Study on a Rapid Evaluation Method for Permanent Displacement of Soil Slopes Based on Stability Charts
To quickly evaluate the stability of soil slopes under earthquake action is currently a hot topic in the civil engineering circle.Traditionally,stability charts and the Newmark model were used to quickly eval-uate the seismic stability of soil slopes.The safety factor method was used in the most studies on the stability charts to evaluate slope seismic stability.In addition,as the stability charts for permanent displacement on the basis of Newmark Model adopted a hypothesis of infinite plane,the calculations usually were larger than the actual values.Therefore,a new method for quickly calculating the critical acceleration of soil slopes was pro-posed,which overcome the limitations of stability charts and the Newmark model.Based on the Mohr-Cou-lomb strength criterion,the numerical model for generalized soil slope was constructed by the finite element limit analysis method.According to the calculation results on 864 cases,a critical acceleration chart for soil slopes was drawn.Through two-step regression analysis,a function expression between critical acceleration of soil slopes and the slope parameters was established,and the method proposed in the paper was compared with the Newmark model and numerical solutions.The results showed that in comparisons with the solutions by the Newmark model,the calculational accuracy of solutions by the proposed method was closer to that by the numerical solutions.The necessity of developing the proposed method was reflected by comparing the quasi-static method with the permanent displacement method.The established evaluation method of perma-nent displacement for soil slopes was reliable and simple,and could be used for stability evaluation in the ini-tial design stage,providing reference to subsequent seismic design of soil slopes.
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