A Simplified Analysis Method for an Axially Loaded Single Pile Subjected to Lateral Soil Movement

Abstract:

Based on the flexural differential equation of elastic piles,a simplified analytical solution of an axially loaded single pile subjected to lateral soil movement is put forward.In this solution,the subsoil is simulated with the Winkler’s spring model and a twostage method proposed by Poulos is introduced to establish the equations.The flexural differential equation is solved by the finite difference method,which is more convenient and more adaptable for layered foundations.The method is validated by some typical examples calculated by other methods.Results show that the interactive effects between soil movement and the axial load have some influence on the behavior of piles by generating additional displacements and bending moments which may be quite different according to the properties of both piles and soil as well as boundary conditions of pile head.The boundary conditions of pile head have obvious influence on the distribution of displacement and stress of pile.An effective restrain at the head of pile can reduce the negative couple effects of axial load and lateral soil movement acting on the pile.The present method can be applied to practical engineering.

Key words:lateral soil movement; axial load; single pile; twostage method; P-Δ effect; finite difference method