Investigation of nonlinear wave-induced seabed response around mono-pile foundation

Zaibin Lin*, Dubravka Pokrajac, Yakun Guo, Dong sheng Jeng, Tian Tang, Nick Rey, Jinhai Zheng, Jisheng Zhang

*Corresponding author for this work

Research output: Contribution to journalArticle

47 Citations (Scopus)
9 Downloads (Pure)

Abstract

Stability and safety of offshore wind turbines with mono-pile foundations, affected by nonlinear wave effect and dynamic seabed response, are the primary concerns in offshore foundation design. In order to address these problems, the effects of wave nonlinearity on dynamic seabed response in the vicinity of mono-pile foundation is investigated using an integrated model, developed using OpenFOAM, which incorporates both wave model (waves2Foam) and Biot's poro-elastic model. The present model was validated against several laboratory experiments and promising agreements were obtained. Special attention was paid to the systematic analysis of pore water pressure as well as the momentary liquefaction in the proximity of mono-pile induced by nonlinear wave effects. Various embedded depths of mono-pile relevant for practical engineering design were studied in order to attain the insights into nonlinear wave effect around and underneath the mono-pile foundation. By comparing time-series of water surface elevation, inline force, and wave-induced pore water pressure at the front, lateral, and lee side of mono-pile, the distinct nonlinear wave effect on pore water pressure was shown. Simulated results confirmed that the presence of mono-pile foundation in a porous seabed had evident blocking effect on the vertical and horizontal development of pore water pressure. Increasing embedded depth enhances the blockage of vertical pore pressure development and hence results in somewhat reduced momentary liquefaction depth of the soil around the mono-pile foundation.

Original languageEnglish
Pages (from-to)197-211
Number of pages15
JournalCoastal Engineering
Volume121
Early online date14 Jan 2017
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • Blockage effect
  • Dynamic seabed response
  • Momentary liquefaction
  • Mono-pile foundation
  • Wave-structure-seabed interaction (WSSI)

ASJC Scopus subject areas

  • Environmental Engineering
  • Ocean Engineering

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