桩侧注浆抗拔桩离心模型试验与原位测试分析

›› 2014, Vol. 35 ›› Issue (5): 1241-1246.

桩侧注浆抗拔桩离心模型试验与原位测试分析

钱建固^{1, 2}，马霄^{1, 2}，李伟伟^{1, 2}，黄茂松^{1, 2}，王卫东³

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

收稿日期:2013-01-28 出版日期:2014-05-10 发布日期:2014-06-09
作者简介:钱建固，男，1972年生，博士，教授，主要从事地下工程与岩土力学方面的科研和教学工作
基金资助:
上海市科委重大项目（No. 07dz12006）。

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

QIAN Jian-gu^{1, 2}, MA Xiao^{1, 2}, LI Wei-wei^{1, 2}, HUANG Mao-song^{1, 2}, WANG Wei-dong³

1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3.Department of Underground Structure &Geotechnical Engineering, East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002,China

Received:2013-01-28 Online:2014-05-10 Published:2014-06-09

摘要/Abstract

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。

关键词: 桩侧注浆抗拔桩, 桩侧摩阻力, 大型直剪试验, 离心模型试验, 原位测试

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.

Key words: side-grouting uplift pile, skin friction resistance, large-scale direct shear test, centrifuge model tests, in-situ observation

中图分类号:

TU 473

钱建固，马霄，李伟伟，黄茂松，王卫东,. 桩侧注浆抗拔桩离心模型试验与原位测试分析[J]. , 2014, 35(5): 1241-1246.

QIAN Jian-gu , MA Xiao , LI Wei-wei , HUANG Mao-song , WANG Wei-dong,. Centrifuge model test and in-site observation on behaviors of side-grouting uplift pile[J]. , 2014, 35(5): 1241-1246.

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