用强度折减方法分析重力坝深层抗滑稳定性  

Analysis on the deep anti-sliding stability of concrete gravity dam foundation by FLAC strength reduction method

作　　者：于沭[1] 陈祖煜[1] 王玉杰[1] 段庆伟[1] 贾志欣[1] 

机构地区：[1]中国水利水电科学研究院岩土工程研究所,北京100044

出　　处：《水文地质工程地质》2009年第3期64-70,共7页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金重点项目(50539100);中国水利水电科学研究院专项基金(岩集0813)

摘　　要：目前,对重力坝深层抗滑稳定的分析方法尚无统一和明确的规定。强度折减方法在求解安全系数方面具有不用指定滑面、自动搜索滑裂面等优点。本文基于FLAC软件,采用强度折减方法对分属三种典型地质条件的多个算例进行分析。分析结果表明,无论采用相关联还是非相关联流动法则,采用强度折减方法得到的安全系数与Morgenstern-Price方法求解的安全系数都相差较小,误差小于5%,且采用相关联流动法则时得到的安全系数误差更是小于3.5%。根据在破坏时坝基塑性区的分布,提出了确定滑裂面的方法,该方法确定的滑裂面与M-P方法搜索到的滑裂面有很好的一致性。本文通过多个算例的分析证明基于FLAC软件的强度折减方法是一种可靠、有效的方法,可以应用于分析重力坝深层抗滑稳定性。通过对向家坝水电站泄12坝段的深层抗滑稳定分析表明该方法可以应用到重力坝深层抗滑稳定的工程分析中。There is no specific method which was widely used to analyze the deep anti-sliding stability of concrete gravity dam. The strength reduction method as a method to calculate the Factor of Safety （FOS） has many advantages on searching slide surface. 75 examples of three typical geologic conditions were analyzed by the FLAC combined with strength reduction method and Morgenstem-Price method. The result shows that the errors of FOS obtained by FLAC strength reduction method and by M-P method are all below 5% and even smaller below 3.5% when associated flow rules are adopted in FLAC. A method to make sure the slide surface was obtained from the series of studies. The results in this paper indicate that the FLAC strength reduction method applied in the analysis of Xiangjiaba hydropower station is a new method which is reliable and feasible on the analysis on deep anti-sliding stability of concrete gravity dam.

关 键 词：重力坝深层抗滑稳定 强度折减 滑裂面 FLAC 向家坝水电站 

分 类 号：TV223.21[水利工程—水工结构工程]