关键词: 群桩斜桩, 有限元分析, 桩身应力, 桩身侧移

Abstract: Inclined pile, which has a relatively high horizontal bearing capacity, is widely used in cross-sea bridge, wharf, wind power station and other structures. In order to study the horizontal and vertical bearing characteristics of the inclined pile group, the finite element numerical model of 2×2 inclined pile group and 3×3 inclined pile group was established based on ABAQUS, and their horizontal and vertical bearing characteristics were studied respectively on the basis of verifying the correctness of the models by experiments. The results shows that: For the two pile group models, the larger the pile inclination angle (within 0~21°) is, the smaller the pile settlement under the same vertical load and the smaller the pile displacement under the same horizontal load. Inclined pile can effectively improve the vertical and horizontal bearing capacity of pile group. Under the same working condition, the pile displacements of the same position are similar, and the horizontal displacement of the pile decreases along the depth direction of the pile length. Due to the coupling effect of the displacement generated by the horizontal load and the displacement generated by the pile rotation, some piles have displacement in the direction opposite to the loading direction near the pile bottom. For the 2×2 pile group model and 3×3 pile group model, the increase of the number of piles does not lead to the proportional increase of the bearing capacity, and the “pile group effect” of horizontal loaded inclined pile group is similar to that of vertical loaded pile group.

Key words: pile group inclined pile, finite element analysis, pile stress, the displacement of the pile