多因素耦合的膨胀土边坡稳定性分析

Expansive soil slope stability analysis affected by many factors

基于膨胀土边坡具有浅层破坏的特点,普通的边坡稳定性分析方法往往不能满足其稳定性分析的需要。分析裂缝的发展,土体的非饱和性以及膨胀力对其稳定性的影响。针对不同因素,提出相应的计算方法。将膨胀土边坡的稳定性问题转化为3个滑动模式下的极限平衡问题,并通过室内试验,将非饱和状态下的强度参数及膨胀力表示为土体含水率的函数。在此基础上,提出考虑多种因素的膨胀土稳定性分析方法。利用已有膨胀土的边坡的资料,对某工程实例进行分析,研究结果表明:该方法能够适用于膨胀土边坡稳定性的分析。

The failure of expansive slope often occurs in superficial layer, thus the common stability method couldnot satisfy the need of expansive soil slope stability analysis. The influence of crack development, unstauration and swelling forces on slope stability was analyzed and the corresponding calculation methods for each influence factor were proposed. The problem of expansive slope soil stability ean be solved by limit equilibrium in three sliding models. The strength parameters in unstauration condition and swelling forces were expressed as the function of moisture content through laboratory test. On this basis, the stability analysis approach affected by many factors was proposed. Using data of existing expansive slope, stability of a practical engineering was analyzed. The results show that this proposed method is suitable for the stability analysis of expansive soil slope.