Slope Of The Yield Stress Under Different Deformation Finite Element Analysis

Geotechnical slope stability analysis and engineering of the most important theoretical and practical issues, is one of the earliest attempts to solve the classical soil mechanics but has not yet been satisfactorily resolved issues. The last decade, a number of our new water utilities, mining, port, highway, railway and other projects and their construction is completed, the formation of a large number of slope stability problems, especially in the western mountainous areas, roads there is a lot of slope along the railway, its stability or not, on the whole project degree of reliability, safety, and have a significant impact on social and economic benefits.However, yield at home and abroad under different slope stability analysis of reports and related literature also one of the few, therefore, yield further the different conditions of slope stability analysis has important theoretical and engineering application.Slope of destruction often associated with large displacement and plastic strain, therefore, the traditional small-deformation finite element method is no doubt big error. In the plane strain condition, based on elastic-plastic large deformation theory, force control method to control the convergence of qualitative analysis of the cell type, mesh, dilation angle and elastic modulus of the slope of the impact of stress and deformation rules, while comparing large and small plastic strain difference of slope deformation. Large deformation theory to deal with geometric and material nonlinearity problems, so that not only considering the material nonlinearity of soil has to consider its geometric nonlinearity.Thus, non-linear large deformation finite element analysis is necessary slope. This paper, based on large-scale commercial finite element software ANSYS stress and deformation distribution of the slope of the numerical simulation, one hand on the slope of the asymptotic damage to deepen understanding of the mechanism, the other is to construct a given slip plane normal stress. Main completed include:calculation model; the choice of the constitutive equation; yield criterion, flow rule, hardening theorem choice; MC equivalent yield criterion and the implementation in ANSYS. On this basis, based on large-scale commercial finite element software ANSYS, according to D-Ï€plane.P yield criterion and the MC yield criterion 4 different fitting relations, through the soil strength parameters of the conversion is implemented in ANSYS 4 different yield criteria. Yield in the 4 different conditions, the simulation and has been obtained a variety of soil stress distribution, strain and displacement and its distribution, the next step for the task carried out to provide the. basic information. At the same time affecting the stress and deformation of the factors (such as element type, boundary conditions, boundaries, mesh, dilatancy angle, elastic modulus) were also characterized the examination, and gets some useful conclusions.This article further on the ANSYS software to do a brief introduction, and the calculation of the selected material model are illustrated, and then simulate a given slope of its stress and deformation law. It consists in plane strain conditions, a homogeneous soil, under the dead weight, with large and small deformation finite element in the associated and non-associated flow rule, we analyze the slope of the stress, strain and deformation. Comparison of four different combinations of the same time, the stress and strain distribution, the size of the plastic zone. Finally qualitative analysis of the cell type, mesh, dilation angle and elastic modulus of deformation for the slope of the stress effect.And compared large and small deformation of the plastic strain under different slope. The results show that the rock slope, and hard soil, with small deformation theory of finite element analysis to better reflect the slope of the stress changes its laws, and for soft soil, application of theory of large deformation finite element analysis results can and practical engineering stress and deformation of soil is more consistent.