Application and Finite Element Analysis on Geogrid in the CFG Pile Composite Foundation

The paper mainly studies the geogrid's application and finite element analysis on CFG pile composite foundation.The finite element model to analyze the relative displacement between the top of pile and soil,and force status of the geogrid in the situation of CFG pile composite foundation with cushion overlaying geogrid.The result shows that CFG pile composite foundation with cushion overlaying geogrid has no significant effect on the CFG pile composite foundation's deformation and subgrade settlement,and the geogrid only work as the safety reserve of CFG pile composite foundation.In addition,through monitor and analysis of the settlement and deformation test section found that CFG pile composite foundation with cushion overlaying geogrid has larger settlement,and geogrid has little effect on the settlement of foundation and compression deformation of the soil between piles and only work as the safety reserve,it is consistent with the result of finite element analysis.