Abstract: The estimation of the lateral soil pressure on the side of foundation excavation is the key to the deep excavation support design and has drawn a wide attention by academia and partitioners in the field. Although the Rankine and Coulomb soil pressure theories, which are characterized by the limit state and the linear distribution of soil pressure, are simple and practical, they are not consistent with the actual distribution of deep excavation mechanical properties. In this paper, considering the deformation of the soil and the deformation of the soil and the supporting structure, using the numerical methods, under the condition of different excavation depth and different top horizontal displacement in the excavation supporting structures, the distribution characteristics of lateral soil pressure, its development trend and transformation characteristics are extensively studied in this paper. The relationship between the lateral soil pressure transformation and the plastic yield is summarized. At last, the formula of the residual sliding force and the coefficient of the residual sliding force are proposed.

Key words: Lateral Earth Pressures, Residual Sliding Force, Plastic Yielding, Numerical Simulation