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循环荷载下海洋软黏土刚度弱化模型研究

周康健 谢明 袁志颖

周康健, 谢明, 袁志颖. 循环荷载下海洋软黏土刚度弱化模型研究[J]. 岩土工程技术, 2025, 39(5): 775-781. doi: 10.20265/j.cnki.issn.1007-2993.2024-0340
引用本文: 周康健, 谢明, 袁志颖. 循环荷载下海洋软黏土刚度弱化模型研究[J]. 岩土工程技术, 2025, 39(5): 775-781. doi: 10.20265/j.cnki.issn.1007-2993.2024-0340
Zhou Kangjian, Xie Ming, Yuan Zhiying. Stiffness degradation model of marine soft clay under cyclic loading[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 775-781. doi: 10.20265/j.cnki.issn.1007-2993.2024-0340
Citation: Zhou Kangjian, Xie Ming, Yuan Zhiying. Stiffness degradation model of marine soft clay under cyclic loading[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2025, 39(5): 775-781. doi: 10.20265/j.cnki.issn.1007-2993.2024-0340

循环荷载下海洋软黏土刚度弱化模型研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0340
详细信息
    作者简介:

    周康健,男,1970年生,学士,工程师,主要从事岩土工程勘察工作。E-mail:984568189@qq.com

    通讯作者:

    袁志颖,男,1997年生,硕士,助理工程师,主要从事岩土工程研究工作。E-mail:1441006648@qq.com

  • 中图分类号: TU411

Stiffness degradation model of marine soft clay under cyclic loading

  • 摘要: 利用动三轴仪器对舟山原状海洋软黏土进行了一系列不排水条件下的循环三轴试验,分析风浪流等循环荷载作用对正常固结软黏土刚度弱化特性的影响。试验结果表明,土体动模量弱化规律与循环应力比(CSR)密切相关。在未达到临界CSR前,土样双幅轴向应变$ \varepsilon\mathrm{_{DA}} $随着循环次数线性增长;当CSR大于临界CSR后,试样的刚度随循环次数的增加显著退化,致土样破坏。研究发现,不同围压对动模量循环弱化的影响规律可由CSR反映。由试验所得规律建立了土体刚度随循环次数、循环应力幅值和围压变化的经验公式,利用ABAQUS子程序USDFLD实现了海洋软黏土刚度衰减模型在数值模型中的内嵌,研究成果可以为长期循环荷载条件下海上风机基础承载性能的数值模拟研究提供参考。

     

  • 图  1  粒径累积曲线

    图  2  GDS动三轴试验系统示意图

    图  3  淤泥质海床土的典型应变特性(CSR = 0.30; p0 = 100 kPa)

    图  4  不同CSR下双幅轴向应变的发展

    图  5  试样的典型应力应变关系(CSR = 0.30;p0= 100 kPa)

    图  6  p0 = 100 kPa下不同CSR值的轴向动模量的发展

    图  7  不同p0值的归一化轴向动模量与循环次数的关系

    图  8  经验参数的确定

    图  9  p0=100 kPa下实测试验数据与预测值的比较

    图  10  p0=50和150 kPa下实测试验数据与预测值的比较

    表  1  常规物理力学特性参数

    土样
    编号
    取样
    深度/m
    天然
    密度ρ/
    (g∙cm−3)
    干密度
    ρd /
    (g∙cm−3)
    土粒
    比重
    Gs
    饱和度
    Sr /%
    孔隙比
    e0
    渗透
    系数kv /
    (cm·s−1)
    G25-1 0.8~1.0 1.69 1.12 2.71 98 1.42 9.662×10−6
    G47-8 11.8~12.0 1.61 1.02 2.69 95 1.63 8.397×10−6
    G48-1 0.8~1.0 1.71 1.15 2.70 98 1.34 7.840×10−6
    下载: 导出CSV

    表  2  不排水循环试验汇总

    试验编号 有效固结
    围压p′0/kPa
    循环偏应力
    幅值qcyc/kPa
    循环应力比
    CSR
    循环加载
    次数N
    A1 100 10 0.10 2000
    A2 100 15 0.15 2000
    A3 100 20 0.20 2000
    A4 100 25 0.25 2000
    A5 100 30 0.30 2000
    A6 100 40 0.40 744
    A7 150 30 0.20 2000
    A8 150 50 0.33 2000
    A9 50 10 0.20 2000
    注:p0为有效固结围压;qcyc为正弦波的幅值;N为循环加载次数;$ \mathrm{CSR}=\dfrac{P_0'}{q_{\mathrm{cyc}}} $。
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-07-23
  • 修回日期:  2024-10-22
  • 录用日期:  2025-01-02
  • 刊出日期:  2025-10-10

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