基于强度折减法的非均质多级边坡稳定性分析

基于强度折减法,运用有限元分析软件ADINA建立非均质多级边坡计算模型并进行数值模拟。结合边坡各计算工况的安全系数和塑性区范围,分析了边坡级数、平台宽度以及单级坡率等因素对边坡稳定性的影响。结果表明:增加边坡级数、平台宽度或放缓坡率可有效提高边坡的稳定性;增加边坡级数和放缓下级边坡坡率,可将边坡整体破坏分解为局部破坏;边坡平台设在中下部对边坡稳定性更有利;若改变单个平台宽度或单级坡率,增加下部平台宽度和降低下级边坡坡率对提高边坡稳定性更显著。

Stability Analysis of Inhomogeneous and Multi-step Slope Based on Strength Reduction Method

Based on strength reduction method, a numerical model of inhomogeneous and multi-step slope was established by using finite element software ADINA. According to the safety factor and plastic zone of the slope in different calculation conditions, the effect of the slope steps, platform width and slope ratio on the stability of the slope were analyzed. The results showed that: increasing slope steps and platform width, or decreasing slope ratio can effectively improve the slope stability; the global failure of the slope is disassembled into local failure with the increase of slope steps and decrease of the lower slope ratio; the platform placed on middle-lower region has more advantages to enhance the slope stability. In addition, if single-step platform width or slope ratio is changed, the slope stability increases significantly with the increase of the lower platform width and decrease of the lower slope ratio.