Study Of Finite Element Analysis On Slope Stabilization And Failure Criterion Under Different Model

Today there are three failure criteria in slope stability analysis: (1)the non-convergence of the numerical calculation;(2)the abruptness of the displacement or deformation at a certain characteristic location;(3)the connectivity of plastic zone on slip surface.As a key of finite element method based on shear strength reduction,the slope failure criterion will affect the accuracy of the calculation.In this paper,finite element software FLAC^3D was used to calculate three different slope examples and solve the safety factor of the slope under elastoplastic model and viscoelastoplastic model,then compare the two safety factor and the method to identify the safety factor in order to master the application effect and applicability of three failure criteria under different model.Beside this,the paper also studied the stability of viscoelastoplastic model with consideration of rheology and discussed the feasibility of using curve of displacement-creep time to identify safety factor under viscoelastoplastic model.While analyzing the stability of viscoelastoplastic model,coefficient the viscosity will maybe affect safety factor,so the paper also compared safety factor of the slope under different Kelvin coefficient the viscosity and Maxwell coefficient the viscosity.As far as we know,loading method is one of the methods commonly used in the limit equilibrium method.Based on the basic idea of loading method,the paper have done some relevant research of loading in finite element method,The study found that loading method also can be used in finite element method,and safety factor and critical acceleration K_c have certain relationship.So we can consider critical acceleration K_c as one of indicators while evaluating slope stability.