Abstract

The vertical bearing behaviors of the flexible batter pile groups in sand are investigated in this study. A series of model tests are carried out to study the effects of the batter angle (θ) on the vertical bearing capacities (V_g) and distributions of internal forces of the pile groups. In addition, finite-element (FE) analysis is performed to explore the vertical bearing behaviors of the pile groups with various configurations, and the vertical bearing mechanism of the batter pile groups is analyzed. Moreover, a design method is proposed for predicting the bearing ratios (β) of the batter pile groups. The results show that the batter pile groups generally can provide higher vertical bearing capacities than the vertical pile groups with the same configuration. The batter angles for providing the greatest vertical stiffness are decreased with the increase of length–diameter ratio (R) and are not affected by the variation of relative density (D_r). The predicting results obtained from the design method match well with the model test and FEM results. Some suggestions are proposed for guiding the application of the batter pile groups in practice engineering.

摘要

本研究研究了砂土中柔性面桩群的竖向承载性能。通过一系列模型试验研究了倾斜角度（θ ）对群桩竖向承载力（V _{g ）和内力分布的影响。}此外，还进行了有限元（FE）分析，探讨了不同构型群桩的竖向承载行为，并对斜群桩的竖向承载机理进行了分析。此外，还提出了一种预测轴承比（β）的面糊堆组。结果表明，横向群桩一般比相同构型的竖向群桩能够提供更高的竖向承载力。提供最大垂直刚度的面角随着长径比（R ）的增加而减小，并且不受相对密度（ Dr _）变化的影响。设计方法得到的预测结果与模型试验和有限元结果吻合良好。提出一些建议，以指导群斜桩在实际工程中的应用。