Finite Element Analysis for Pile Group Foundation Settlement in Soft soil

摘要

The three-dimensional finite element model for pile group foundation settlement analysis within soft soil pile is developed using ABAQUS. The Cap plasticity model and the elastic model are used to model the soil and the pile respectively. The contact interface elements are installed between the pile and the soil interface. The undrained loading conditions and drainage loading conditions in the soft soil piled raft foundation settlement are analyzed respectively and computation results are compared. The results show that pile group foundation in soft soil settlements increase with load increasing in both the undrained conditions and drainage conditions. The bearing capacity of the pile group under the undrained conditions is larger than that under drained conditions with the same pile group. The pile group settlement under the undrained conditions is smaller than that under drained conditions. Pile group foundations are often used in high-rise buildings within soft and weak stratum. Settlement analysis of pile foundation is vital for the building safety. The elastic theory method [1～5], finite element method[5, 6], load transfer method[5,6], blending method[5, 6] (elastic theory method in conjunction with the load transfer method) are commonly used methods for the pile group settlement analysis. In this paper, the finite element method is used to analyze the pile group settlement in soft soil under both undrained loading and drained loading conditions, reflecting the impact of different loading conditions on the soft soil settlement of pile foundation.