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海上四桩导管架基础水平受荷离心模型试验

朱斌, 李涛, 毕明君

朱斌, 李涛, 毕明君. 海上四桩导管架基础水平受荷离心模型试验[J]. 岩土工程学报, 2014, 36(10): 1822-1830. DOI: 10.11779/CJGE201410009
引用本文: 朱斌, 李涛, 毕明君. 海上四桩导管架基础水平受荷离心模型试验[J]. 岩土工程学报, 2014, 36(10): 1822-1830. DOI: 10.11779/CJGE201410009
shu
ZHU Bin, LI Tao, BI Ming-jun. Centrifuge modelling on tetrapod jacket foundation subjected to lateral loads[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(10): 1822-1830. DOI: 10.11779/CJGE201410009
Citation: ZHU Bin, LI Tao, BI Ming-jun. Centrifuge modelling on tetrapod jacket foundation subjected to lateral loads[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(10): 1822-1830. DOI: 10.11779/CJGE201410009
shu

海上四桩导管架基础水平受荷离心模型试验  English Version

  • 1. 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;
    2. 浙江大学岩土工程研究所,浙江 杭州 310058;
    3. 中国能源建设集团广东省电力设计研究院,广东 广州 510663

基金项目: 国家自然科学基金项目（51179169,51127005）; 广东省电力设计研究院科技项目（2011-CGSQ-264）
详细信息
    作者简介:

    朱 斌(1977- ),男,教授,博士生导师,主要从事海洋岩土工程等方面的教学和科研。E-mail: binzhu@zju.edu.cn。

Centrifuge modelling on tetrapod jacket foundation subjected to lateral loads

  • 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. Guangdong Electric Power Design Institute, China Energy Engineering Group Co., Ltd., Guangzhou 510663, China

摘要

    摘要
  • 摘要: 导管架基础广泛应用于海上风力发电和油气开发,水平向风、浪、流、地震等作用是导管架基础发生失效破坏的主要原因。通过离心模型试验针对饱和砂土地基中四桩导管架基础,研究其在沿边长方向和沿对角线方向水平静力作用下各基桩的内力分配、桩周土反力差异和变形特性。导管架基础沿对角线加载时基桩最易被拔出,其下压基桩的桩顶剪力、桩顶负弯矩和桩身最大正弯矩均较上拔基桩大,但二者的桩身水平位移相差不大。对于本文桩间距为5.8倍桩径的导管架基础,由于群桩效应及桩身上拔力降低了桩周土有效应力,沿边长加载时上拔桩在泥面下2.5倍桩径深度范围内的桩周土反力约为下压桩的60%,而沿对角线加载时上拔桩在该深度范围内的桩周土反力仅为下压桩的40%。沿对角线加载时下压桩与上拔桩在桩顶剪力、桩顶最大负弯矩、桩顶轴力及桩身最大正弯矩等参数之间的差别也明显大于沿边长加载情况。与单桩水平加载离心模型试验结果对比发现,同一深度处单桩的桩周土反力介于导管架基础上拔桩与下压桩的桩周土反力之间。
    Abstract: Jacket foundation is widely applied in development of offshore wind power, oil and gas. The failure of a jacket foundation is mainly caused by the lateral loads of wind, wave, current, earthquake, etc. Two groups of centrifugal model tests on a jacket foundation loaded along the border and the diagonal respectively are carried out in saturated sand to investigate the distribution of internal forces, difference of soil resistance and deformation characteristics for piles. The test results show that the piles of a jacket foundation will be pulled out more easily under diagonal loading. Moreover, compared with the up-lifted pile, the downward-pushed pile bears larger shear force and the maximum negative bending moment at the top, and larger maximum positive bending moment of the pile shaft, and shows basically the same lateral deflection. As for a 5.8-diameter spaced jacket foundation, because of the pile group effect and the up-lifting force which reduces the effective stress in soil around the pile, the resistance of shallow layer soils around the up-lifted pile is 60% of that around the downward-pushed pile within the depth of 2.5-diameter below mudline under diagonal loading, which is only 40% of that under diagonal loading. These differences of shear force, the maximum negative bending moment, axial force at the top and the maximum positive bending moment of the pile shaft between the downward-pushed pile and the up-lifted pile under diagonal loading are also more obvious than those under diagonal loading. In comparison with these results of centrifugal model tests on a large-diameter single pile under lateral loads, it is found that the soil resistance for a single pile is between that for the up-lifted pile and the downward-pushed pile of a jacket foundation at the same depth.
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    • 参考文献(16)
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  • 收稿日期:  2013-12-26
  • 发布日期:  2014-10-19

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