Abstract: For many unstable slopes, local or transient large displacement often occurs, even collapse due to excavation, rainfall or earthquake. The large lateral soil displacement may generate additional internal forces and deflection in stabilizing piles. Based on the two-stage method, the Winkler’s model is adopted to simulate the effect of pile-soil interaction, and the horizontal displacement control equations of a single pile are established. By considering the continuity condition and the boundary conditions, the analytical solutions of control equations are obtained and verified by monitoring data and Poulos’s elastic continuum method. Finally, with the typical engineering accident, the influence of lateral soil movements on adjacent stabilizing piles in slope is investigated by parametric analysis. It shows that the pile deflection and bending moment are obviously affected by soil lateral movement model, such as maximum displacements, distribution shapes and center of gravity, displacements energy, etc, on which it should be pay more attention practically.

Key words: Winkler foundation beam, pile-soil interaction, lateral soil movement mode, stabilizing pile；two-stage method