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海洋高桩基础水平单调及循环加载现场试验

朱斌, 杨永垚, 余振刚, 郭杰锋, 陈云敏

朱斌, 杨永垚, 余振刚, 郭杰锋, 陈云敏. 海洋高桩基础水平单调及循环加载现场试验[J]. 岩土工程学报, 2012, 34(6): 1028-1037.
引用本文: 朱斌, 杨永垚, 余振刚, 郭杰锋, 陈云敏. 海洋高桩基础水平单调及循环加载现场试验[J]. 岩土工程学报, 2012, 34(6): 1028-1037.
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ZHU Bin, YANG Yong-yao, YU Zhen-gang, GUO Jie-feng, CHEN Yun-min. Field tests on lateral monotonic and cyclic loadings of offshore elevated piles[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(6): 1028-1037.
Citation: ZHU Bin, YANG Yong-yao, YU Zhen-gang, GUO Jie-feng, CHEN Yun-min. Field tests on lateral monotonic and cyclic loadings of offshore elevated piles[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(6): 1028-1037.
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海洋高桩基础水平单调及循环加载现场试验  English Version

  • 1.浙江大学软弱土与环境土工教育部重点试验室，浙江 杭州 310058; 2. 浙江大学岩土工程研究所，浙江 杭州 310058; 3. 中交第三航务工程局有限公司宁波分公司，浙江 宁波 315200

基金项目: 国家自然科学基金项目(50979097, 51179169)；中央高校基本科研业务费专项资金项目(2012FZA4019, 2010KYJD006)；浙江省重点创新团队支持计划项目(2009R50050)
详细信息
    作者简介:

    朱斌 (1977 – ),男，湖南岳阳人，副教授，主要从事近海与海洋岩土工程及环境土工等方面的教学和科研工作。

  • 中图分类号: TU43

Field tests on lateral monotonic and cyclic loadings of offshore elevated piles

  • 1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China; 3. Ningbo Branch of CCCC Third Harbor Engineering Co., Ltd., Ningbo 315200, China

摘要

    摘要
  • 摘要: 开展了海洋软黏土中 2 根大直径高桩基础的现场水平单调和循环加载试验，实测获得了桩顶荷载 – 位移关系、桩身变形和桩身弯矩及桩侧土压力和孔隙水压力，揭示了水平单调和循环荷载作用下桩土相互作用规律及桩基水平位移和桩身弯矩发展规律。利用实测桩身水平位移推算了桩周土反力，在此基础上提出了相应的双曲线型 p – y 曲线，通过引进 Poulos 循环弱化模型建立了水平循环荷载作用下的桩基双曲线型 p – y 曲线分析模型，水平单调及循环荷载作用下桩顶荷载 – 位移关系、桩身变形和桩身弯矩及桩侧土压力等计算结果与实测值均吻合良好。通过现场试验发现规范 p – y 曲线法计算结果偏保守的主要原因是所采用的 p – y 曲线的刚度偏小；不同时段的循环荷载对桩基循环累积变形有叠加效应。 建议设计中应考虑桩基全寿命服役期内所承受的所有循环荷载的影响， 对于重要工程应开展相应的现场水平加载试验，实测桩身水平位移或桩身弯矩，进而利用所推算的桩周土反力来分析桩基受力变形及承载力。
    Abstract: A series of field tests on lateral monotonic and cyclic loading are carried out for two offshore large-diameter elevated piles in soft marine clay. Force-displacement relationships of the pile heads, deformation and bending moment of the pile shaft as well as soil pressures and pore water pressures at the sides of the piles are measured. Based on the measured results, the soil-pile interaction and both of the deformation and the bending moment of the pile shaft under the lateral monotonic and cyclic loadings are studied. By calculating the soil reaction force based on the measured lateral displacement of the pile shaft, hyperbolic p – y curves for the test elevated piles are presented, and then a Poulos reduction coefficient is introduced to give the hyperbolic p – y curves under the lateral cyclic loading. Good agreement is found between the test results and the computed ones by the proposed hyperbolic p – y curves method. The main reason why the results of API p – y curves are underestimated is that the stiffness of the used p – y curves is too small. It is also found that the cyclic loadings at different stages have superposition effect on the accumulative deformation of the pile shaft, and their influence on the pile foundation should include all cyclic loads during the whole life of service. It is recommended to carry out field tests on lateral loading to measure the lateral displacement or bending moment of the pile shaft to deduce more accurate soil reaction force or p – y curves on the piles for an important project.
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    • 参考文献(19)
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  • 发布日期:  2012-06-19

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