Computer Simulation and Parameters Estimation for Slope Based on Finite Element Method and Difference Evolution Arithmetic

Slope stability is one of the classic geotechnical problems, however, because of the parameters uncertainty and complexity of stress-strain relation, the conventional calculation method such as slice method adopts too much hypotheses and can not express the actual mechanical behavior of slope. Aiming to these problems, this paper exploit a slope simulation program based on difference evolution algorithm and finite element method, which can simulate the displacement and stress distribution of slope and identify actual soil parameters based on monitoring data. The theory of algorithm and program procedure are introduced. A typical calculation sample is studied using the developed program, the calculated stress and strain distribution is reasonable and the identifying parameters of the elastic modulus and Poisson ration of the soil is accuracy. The convergence performances corresponding to different F and CR of DE algorithm are also compared. It states that the program is feasible and has good adaptability for complex slope calculation.

I. Introduction

Slope sliding is a general phenomena in the world, Slope deformation and stability is the important problem in the soil and rock mechanics area. As we known that sloping calculation is classic soil mechanics problem and it is generally based on limit analysis method of rigid body hypothesis. Figure 1 is the slice method for slope stability analysis. The conventional methods adopts predigestion incongruent with the actual stress distribution and sola distortion to solve geotechnical engineering problem, which cannot reflect even more complex stress-strain relationship (such as elastoplasticity, viscoelastic plasticity and so on), therefore whose flexibility is limited ^[1]–[2].