基于统一强度理论的非饱和土斜坡稳定性分析

基于双剪统一强度理论与非饱和土抗剪强度公式,结合Sarma法的思想,推导考虑中间主应力效应和条间基质吸力的非饱和土斜坡稳定性计算公式,并将其应用于工程实例进行验证。结果表明,非饱和土斜坡稳定性系数与中间主应力参数b和基质吸力成正相关关系,二者均对斜坡的稳定性产生贡献;与传统方法相比,在基质吸力等于50kPa时,同时考虑中间主应力效应和条间基质吸力方法的稳定性计算结果增大27.6%,能够更加经济、合理地评价非饱和土斜坡稳定性。

Stability Analysis of Unsaturated Soil Slope Based on Unified Strength Theory

Based on double shear unified strength theory and the shear strength formula of unsaturated soil, combining Sarma method, this paper deduced the unsaturated soil slope stability calculation formula considering intermediate principal stress and inter-slice matrix suction and it was testified by applying to the engineering projects. The research result shows that the coefficient of unsaturated soil slope stability has the positive correlation with the intermediate principle parameter b and the matrix suction and both have made contributions to the stability of unsaturated soil. When the matrix suction is 50 kPa, the stability coefficient of the calculation method considering the intermediate principal stress and inter-slice matrix suction is larger than that of the traditional method by 27.6%. So, it can evaluate the stability of unsaturated soil more economically and reasonably.