Journal of Shanghai Jiao Tong University ›› 2019, Vol. 53 ›› Issue (1): 85-92.doi: 10.16183/j.cnki.jsjtu.2019.01.012

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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

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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