基于FLAC3D的单桩承载特性的数值模拟

Simulation of vertical bearing features for single pile based on FLAC3D

为了研究单桩在竖向荷载作用下的承载特性,运用FLAC3D软件进行模拟,得到了单桩在竖向荷载作用下的桩侧摩阻力、桩体轴力的分布规律,并与实测结果对比分析,得到了如下的结论:1):桩侧摩阻力随着桩顶荷载的增大而减小,由于桩侧摩阻力的存在,地表周围的土体的沉降大于桩侧土体的沉降;2):桩身轴力随着桩深表现出先增大后减小,在轴力最大处就是中性点的位置。随着桩顶荷载的增加,中性点的位置逐渐上移。

In order to study the single pile under vertical load bearing characteristics,FLAC3 D is used to simulate to get pile side friction of the single pile under vertical load and pile axial force distribution. Comparison with the measured results shows：（ 1） The pile side friction decreases with the increase of pile top load,because the existence of pile side friction makes surface of the settlement of surrounding soils greater than the pile lateral soil settlement;（ 2） The axial force of pile first increases then decreases with the depth of pile,at the biggest axial force being the position of neutral point. With the increase of pile top load,the position of neutral point moves up gradually.