The Numerical Study Of Inhomogeneous Slope Stability Based On Finite Element Strength Reduction Method

The slope stability analysis is one of the most basic problems in the design of slope engineering and slope. Compared with the traditional limit analysis method and the limit equilibrium method, the finite element strength reduction method has the advantage that the critical slip surface and the corresponding safety factor can be obtained without the assumption that the shape and position of the sliding surface. The finite element strength reduction method has the advantages of numerical analysis method and limit equilibrium method. It has initial success in the calculation of slope safety factor, but the application is not wide enough, especially is less used in inhomogeneous slope which is the most common in Engineering. Based on this, this paper is aimed at the stability of the inhomogeneous slope, and discusses the concrete application based on finite element strength reduction method, the main contents and conclusions are as follows:(1) Summarized several definitions of safety factor of the strength reduction, to explore the relationship of the safety factor between the various definitions and limit equilibrium method in theoretically.(2) By using ANSYS to establish the calculation model of homogeneous slope, the elastic-plastic stability analysis is carried out by using different yield criteria, and the results are compared with the results obtained by the limit equilibrium method, to discuss the rationality and applicability of each yield criterion, the result is that the yield criterion which is more suitable to be used in the analysis of slope stability is D-P5.(3) Based on ANSYS establish the calculation model of the inhomogeneous slope, corresponding to three different criteria to calculate the corresponding the safety factor of slope, comparing the rationality of numerical results, analysis the applicability of each criterion, and puts forward corresponding suggestions. The selection of displacement monitoring points and monitoring methods are analyzed and discussed in detail to the numerical results, and obtained that using top of the hill as a monitoring point is more reasonable.(4) In view of the inhomogeneous slope model to analyze changes cohesion c and friction angle ? factor of safety F respectively at different slope angle, results showed that the factor of safety and cohesion and friction angle are positive relationship. Different from the homogeneous slope, there is no equivalent influence angle of the inhomogeneous slope, that is, there is no cohesion and internal friction angle on the stability of the impact of the same degree of slope angle.