Lateral Bearing Characteristics of Inclined Pile Foundation Under Combined Load

To study the lateral bearing characteristics of inclined pile foundations under the combined action of vertical and lateral loads, indoor model tests and numerical simulations were carried out in conjunction with the pile foundation selection project of Hengqin Bridge in Zhuhai city. On this basis, the stress and deformation characteristics of inclined pile foundations under combined loads were analyzed under different pile inclinations, different pile top spacing different vertical loads, and different layer thickness ratio conditions. The results showed that increasing the pile inclination angle, the spacing between pile tops, the vertical load on the top of the pile cap, and the layer thickness ratio were beneficial to increase the lateral bearing capacity of the inclined pile foundation. The spacing between pile tops had the greatest influence on the lateral bearing capacity of the pile foundation, followed by the pile inclination angle, the vertical load on the top of the pile cap, and the layer thickness ratio. In the inclined pile foundation, the bending moment at the top of corner pile 2# was the largest, followed by corner pile 1# and middle pile 3#. The bending moment at the top of each foundation pile decreased with the increase of pile inclination and pile top spacing, and first decreased and then increased with the increase of vertical load; The transverse load sharing on the top of each foundation pile tended to be uniform with the increase of pile inclination, pile top spacing and vertical load on the top of the bearing platform. The lateral deformation of foundation soil on the right side of inclined pile foundation increased with the increase of lateral load, and the lateral deformation of foundation soil on the left side of pile foundation was almost unchanged with the increase of lateral load, but the degree of pile-soil separation increased gradually; Increasing the inclination angle of the pile could reduce the degree of pile-soil separation; The displacement isoline of foundation soil near the bottom of pile cap was wavy, and the displacement isoline of foundation soil far from the bottom of pile cap was elliptical. The results can serve for the design and construction of similar engineering. © 2022 Editorial Department of Journal of Sichuan University. All rights reserved.