Finite element analysis of pile stress in static pressure pile installation

The interaction process of pile-soil is severe in pile installation.In the pile installation process,pile stress conditions have an important influence on pile bearing capacity and durability.In this paper,finite element method is used to carry out numerical simulation of the pile installation process through the displacement control method.The whole process analysis of pile stress is realized with simulation calculation of pile-soil radial compression and vertical friction.The results show that pile bears vertical compressive stress mainly in the process of pile sinking.Especially,the vertical compressive stress becomes bigger in the end of pile installation.The single factor control method is used to analysis the influence of various factors on pile stress,and the correlation and sensitivity analyses are performed.Analyses show that the pile stress has a positive correlation with the friction coefficient,internal friction angle,cohesion and pile-point angle in the process of pile installation,and is negatively correlated with the pile diameter.Pile-point angle has weak sensitivity to pile stress.