Abstract:In the paper, the displacement increment of Rayleigh distribution function is selected, and the deformation mechanism of foundation pit under Terzaghi mechanism is established considering ground overload. The shear strength calculation method considering over-consolidation ratio is improved by introducing the important factor of over-consolidation ratio. Based on the idea of mobilized strength design method (MSD), considering the influence of elastic strain energy of wall, the energy conservation relationship under the condition of displacement increment caused by multi-layer excavation is established, and the deformation prediction method considering multi-factors is obtained. Then, based on the parameter analysis, the effects of overload, wall length and stiffness, excavation depth and embedding conditions on cantilever and bulge displacement are quantitatively analyzed. Finally, by comparing the results of FE analysis and MSD method based on cosine function with those of classical cases, it is shown that the displacement increment function selected in this paper can better match the deformation profile of the wall, and the accuracy of displacement prediction can be improved by considering the elastic strain energy of the wall.