Research on the Influence of Variable Stiffness Levelling Piles on Differential Settlement of High-rise Buildings

Abstract

Due to the differential settlement of the piled raft foundation of high-rise buildings and super high-rise buildings, secondary stresses will be generated in the superstructure, and variable stiffness leveling can solve this problem. However, different methods of laying piles may cause large differences in the amount of piles used and the bearing capacity of the foundation. In order to explore the effects of different combinations on differential settlement and internal forces, this article studies the upper structure and foundation as a whole, using finite element software ABAQUS, calculation and analysis of piled raft foundations under self-weight and lateral loads. The effects of different pile lengths, different pile diameters, dense piles, and different pile lengths and different pile diameters on the different settlements and internal forces are analyzed. The research found that the variable pile length form has the best effect on the control of differential settlement, followed by the variable pile pitch type, and the effect of the variable pile diameter, the combination of variable pile length and variable pile diameter is poor. The research results can guide the design unit’s design of pile distribution, and maximize the economy and safety.