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通过建立轴对称有限元模型,分析了在大面积地表荷载作用下支盘桩单桩轴向应力的变化情况,得到了承力盘对支盘桩负摩阻力的影响规律.通过分析发现:承力盘处由负摩阻力产生的桩身轴向应力变化较大,地表均布荷载对中性点的位置影响较小;支盘桩的负摩阻力分布形态和普通桩类似,中性点以上的承力盘对负摩阻力影响较大,以下的影响较小;中性点的位置随着承力盘位置的上升和盘数的增多略有上升,随盘数、盘径及盘间距的增加桩的轴向应力增大,但中性点位置基本不变,随着桩长的增大,中性点深度与桩长之比略有降低.
Through the establishment of the axisymmetric finite element model, the change of the axial stress of single-pile pile under the action of a large area surface load is analyzed, and the influence law of the bearing plate on the negative friction of the pile is obtained. The analysis shows that: The axial stress of the pile caused by the negative skin friction at the plate changes a lot, and the influence of uniform load on the position of the neutral point is small. The distribution of the negative skin friction of the branch pile is similar to that of the ordinary pile. The load bearing plate has a great influence on the negative frictional resistance, and the following effects are small. The position of the neutral point slightly increases with the increase of the bearing plate position and the increase of the plate number. With the increase of the plate number, the plate diameter and the plate spacing The axial stress of the pile increases, but the position of the neutral point is basically unchanged. As the pile length increases, the ratio of the depth of the neutral point to the length of the pile slightly decreases.