新型压扩多支盘灌注桩的数值模拟分析

Numerical Simulation Analysis of a New Pressured Multi-Branch Bored Pile

压扩多支盘灌注桩是在挤扩支盘扩孔灌注桩的基础上改进而来的一种新桩型,是将静压桩、沉管灌注桩、扩底桩和多支盘灌注桩的多种优点集于一体的新型桩基技术。压扩支盘桩具有承载力高、沉降小、经济性好的优点。利用ANSYS有限元分析软件对竖向受压时的二支盘压扩支盘桩进行数值模拟,得出了竖向荷载下侧摩阻力和桩端阻力的变化规律。桩的多个支盘构成了多支点摩擦端承桩,竖向荷载主要由承力盘承受,上支盘受力大于下支盘受力。提出了压扩支盘桩的支盘竖向临界间距、布桩最小间距的建议值。

The pressured multi-branch bored pile is a new pile type improved on the basis of squeezed branch reaming pile with a new pile technology which possesses many advantages of the jacked pile, driven cast-in-place pile, enlarged toe pile and multi-branch bored pile. The pressured multi-branch bored pile has advantages of high bearing capacity, small settlement and cost-effective. The ANSYS finite element analysis software is used to simulate the properties of pressured double-branch pile on the vertical load and obtain the change of the shaft resistance and tip resistance of pile under the vertical load. The multi-pivot friction and end-bearing pile is made up of pile branches, so the bearing branches mainly bear the vertical load and the force of the above branch is greater than that of the below one. The recommended value of branch vertical critical spacing and the pile minimum spacing of pressured branch pile is proposed in this paper.