后注浆和复压对灌注桩端阻力的影响分析

刘念武; 俞峰; 楼春晖

后注浆和复压对灌注桩端阻力的影响分析 English Version

刘念武^{1, 2},
俞峰³,
楼春晖^{1, 2}

1. 浙江大学滨海与城市岩土工程中心,浙江杭州 310058; 2. 软弱土与环境土工教育部重点实验室,浙江大学,浙江杭州 310058; 3. 浙江理工大学建筑工程学院,浙江杭州 310018

基金项目: 国家自然科学基金项目（41102179）

详细信息

作者简介:
刘念武(1987- )，男，博士研究生，主要从事桩和基坑工程的研究。E-mail: zjulnw@163.com。

中图分类号: TU473
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出版历程
- 收稿日期: 2013-06-14
- 发布日期: 2013-11-24

Influence of post-grouting and repressing on the base resistance of bored piles

LIU Nian-wu^{1, 2},
YU Feng³,
LOU Chun-hui^{1, 2}

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 3. School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, Hangzhou 310018, China

摘要

摘要: 注浆和复压等措施能够加固桩底沉渣进而增大桩的承载力,通过对不同直径灌注桩的现场静载试验分析发现：桩端注浆和复压能够同时增大桩的侧摩阻力和端阻力,随着桩径的增大,桩的极限承载力提高。注浆桩端阻随着端部位移的增大呈先增大后变化缓慢的趋势,直径分别为800,900,1000 mm的桩在极限承载力条件下时的端阻分别为5265,4995,4815 kPa,现场试验的实测端阻尺寸效应系数分别为1,0.95,0.91。复压后端阻的变化速率大于注浆后端阻的变化速率,单位极限端阻分别为5889,5488 kPa。
- 后注浆 /
- 复压 /
- 承载力 /
- 端阻 /
- 侧摩阻力
Abstract: Post-grouting and repressing on bored piles can strengthen the loose debris in pile end and improve the ultimate bearing capacity. A series of well-designed full-scale destructive load tests are conducted to find the bearing characteristics of post-grouted piles and the effect of repressing. The results show that both the shaft and base resistances of the post-grouted piles and repressed piles increase and the ultimate bearing capacity increases with the increase of the pile diameter. The base resistance of post-grouted piles increases sharply at first and changes slowly afterwards. The ultimate unit base resistances of the piles with diameters of 800 mm, 900 mm and 1000 mm are 5265 kPa, 4995 kPa and 4815 kPa, respectively. Thus the corresponding size effect coefficients are 1, 0.95 and 0.91, respectively. The increase rate of the base resistance of the piles in the second loading cycle is larger than that for the post-grouted piles, and their ultimate unit end resistances are 5889 kPa and 5488 kPa, respectively.
- post-grouting /
- repressing /
- bearing capacity /
- base resistance /
- shaft resistance

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参考文献(14)

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后注浆和复压对灌注桩端阻力的影响分析 English Version

作者简介: 刘念武(1987- )，男，博士研究生，主要从事桩和基坑工程的研究。E-mail: zjulnw@163.com。

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Influence of post-grouting and repressing on the base resistance of bored piles

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目录

作者简介:
刘念武(1987- )，男，博士研究生，主要从事桩和基坑工程的研究。E-mail: zjulnw@163.com。