Abstract: In order to effectively apply numerical calculation method to slope stability analysis, a mesh slope slip surface search model based on stress field is established. Firstly, the stress field of slope is obtained by establishing finite element analysis model, and the element coordinates and the stress calculation results are extracted. Secondly, a rectangular coordinate system is established according to the geometric size of the slope model, and the slope is discretized into n-grids in the plane according to the grid form, so that each grid can contain one or more original finite element grids. Thirdly, the stress field of the slope is extracted by programming, and the most likely finite element to reach the yield condition is searched and labeled in each grid according to the C-M yield criterion. Then, the potential slip elements are searched in parallel and in series, that is to say, the mesh slope slip surface search model based on stress field is realized. Finally, the international classical slope case is selected, and the slope stability is analyzed and calculated based on the expression of vector and normal safety factor. The method is compared with the traditional method and proved to be feasible and superior. This method is suitable for the evaluation and analysis of slope stability under non-limit shape, and the calculation results are more reasonable.

Key words: lope stability, stress field, grid, slip surface search