土石坝抗震稳定性分析的极限平衡水平条分法  

Quasi-static Limit Equilibrium Horizontal Slice Method for Seismic Stability Analysis of Earth-Rock Dam

作　　者：沈振中[1,2] 崔娟[2] 任华春[2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学水利水电学院,江苏南京210098

出　　处：《南水北调与水利科技》2011年第3期145-149,166,共6页South-to-North Water Transfers and Water Science & Technology

基　　金：高坝深层抗滑稳定性评估技术(国家科技支撑计划课题2008BAB29B03);水利工程病变机理与健康诊断(河海大学水文水资源与水利工程科学国家重点实验室专项基金2009586012);江苏高校优势学科建设工程资助项目

摘　　要：在土石坝的抗震稳定分析中常采用拟静力法。地震动态分布系数沿坝高呈非线性分布,因而采用竖向条分法将造成水平惯性力计算误差,在分析产生误差机理的基础上,尝试将极限平衡水平条分法应用于土石坝抗震稳定分析中。根据极限平衡法的基本原理,推导了满足力和力矩平衡的水平条分法计算公式。运用0.618多变量轮换优选法,实现了坝体边坡分层自动搜索最危险滑动面。算例分析表明,极限平衡水平条分法对于土石坝抗震稳定分析更为合理,其计算结果可以为土石坝的抗震稳定分析提供参考依据。The quasi-static force method is often used in seismic stability analysis of earth-rock darn. Because of the nonlinear distribution of seismic dynamic distribution coefficient, the adoption of vertical slice method to calculate horizontal inertia force will cause errors. In this paper, based on the analysis of the error mechanism, the limit equilibrium horizontal slice method is applied to analyse the seismic stability of the dam. In accordance with the basic principle of limit equilibrium method, the formula of limit equilibrium method is derived, which can meet the force and moment balance. In searching the critical surface, 0. 618 optimiza- tion method of variable exchange is applied, this method can realize stratified search automatically. The results show that limit equilibrium horizontal slice method is more reasonable, and the calculation results can provide reference for seismic stability analysis of earth-rock dam.

关 键 词：土石坝 拟静力极限平衡法 竖向条分法 水平条分法 危险滑动面 

分 类 号：TV312[水利工程—水工结构工程]