竖向荷载下超大群桩受力变形分析

根据模型试验研究结果，分析了在竖向荷载作用下超大群桩基础的荷载传递特点、群桩的承载性关和桩侧摩阻力的发挥特性。试验结果表明。在本试验条件下，荷载在桩间的分配，最终以中心部分桩受到的荷载量大；桩身下部轴力明显小于上部轴力；随荷载的增加，桩身侧摩阻力由下部先行发挥并逐步向上发展。

The Deformation Behavior of Super-Large Pile Group under Vertical Load

Based on the model test of a super large pile group under vertical load, the characteristic of load transfer, the bearing behavior, and the law of variation in side resistance of the pile group are analyzed. It is shown that under the experimental conditions the middle piles are subjected to the maximum vertical load, and the axial force in the lower part of a pile is larger than that in the upper part. With the load increasing, the side resistance of a pile comes into play first in the lower part of the pile, and increases progressively from the lower part to the upper part.