Abstract: Slope stability analysis is widely applied in various construction projects, and its accurate analysis is of great significance in the construction planning phase. In order to achieve the comprehensive analysis of slope stability, this study combines the nonlinear finite element analysis method and the multi grid network method as well as studies the slope stability of a hydropower station construction site by constructing a three-dimensional nonlinear finite element calculation model. The results show that there are seven sliding blocks within the entire slope, and the safety factor of the shallow sliding block is generally higher than those of deeper sliding blocks, which is greater than 1.3. That is, the stability of the shallow layer is higher. The construction excavation will reduce the stability of the slope in general. When the slope is constructed and if the seismic loads and construction loads are imposed, the coefficient stability of the shallow slide block increases and therefore the stability increases, while the safety factor of the deeper slide decreases gradually and the stability is reduced.

Key words: three dimensional, nonlinear finite element method, multigrid network, slope, stability analysis