NUMERICAL SIMULATION ON THE REINFORCING EFFECT OF THE TOP-EXTEBDED CFG PILE COMPOSITE FOUNDATION

The top-extended CFG pile composite foundation is a ground treatment technique based on CFG pile foundation.It can make full use of the load collecting function of top-extended piles,and the bearing capacity and the deformation compatibility of soil between piles,which takes advantage of the pile-platform-soil interaction.Taking a highway in Henan Province as the engineering background and study object.Common CFG pile and top-extended CFG-pile composite foundation were analyzed by finite element numerical method,and various factors to the effect on settlement-controlling were discussed.The vertical displacement of the soil under the pile cap were analyzed,and the changing law of stress along the pile and vertical stress of the soil under the pile cap were studied.According to the analysis of the on-site monitoring data,some useful conclusions of the numerical simulation of the top-extended CFG pile were obtained.