Three-dimensional Limit Bearing Capacity Analysis of Unsaturated Soil Slope Under Seismic Loads
The aim of this study is to analyze the stability of unsaturated soil slope under seismic loads.To consider the impact of time effect,slope amplification effect and soil-damping property,the modified pseudo dynamic approach is adopted to describe the dynamic response of slopes.The shear strength parameters of unsaturated soil are defined by the generalized cohesion of unsaturated soil with considering the influence of matric suction and friction angle of saturated soil.Based on the three-dimensional discretized failure mechanism,a three-dimensional limit bearing capacity analysis model of unsaturated soil slope under seismic loads is conducted using the upper-bound limit analysis method.The effective of the proposed model is validated by results from published work.Finally,design charts of three-dimensional limit bearing capacities of unsaturated soil slope are provided.The results show that:① compared with two-dimensional model,the proposed three-dimensional model can provide more accurate assessment of slope stability;② neglecting the influence of shear strength parameters of unsaturated soil often leads to conservative estimations of slope stability.
万方数据
维普
