后压浆旋挖钻孔灌注桩单桩竖向承载力分析

Computation Method of the Single Pile Bearing Capcity of Post-grouting Spinning Drill Pile

通过后压浆旋挖钻孔灌注桩现场测试结果,分析了后压浆旋挖钻孔灌注桩的承载力、桩身荷载传递规律、桩的极限侧阻力分布规律。桩在竖向荷载作用下,桩的极限侧阻力发挥度,随桩的入土深度而衰减。提出了侧摩阻发挥度分布表达式及后压浆旋挖钻孔灌注桩单桩承载力计算方法,计算结果与试验结果较为符合。为后压浆旋挖钻孔灌注桩的设计提供了理论依据。

Based on the in-site measurement results of the post-grouting spinning drill pile, the engineering properties, load transferring law and side-friction distribution law of pile are analyzed. The development degree of side-friction of the pile, which subjected vertically loads, decays with the buried depth of the pile. The distribution relationship of development degree of side-friction, toe-friction and computation method of the single pile bearing capacity of the post-grouting spinning drill pile are provided. Theory basis for design of post-grouting spinning drill pile are provided.