Abstract: The ANSYS finite element simulation and analysis method is used to establish five groups of four-pile models with different pile spacings. The composite stresses are applied to the low-bearing platform CEP group pile foundation under different pile spacings. The displacement distributions are mapped, and the load-displacement curves are obtained. The interaction pattern between pile-soil-bearing platforms determines the most reasonable pile spacing arrangement for the group pile foundation. The results show that the larger the pile spacing, the stronger the bearing capacity of the group pile foundation, but the bearing capacity is not proportionally increased, and when the pile spacing is larger than 4 times the diameter of the disc overhang, the bearing capacity of the low-bearing platform CEP group pile foundation is not significantly increased. The most reasonable arrangement of pile spacing should be 3.5~4 times the diameter of the disk overhang, and the bearing platform and bearing disk play an important role in resisting external loads. This conclusion will make up for the shortcomings of domestic and foreign research in the field of CEP piles and provide more reliable theoretical support for the application and promotion of CEP piles in practical engineering in the future.

Key words: Low-Bearing CEP Four-Pile Foundation, Pile Spacing, Bearing Performance, Finite Element Method