有孔管桩单桩承载性状试验及分析

有孔管桩能够有效地加速超静孔隙水压力时空消散，减轻沉桩效应对周围环境的不利影响，但桩身开孔引起的应力集中现象会削弱桩体承载力。为探讨桩身开孔对管桩承载性状的影响，采用室内模型试验方法，在软土地基中开展无孔管桩和3种不同布孔方式的有孔管桩单桩静载荷试验，对竖向荷载下引起桩顶沉降及桩身不同位置的应变进行了监测和分析，获得了各种管桩的Q-s曲线、桩身轴力及桩侧摩阻力的分布规律。对比分析可知，星状开孔有孔管桩的桩身轴力削弱情况最小，双向对穿有孔管桩的桩侧摩阻力最大。

Test and analysis of bearing capacity behavior of pipe-pile with holes

The pipe-pile with holes can effectively accelerate the spatiotemporal dissipation of excess pore water pressure and reduce the negative effects of sinking-pile influence for the surrounding environment. However, the bearing capacity of pile will be weakened by the stress concentration phenomenon caused by opening hole. In order to explore the effect of the bearing capacity of pipe-pile due to opening holes, the static load tests of single pile have been carried out for the pipe-pile without hole and the pipe-pile with holes in soft soil foundation by using of the model tests, which are three kinds of opening holes. The settlement of the pile top and the pile strain in different positions caused by vertical load have been measured and analyzed. The Q-s settlement curves, axial force and side friction distributions of the all piles can be obtained. From the comparative analysis, it can be concluded that the decrease of axial force of pile of radial direction pipe-pile with holes is the minimum; the side friction of double direction pipe-pile with holes is the maximum.