姚河坝水电站厂房岩质边坡地震安全性分析  

Study of seismic safety of back powerhouse rock slope of Yaoheba hydropower station

作　　者：张劭华 何蕴龙[1] 孙伟[1] 石熙冉[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2015年第4期483-488,共6页Engineering Journal of Wuhan University

摘　　要：采用三维非线性有限元时程分析方法,结合姚河坝水电站厂房岩质边坡工程实例,在静力分析的基础上对水电站厂房后边坡的动力响应及抗震安全性进行分析.严格考虑了地基辐射阻尼效应,深入模拟锚索、锚杆、基础梁、框架梁、混凝土喷护等边坡加固措施,并详尽模拟了实际施工过程、地质地貌情况等.综合上述因素获得对边坡动力响应的科学评价.研究结果表明,位移、加速度基本上随着高程的升高而增大,应力分布从坡体表层向深部呈现逐层变化的特征.在坡体表面岩体脆弱带处的动力响应较为明显.并基于强度折减法理论,分析得出了边坡在设计地震作用下是安全的.Three-dimensional nonlinear finite element time-history method is carried out to explore the dynamic properties and seismic safety of back powerhouse rock slope of Yaoheba hydropower station based on the static calculation.Considering foundation radiation damping and reinforcing measures strictly,such as anchor cable,anchor,foundation beams,frame beams,concrete spray,etc,and the actual construction progress and geology and so on,are further simulated.Taking all these factors the scientific evaluation of the dynamic characteristics of the slope are obtained.The results demonstrate that：Displacement and acceleration increase basically with the increase of elevation;stress distribution changes from the surface to the depth step by step.The dynamic response is more obvious in fragile rock zone of slope surface.Finally,the slope is safe under earthquake based on the theory of strength reduction.

关 键 词：三维岩质边坡 粘弹性边界 时程分析 动力特性 强度折减法 抗震安全性 

分 类 号：TV697.2[水利工程—水利水电工程]