Stability analysis for nonhomogeneous slopes subjected to water drawdown

Abstract

Comparing with the homogeneous slope, the nonhomogeneous slope has more significance in practice. The main purpose of the present study is to provide a preliminary idea that how the nonhomogeneity influences the stability of slopes under four different water drawdown regimes. Two typical categories of nonhomogeneity, identified as layered profile and strength increasing with depth profile, are included in the paper, and a nonhomogeneity coefficient is defined to quantify the degree of soil properties nonhomogeneity. With a modified discretization technique, the safety factors of nonhomogeneous slopes are calculated. On this basis, the variation of safety factor with the nonhomogeneity coefficient of friction angle and the water table level are investigated. In the present example, safety factor correlates linearly with friction angle nonhomogeneity coefficient from a whole view and the influences of the water table level on safety factor is basically similar with that in homogeneous condition.

摘要

与均质边坡相比, 非均质边坡对于实际工程中更具意义。本研究着重讨论土体非均质性在四种 水位下降模式下对边坡稳定性的影响。在考虑分层与强度随深度线性增加两类典型非均质性的基础 上, 定义了非均匀性系数以量化土体强度的非均质性程度。采用改进的离散上限分析法, 计算了不同 工况下非均质边坡的安全系数F_s, 研究了F_s 随摩擦角非均匀系数以及水位高度的变化规律。整体上 看F_s 与摩擦角非均匀系数呈线性相关, 而水位对F_s 的影响与均质边坡基本相似。