Numerical analysis of vertical bearing behavior of group pile foundation considering pit excavation effect

The Mohr-Coulomb's model and contact surface model are adopted to simulate the characters of soil and the interaction between pile and soil respectively; a 3D finite element model based on the interaction of piled raft foundation, soil and excavation is established by ABAQUS. It is carried out an analysis for the vertical bearing behavior of group pile foundation considering the effects of pit excavation. The changes of pile top resistance distribution, axial force of piles, lateral friction of piles, pile flexibility and moment due to excavation are discussed. The paper also compared the vertical bearing behaviors of group pile foundation considering and without considering excavation. Through this study, the basic knowledge of the effects of pit excavation on piled raft foundation for high-rise buildings are initially obtained, which would be of some referential significance for the improvement of theories for piled raft foundation design.