Numerical Analysis And Simplified Analytical Methods For The Interaction Between Pile-supported Pier And Bank Slope

A pile-supported pier in south China is taken as an engineering example. Field observation, centrifuge model test, laboratory model test and numerical analysis are carried out according to the engineering problems encountered in the pile-supported pier. The deformation of the bank slope caused by the backfill and surcharge on the top of the slope and its influence on the pile-supported pier are studied in this paper. Simplified methods to analyze the pile — slope stability and pile behaviour are presented.First of all, according to the Mohr-Coulomb yield criterion, the stresses of semi-infinite slope are derived under a vertical uniform load q on the top of the slope. It is indicated that elastic and elasto-plastic states would occur in the slope. When q is less than the critical load, q_p, the slope is in elastic state. If q equals q_p, the slope is in critical state, and the plastic deformation may occur beyond the critical angle, θ_p. With the increase of q, the plastic zone would extend, and the slope is in the elasto-plastic state. If q equals limit load, q_f, the slope is in limit equilibrium state. The slope may be divided into three zones. Some charts of θ_p, the critical load coefficient and the elasto-plastic stress angle are presented in this paper.The influence of deformation of slope on the pile-supported pier is almost unavoidable. During the repairing process of a damaged pile-supported pier, strain gauges, manometers and inclinometer tubes were installed in the structure of this pier and in the bank slope, in order to measure the axial force of battered pile 6#, the lateral thrusts transmitted from the rear platform to the frontal platform and the displacement of bank slope. The tensile forces of piles 6# were increasing, and there...