金坪子滑坡Ⅱ区堆积体稳定性的二维极限平衡分析

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英文篇名：Two-dimensional Limit Equilibrium Stability Analysis of Jinpingzi Ⅱ Landslide 中文刊名：水电与新能源 英文刊名：Hydropower and New Energy 作者：黄小艳 ; 王汉辉 ; 丁刚 英文作者：HUANG Xiaoyan ; WANG Hanhui ; DING Gang ; Changjiang Institute of Survey ; Planning ; Design and Research 中文关键词：滑坡失稳 ; STAB ; 极限平衡 ; 稳定性计算 英文关键词：landslide instability ; STAB ; limit equilibrium ; stability analysis 出版日期：2015-01-30 机构：长江勘测规划设计研究有限责任公司; 年：2015 期：01 出版单位：水电与新能源

摘要

为分析金坪子滑坡Ⅱ区堆积体的稳定性,运用STAB程序,选取二维极限平衡分析法中的摩根斯坦-普莱斯法(M-P法)分析了Ⅱ区在多种失稳模式下的稳定性,并对影响其稳定性的主要因素进行敏感性分析。计算结果表明:天然状态下,Ⅱ区的稳定系数从前缘至后缘逐渐增大,呈现"松脱式"破坏的特点;影响Ⅱ区稳定性的各因素中,最敏感的是滑带土的内摩擦角和降雨造成地下水位升高,其次是地震作用,再次是滑带土的凝聚力。鉴于降雨造成地下水位升高是滑坡体稳定性下降的主控因素,截排水应该是Ⅱ区防护的首选措施。
The stability of Jinpingzi II landslide in different failure modes is analyzed with the Morgenstern-Price method,which is a two-dimensional limit equilibrium stability analysis method in the STAB program. A sensitivity analysis of the main factors affecting the landslide stability is also carried out. It shows that the stability coefficients of the landslide increase gradually from the front edge to the back edge in natural conditions,which presents a "loose"failure mode. In the factors affecting the landslide stability,the most sensitive factors are the internal friction angle of the slip soil and the rise of ground water level caused by rainfall. And next comes the earthquake action and the cohesion of the slip soil. As the rise of ground water level induced by rainfall is the dominant factor for the landslide stability decreasing,drainage should be the most preferred measure for the landslide control.

引文

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