非饱和参数交互作用的边坡稳定性分析

为研究降雨入渗条件下的边坡稳定性,提出一种基于流固耦合理论及非饱和渗流参数敏感性分析的边坡稳定性分析方法.边坡的非饱和参数交互作用影响边坡稳定,为此,建立基于有限元方法的边坡非饱和渗流的边坡稳定性分析模型.构建了边坡稳定性分析参数敏感性分析模型,分析了非饱和参数对边坡稳定特征的直接作用和耦合交互作用.结果表明:降雨入渗时的非饱和参数共同作用下,降雨强度和渗透系数对边坡稳定性孔压及饱和度特征的直接影响和间接影响较内摩擦角和黏聚力更为明显.降雨强度对特征单元位移直接影响最大,内摩擦角与其他参数的耦合作用最显著.黏聚力对边坡稳定的直接影响最大,且对塑性变形作用时与内摩擦角、降雨强度及饱和渗透系数的耦合最为紧密.非饱和参数共同变化时,交互作用不是单项参数的作用效果直接叠加.

Slope Stability Analysis Based on Interaction of Unsaturated Parameters

This paper propose a slope stability analysis method based on the fluid solid coupling theory and the sensitivity analysis of unsaturated seepage parameters for study the slope stability under the condition of rainfall infiltration. The interaction of unsaturated parameters affects the slope stability, therefore, the slope stability analysis model of unsaturated seepage based on the finite element method is established. The sensitivity analysis model of slope stability analysis parameters is established, and the direct and coupling interaction of unsaturated parameters on slope stability characteristics are analyzed. The results showed that the direct and interaction influence of rainfall intensity and permeability coefficient on the pore pressure and saturation characteristics of slope stability is more obvious than that of internal friction angle and cohesion under the under the interaction of unsaturated parameters during rainfall infiltration. The displacement of the feature element is extremely affected by rainfall intensity, and the interaction effect of the internal friction angle and other parameters is the most significant. The cohesion has the most direct influence on the stability of the slope, and it is most closely related to the angle of internal friction, rainfall intensity and saturated permeability coefficient that affect the plastic deformation. The interaction effect is not the direct superposition of single parameters when the unsaturated parameters changes synchronously.