Centrifuge model test and in-site observation on behaviors of side-grouting uplift pile

QIAN Jian-gu; MA Xiao; LI Wei-wei; HUANG Mao-song; WANG Wei-dong

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Centrifuge model test and in-site observation on behaviors of side-grouting uplift pile

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- Centrifuge model test and in-site observation on behaviors of side-grouting uplift pile
- Vol. 35, Issue 5, (2014)
- 作者机构：
  
  1. 同济大学地下建筑与工程系,上海,200092
  2. 同济大学岩土及地下工程教育部重点实验室,上海,200092
  3. 华东建筑设计研究院有限公司地基基础与地下工程设计研究所,上海,200002
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU473
- Online First：09 June 2014，
  
  Published：2014
- 稿件说明：
移动端阅览
QIAN Jian-gu, MA Xiao, LI Wei-wei, et al. Centrifuge model test and in-site observation on behaviors of side-grouting uplift pile[J]. 2014, 35(5).
DOI：

QIAN Jian-gu, MA Xiao, LI Wei-wei, et al. Centrifuge model test and in-site observation on behaviors of side-grouting uplift pile[J]. 2014, 35(5). DOI：

摘要

通过离心机模型试验研究了注浆对接触面特性、抗拔桩荷载-位移曲线及桩侧摩阻力的影响，揭示了注浆提高桩身侧摩阻力发展规律和抗拔承载机制，并进一步将离心机模型试验的结果与原位试验结果进行了对比分析。研究表明，注浆桩侧摩阻力的发挥呈现一个渐进过程，桩身上部极限摩阻力率先发挥，并逐渐向中下部发展；注浆后桩侧极限桩侧摩阻力得到提高，而发挥极限状态所需的桩-土相对位移减小，上拔加载过程中，桩侧上部和下部极限摩阻力增幅较大，中部增幅较小。离心与现场试验一致表明，桩侧注浆显著提高了桩的抗拔刚度及极限承载能力。

Abstract

A serious of centrifuge model tests of side-grouting uplift piles is performed to gain an insight into the mechanism of side-grouting and its effect. Mechanical properties of the contact surface

load-displacement curves and the development of skin friction resistance are discussed and compared with the in-situ test results. A further research shows that the development of side friction on uplift piles is a progressive procedure

with a leading increase of skin friction resistance at the upper part of the pile and followed by an increase of skin friction resistance at the lower part. Side-grouting leads to an increase in the ultimate skin friction resistance and a decrease in the relative pile-soil displacement at the ultimate state. Compared with the non-grouting pile

the side-grouting pile has a higher growing skin friction in the upper and lower part than that in the middle part. Both the centrifuge model and in-situ tests illustrate that the pile with side-grouting has significantly larger uplift stiffness and capacity than that without side-grouting.

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