DDA强度折减法及其在东苗家滑坡中的应用  

Strength reduction of DDA and its application in Dongmiaojia landslide

作　　者：王小波[1] 徐文杰[1] 张丙印[1] 应敬浩[2] 

机构地区：[1]清华大学水利水电工程系,水沙科学与水利水电工程国家重点实验室,北京100084 [2]黄河勘测规划设计有限公司,郑州450003

出　　处：《清华大学学报（自然科学版）》2012年第6期814-820,共7页Journal of Tsinghua University(Science and Technology)

基　　金：国家“九七三”重点基础研究项目(2110CB732103);国家自然科学基金青年基金资助项目(51109117);清华大学自主科研计划(20111081125)

摘　　要：为了分析滑坡的稳定性以及预测滑坡的失稳模式,该文在DDA(discontinuous deformation analysis)方法以及强度折减法研究的基础上,提出了DDA强度折减法。通过对西北某黄土高边坡的算例分析验证所提出的方法。验证结果表明:DDA强度折减法计算所得稳定系数为1.20,与极限平衡法计算结果一致,且其潜在的滑动面也相近。在此基础上,该文将DDA强度折减法应用于小浪底水利枢纽近坝区的东苗家滑坡稳定性及破坏模式分析中。分析结果表明:东苗家滑坡体的稳定系数为1.07;其可能的破坏模式为中部推移式滑动和后缘牵引式滑动的复合破坏模式,前缘滑塌体对其整体稳定性起支撑作用。The strength reduction method of the discontinuous deformation analysis （DDA） method is used to study landslide stability and to forecast landslide failure modes. The method is verified for a high loess slope in Northwest China. The results show the slope stability coefficient calculated by the strength reduction method is 1.20 which is consistent with the result calculated by the limit equilibrium method and the potential sliding surfaces predicted by the two methods are similar. The method i.s then used to study the stability and failure mode of the Dongmiaojia landslide near the dam of the Xiaolangdi Hydraulic Project. The results indicate that the slability coefficient of the Dongmiaojia landslide was 1.07 and the failure modes may he a combination of pushing sliding in the middle part and traction sliding of the rear edge with the front slump mass playing a support role to the stability.

关 键 词：滑坡稳定性 强度折减法 极限平衡法 DDA(dis-continuous DEFORMATION analysis)方法 失稳模式 

分 类 号：TU457[建筑科学—岩土工程]