超长群桩基础的有限差分数值分析

Research of Effects on Super-long Group Piles Foundation by Different Elevations of Cushion Caps

承台-桩-土的相互作用使群桩基础的受力变形特性复杂,而超长桩由于桩身很长,加深了这种相互作用的复杂性。本文通过有限差分数值软件FLAC3D对承台标高不同、桩端土层不同及桩距不同的超长群桩基础进行了分析。计算结果表明,低承台对群桩基础的受力更有利。超长群桩因为桩身弹性压缩引起的沉降不容忽视。桩距越大,群桩效应的影响越小,但基桩桩顶的差异沉降越大力。本文采用有限差分数值软件FLAC3D计算,为超长群桩的设计计算提供了一种新的途径,计算结果对工程实际具有指导意义。

Interaction of cushion caps-piles-soil make that bearing and deformation characters of group piles foundation are complex.Moreover,super-long group piles deepen the complexity of the interaction.By using the software of finite difference in this paper,cushion caps with different elevations are analyzed.The results show that when same forces act on cushion caps,axial forces of each pile and settlements of piles caps of low elevations cushion caps are less than high elevations cushion caps.So using low elevation cushion caps is more conducive to super-long group piles foundation.