上海交通大学学报

上海交通大学学报 ›› 2019, Vol. 53 ›› Issue (1): 85-92.doi: 10.16183/j.cnki.jsjtu.2019.01.012

• 学报（中文） • 上一篇    下一篇

椭圆余弦波作用下考虑桩身振动的桩-土相互作用

张忆州a，廖晨聪a,b，陈锦剑a,b   

  1. 上海交通大学 a. 土木工程系； b. 海洋工程国家重点实验室， 上海 200240
  • 出版日期:2019-01-28 发布日期:2019-01-28
  • 通讯作者: 廖晨聪，男，助理研究员，电话(Tel.)：021-34204833；E-mail：billaday@sjtu.edu.cn.
  • 作者简介:张忆州(1993-)，男，上海市人，硕士生，主要研究方向为海洋岩土力学与工程.
  • 基金资助:
    国家自然科学基金(41372282, 51679134, 41602282)

Interaction Between Mono-Pile and Porous Seabed Under Cnoidal Wave and Pile Rocking

ZHANG Yizhou,LIAO Chencong,CHEN Jinjian   

  1. a. Department of Civil Engineering; b. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Online:2019-01-28 Published:2019-01-28

PDF (PC)

836

被引次数

1

摘要： 针对海洋中浅水区域的单桩基础，建立了包含波浪、海床和单桩的三维数值模型，考虑浅水环境中椭圆余弦波与海洋风浪引起的桩身振动的共同作用，研究了桩-土耦合系统的动态响应问题.其中，波浪模型的椭圆余弦波采用Navier-Stokes方程控制，海床模型视为各向同性的多孔介质，并采用Biot方程模拟土体与孔隙水的动态响应，单桩视为可变形弹性体，并引入周期性的水平位移来模拟桩身振动.同时，在验证模型准确性的基础上，分析了椭圆余弦波作用下桩身位移、桩周的海床孔隙水压及海床液化等变化情况，并对波浪及海床的主要特性参数进行了分析.结果表明：桩身振动会导致桩顶区域的海床孔隙水压出现局部变化，并使孔隙水压沿海床深度方向的减小趋势变缓；波浪与海床的特性参数对孔隙水压的分布影响显著.

关键词: 单桩基础, 桩身振动, 椭圆余弦波, 桩-土相互作用, 动态海床响应

Abstract: For research of offshore mono-pile foundation in shallow water, a 3-D model is established by combining wave, seabed and mono-pile to investigate dynamic response of coupled seabed and mono-pile interaction under cnoidal wave and pile rocking caused by wind and flow motion. The cnoidal wave model is governed by Navier-Stokes equations to generate cnodial wave motion. The seabed model is treated as an isotropic porous medium and the dynamic response of soil and pore water is simulated by Biot’s equations. The mono-pile is treated as deformable elastic body and pile rocking is simulated by cyclic horizontal displacement. Based on validation for simulation accuracy of present model, dynamic response of mono-pile displacement, pore water pressure and liquefaction in the vicinity of the mono-pile subject to cnoidal wave are analyzed. Furthermore, parametric studies are conducted to discuss the effect of wave and seabed characteristics. The results show that the pile rocking effect leads to local change of pore pressure at the top part of mono-pile, and slows down the rate of pore pressure decrease along seabed depth. In addition, the variations of wave and seabed parameters make obvious effects on pore pressure distribution.

Key words: mono-pile foundation, pile rocking, cnoidal wave, seabed-pile interaction, dynamic seabed response

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