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Nonlinear interaction between wave, breakwater and its loose seabed foundation: A small-scale case

机译：波浪，防波堤及其松散海底基础之间的非线性相互作用：小规模案例

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摘要

In offshore environment, newly deposited quaternary loose sediments widely exist in the world. Sometimes, coastal engineers cannot avoid choosing these natural loose sediments as the foundation of marine structures. Under this situation, the interaction between ocean wave, marine structures and their loose sand foundation, and the wave-induced pore pressure built-up in loose seabed foundation are the key factors in which coastal engineers would most concern. In this study, the nonlinear interaction mechanism between ocean wave, a composite breakwater and its loose elasto-plastic sand bed foundation is investigated by utilizing a semi-coupled numerical model FSSI-CAS 2D. In the coupled numerical model FSSI-CAS 2D, VARANS equation for wave model, and dynamic Biot's equation for soil model are used for the governing equations. The advanced and excellent elasto-plastic constitutive model PZIII proposed by Pastor et al. (1990) is adopted to describe the nonlinear dynamic behavior of loose sand soil under cyclic wave loading. Taking the parameters of Neveda sand determined in the VELACS project funded by NSF as the property parameters for the loose sand bed, a small-scale computational case like the experimental set-up in Mostafa et al. (1999) is taken as a representative case to investigate the wave-structure-loose seabed foundation interaction mechanism. The numerical results indicate that the pore pressure in loose seabed foundation builts up significantly, and the marine structure subsides and tilts under wave loading. The loose sand bed becomes denser and denser due to soil compaction. Parametric studies show that both the wave characteristics and the soil properties can affect the built-up of residual pore pressure in loose seabed foundation.
机译：在近海环境中，新沉积的第四纪疏松沉积物在世界范围内广泛存在。有时，沿海工程师无法避免选择这些天然的松散沉积物作为海洋结构的基础。在这种情况下，海浪，海洋结构及其疏松的砂基础之间的相互作用以及海浪在松散的海床基础中累积的孔隙压力是沿海工程师最关注的关键因素。在这项研究中，利用半耦合数值模型FSSI-CAS 2D研究了海浪，复合防波堤及其松散的弹塑性砂床基础之间的非线性相互作用机理。在耦合数值模型FSSI-CAS 2D中，控制方程使用波动模型的VARANS方程和土壤模型的动态Biot方程。 Pastor等人提出的先进而优良的弹塑性本构模型PZIII。 （１９９０）用循环波描述了松散砂土的非线性动力特性。将由NSF资助的VELACS项目中确定的Neveda砂的参数作为松散砂床的特性参数，这是一个小规模的计算案例，例如Mostafa等人的实验装置。以1999年为代表，研究了波浪结构-松散海底地基相互作用机制。数值结果表明，松散海底地基中的孔隙压力显着增加，海浪结构在波浪荷载作用下沉降并倾斜。由于土壤压实，疏松的沙床变得越来越密。参数研究表明，波浪特征和土壤特性均可影响松散海底基础中残余孔隙压力的建立。

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  • 来源
    《Ocean Engineering》 |2014年第15期|300-315|共16页
  • 作者

    Jianhong Ye; Yan Zhang; Ren Wang; Changqi Zhu;

  • 作者单位

    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;

    School of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing 10083, China,School of Civil Engineering and Building, Hubei University of Technology, China;

    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;

    State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Residual pore pressure; Elasto-plastic seabed; Quaternary loose sediments; PZIII model; VARANS equation; FSSI-CAS 2D;

    机译：残余孔隙压力;弹塑性海底;第四纪松散沉积物;PZIII模型;VARANS方程;FSSI-CAS 2D;

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