基于上限刚性块体法分析地震与超载作用下非饱和边坡稳定性
Analysis of Unsaturated Slope Stability under Seismic and Surcharge Loading by Upper Bound Rigid Block Method
AI总结：
本文采用上限极限分析与对数螺旋破坏机制，结合吸应力方法，研究了超载与地震作用下非饱和均质边坡的稳定性，并通过参数研究与稳定性图表验证了方法的有效性。
摘要：
土质边坡失稳是一种频繁发生的现象，主要归因于过量降雨和施加超载。然而，以往大多数边坡稳定性分析未考虑土壤的非饱和状态。本文的主要目的是探讨在不同气候条件下，承受超载和拟静力地震作用的非饱和均质边坡的稳定性。采用对数螺旋破坏机制的上限极限分析技术进行研究。使用基于吸应力的有效应力方法来捕捉边坡非饱和区的影响。吸应力通过Gardner单参数水力传导函数和van-Genuchten土水特征曲线进行建模。进行了广泛的参数研究，以评估边坡几何形状、土壤强度参数、水力学参数、地下水位深度、各种流态、超载和地震载荷的综合影响。提出了若干稳定性图表，分别展示超载和地震载荷对处于不同气候条件下的非饱和均质边坡的影响。本文计算结果与文献中现有解吻合良好。
英文摘要：
Failure of earthen slopes is a very recurrent phenomenon, credited mainly due to the excess rainfall and application of surfeit surcharge. However, most of the analyses regarding slope stability were performed without considering the unsaturated state of the soil. The prime purpose of the present manuscript is to address the stability of unsaturated homogeneous slopes subjected to surcharge load and pseudo-static seismic forces under different climatic conditions. The upper bound limit analysis technique was used based on the log-spiral failure mechanism. The suction stress-based effective stress approach was used to capture the effect of the unsaturated zone of the slope. The suction stress is modelled using Gardner's one-parameter hydraulic conductivity function and van-Genuchten's soil water characteristics curve. An extensive parametric study is carried out to assess the combined effect of slope geometry, soil-strength parameters, hydro-mechanical parameters, depth of water table, various flow conditions, surcharge load, and seismic loading. A few stability charts are proposed to show the impact of surcharge load and seismic load separately on unsaturated homogeneous slopes subjected to various climatic conditions. The present computed solutions match quite well with the available solutions prescribed in the literature.
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