打桩过程中考虑溜桩影响的土阻力研究

李飒; 吴兴州; 王耀存; 张培献; 李怀亮; 孙振平

doi:10.11779/CJGE201506022

打桩过程中考虑溜桩影响的土阻力研究 English Version

1. 天津大学建工学院岩土所, 天津 300072；
2. 中冶建工集团有限公司勘察设计研究院, 重庆 400084； 3. 中水北方勘测设计研究有限责任公司,天津 300222；
4. 海洋石油工程股份有限公司, 天津 300452

基金项目: 国家重点基础研究发展计划（973 计划）项目（2014CB046800）；国家科技重大专项项目（2011ZX05056-002-01）；上海交大国家重点实验室开放课题（1201）

详细信息

作者简介:
李飒(1970– ), 女, 天津人, 博士, 教授, 主要从事海洋土的工程性质、土与结构物相互作用以及海洋工程等方面的研究与教学工作。E-mail: lisa@tju.edu.cn

中图分类号: TU470
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出版历程
- 收稿日期: 2014-07-15
- 发布日期: 2015-06-18

Soil resistance to driving considering effect of pile running on pile installation

1. Geotechnical Institute, Civil Engineering Department, Tianjin University, Tianjin 30072, China;
2. China Metallurgical Construction Engineering Group Co., Ltd., Survey and Design Institute, Chongqing 400084, China;
3. China Water Resources Beifang Investigation, Design and Research Co., Ltd., Tianjin 300222, China;
4. Offshore Oil Engineering Co., Ltd., Tianjin 300452, China

摘要

摘要: 大直径超长桩的可打入性分析的准确性是打桩施工顺利进行的重要保障, 打桩过程中土阻力预测是其中的关键一环。现有的预测方法都不考虑不同的打桩过程对打桩土阻力产生的影响, 根据东海某发生溜桩的实际工程, 对打桩中产生溜桩时的土阻力预测方法进行了研究。根据现场打桩全程高应变监测取得数据, 采用CAPWAP分析了整个打桩过程中土阻力随桩基入泥深度的变化, 试验数据显示, 打桩过程中的溜桩对桩侧摩阻力的分布产生了明显的影响；根据其影响程度的不同可以划分为完全影响区, 部分影响区和不影响区3 个部分, 同时给出了不同区域中土阻力的计算方法。实例验证显示, 这种方法预测的土阻力的精度明显高于现有常用方法的预测精度。
- 土阻力 /
- 溜桩 /
- CAPWAP /
- 高应变动测
Abstract: The accuracy of the drivability analysis for large-diameter piles is very important for safe pile driving, and the prediction of soil resistance to driving (SRD) is the key in this analysis. The methods often used today do not consider the influence of installation process on SRD. In order to consider the influence of pile running on SRD, high-strain dynamic tests are used to monitor the whole pile-driving procedure where pile running happens in driving. The measured data are analyzed by CAPWAP, and the change of SRD during the pile driving is studied. It can be found that the friction changes obviously before and after pile running. The influence of pile running on SRD is different at different penetration depths. According to the influence of pile running, the totally affected zone, partly affected zone and unaffected zone are divided in the soil. Moreover, the method used to predict SRD is also different in different zones. The proposed method gives a better prediction of SRD than that calculated by the methods often used today.
- soil resistance to driving /
- pile running /
- CAPWAP /
- dynamic load test

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参考文献(24)

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