Study On Adaptive Finite Element Method For Landslide Stability Analysis

With the development of numerical method and electronic computer technology, the application domain of the finite element method is enlarged. The adaptive FEM is the new development stage of the FEM, which benefits to reduce pre-processing works and to control the generating mesh error objectively. Due to more convenience in the analysis and more objectivity of computation results, this method has brilliant prospects in practice. In this thesis, the h-version elasto-viscoplastic adaptive FEM analysis system for 2-D problems in hydraulic structure engineering is improved. The application of this adaptive FEM analysis system in landslide stability analysis is also focused.Mesh generation is the key part of the FEM analysis, especially the adaptive FEM analysis. In this thesis, a new method of automatic quadrilateral mesh generation. is proposed. The algorithm to treat discontinuities and bolts as well as anchors has been put forward for the geotechnical engineering structures, too.After the principle of 2-D FEM analysis and mesh error estimation is brought forward, the h-version adaptive FEM analysis system is established. The effectiveness and feasibility of this system is verified by two slope engineering examples.Based on the adaptive FEM stress and deformation analysis result, an automatic search method for the critical slip surface and the minimum safety coefficient is implemented by using of genetic algorithms. The landslide examples show the feasibility and availability of the proposed method...