专项资金项目(CUG090104)

摘　　要：某水电站导流洞处于高山峡谷区,洞室开挖只是影响6倍洞径范围内围岩应力重分布状态,对边坡整体稳定性影响不大,但边坡开挖将切除一部分可支撑边坡的坡脚岩体,会产生较大的不利影响。本文就该边坡开挖过程中的稳定性问题进行了数值模拟,并对边坡开挖过程中的最大不平衡力、位移变形、应力状态、稳定系数等进行了监测与分析,得出边坡天然工况下有局部失稳的可能性。该研究可为该边坡的工程设计提供依据,也对类似工程具有借鉴作用。The diversion tunnel of a hydropower station is located in a mountain valley area. Underground excava- tion will mainly affect the stress distribution in the range which is 6 times of the diameter of the chamber for the surrounding rock, so it has little effect on the overall stability of the slope. But slope excavation will remove part of the support rock mass, so it will lead to the greater negative impact on slope stability. Based on the stability prob- lems which may occur in the process of slope excavation,this paper uses numerical simulation to analyze the rele- vant indexes of the slope during excavation such as maximum imbalance force, displacement, deformation, stress state and stability factor, and concludes that there exists the possibility of slope instability in natural slope work case,which provides a basis for engineering design and a reference for similar projects.

关 键 词：边坡 数值模拟 稳定性分析 位移监测 稳定系数 

分 类 号：TU457[建筑科学—岩土工程]