浅析后压浆提高灌注桩承载力

Analysis on Improving the Bearing Capacity of the Boring Pile by Post-Grouting

本文应用柱形塑性扩张理论对灌注桩后压浆的最终扩张压力与扩散半径进行推导和计算,定性分析了后压浆对桩侧,桩端土产生渗透、压密、劈裂三种效应机理,应用经验公式分析了压浆前后承载力的变化及其影响因素,通过工程实例总结得出相关结论,对于同类工艺的技术参数选取有现实的指导意义。

The paper calculates the final expansion pressure and expansion radius of cast-in-place pile with post-grouting with Pillar Expansion theory.On the basis of the theory,the paper analyzes the effects,such as permeability,compaction and splitting,of post-grouting to pile shaft and soil around pile tip qualitatively,and the paper also analyzes the change of front-to-back bearing capacity and its influencing factors.Finally,the paper draws a conclusion by summarizing some practical projects.The paper is of some piratical guide significance to homogeneous technology in the selection of technical parameters.