Abstract:In order to study the influence of physical parameters of cushion on bearing characteristics of CFG pile composite foundation, a finite element model of CFG pile composite foundation for a project is established by using MIDAS /GTS, and the settlement of foundation and the pile-soil stress ratio under different working conditions are analyzed. The results show that the foundation settlement and pile stress ratio increase with the increase of the upper load, and the cushion can reduce the foundation settlement. The larger the cushion thickness is, the smaller the foundation settlement is and the larger the pile-soil stress ratio is. The larger the cushion modulus is, the smaller the foundation settlement is and the larger the pile-soil stress ratio is. The selection of reasonable cushion parameters is helpful to adjust the proportion of pile-soil load sharing and give full play to the bearing capacity of foundation. Considering the range of economic benefit and safety performance, the cushion thickness of the project should be 400 mm, and the modulus should be 70 MPa. The reasonable design of the actual project has a guiding role.