桩侧后注浆抗拔桩技术的研究与应用

王卫东; 吴江斌; 王向军; 黄茂松

桩侧后注浆抗拔桩技术的研究与应用 English Version

1.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 ； 2. 同济大学地下建筑与工程系,上海 200092

详细信息

作者简介:
王卫东 (1969 – ) ,男,辽宁人,工学博士,教授级高级工程师,一级注册结构工程师, 从事高层建筑地基基础、地下工程、深基坑工程的设计与研究。

中图分类号: TU473
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出版历程
- 收稿日期: 2011-08-01
- 发布日期: 2011-12-06

Study and application of side-grouting uplift piles

1. Department of Underground Structure & Geotechnical Engineering, East China Architecture Design & Research Institute Co., Ltd., Shanghai 200002, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

摘要: 桩侧后注浆抗拔桩是指灌注桩成桩后通过桩侧预埋注浆装置注浆,改变桩身与桩周土的接触界面特性,从而提高抗拔承载力。介绍了桩侧后注浆抗拔桩的侧注浆装置、施工工艺参数和桩型特点。基于现场足尺试验、离心模型试验、剪切面试验等对桩侧后注浆抗拔桩、扩底抗拔桩和等截面抗拔桩进行对比,初步认识了桩侧后注浆抗拔桩的承载能力、承载变形特性及桩土接触界面的力学特性和注浆增强机理。结合工程实践提出了估算桩侧后注浆抗拔桩承载力的增强系数法和荷载传递法。介绍了桩侧后注浆抗拔桩技术在上海世博 500 kV 地下变电站和上海白玉兰广场工程的应用。
- 桩侧后注浆抗拔桩 /
- 现场足尺试验 /
- 离心模型试验 /
- 剪切面试验 /
- 荷载传递法
Abstract: Compared to the usual bored uplift piles, the side-grouting bored uplift piles are more effective in providing the uplift resistance by changing the interface property between the pile and the soil. The main features of the side-grouting system, construction technology and pile parameters are presented. Based on the full-scale tests, centrifugal model tests and shear tests, comparisons among the side-grouting uplift piles, base-enlarged uplift pile and straight shaft uplift pile are carried out. Some initial acknowledgement is attained, such as the bearing capacity, characteristics of load-displacement relation, interface mechanics between the pile and the soil and the strengthening mechanism of grouting. According to the engineering practice, two methods to calculate the bearing capacity of the side-grouting uplift piles are introduced, that is, grouting-strengthening empirical method and load-transfer method. The application cases of the side-grouting uplift piles in Shanghai EXPO 500 kv underground transformer substation and the project of Baiyulan Square are introduced.
- side-grouting uplift pile /
- full-scale test /
- centrifuge model test /
- shear test /
- load transfer method

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参考文献(12)

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