Pile foundation settlement calculation based on Mindlin homogenized stress and its engineering application

Based on the stress field calculated by the Mindlin stress theory and the existing Mindlin homogenization stress summation method for calculating the pile group foundation settlement, the deformation behavior of the pile-group foundation as well as the homogenization effect of pile cap and the superstructure stiffness on the settlement deformation was considered, and the detailed steps of Mindlin solution homogenized additional stress layer summation method to calculate the settlement of pile group foundation was concluded. Many specific problems exist in the calculation, such as the compression layer calculation thickness, the rigidity contribution of superstructure, the pile type diversity of optimized design of pile foundation stiffness to reduce differential settlement. A simplified method for calculating the homogenization additional stress of pile is presented based on the specific shaft resistance distribution model, the ratio of length to diameter and the distance between piles. Compared with Boussinesq deep foundation calculation method and equivalent calculation method, the proposed method in this paper can provide better settlement calculation values close to the tested ones. © 2019, Editorial Office of China Civil Engineering Journal. All right reserved.