4.7 Article

Numerical analysis of the seabed liquefaction around a fixed gravity-based structure (GBS) of an offshore platform and protection

Journal

OCEAN ENGINEERING
Volume 249, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2022.110844

Keywords

Gravity-based structure (GBS) offshore platform; Fluid-structure-seabed interactions; Pore pressures; Seabed liquefaction; Seabed protection

Funding

  1. Postdoctoral Applied Re-search Project of Qingdao, China [A2021-002]
  2. National Natural Science Foundation of China [U2006225,41772318]
  3. Shandong Provincial Overseas High-Level Talent Workstation, China

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This study investigates the wave-induced instantaneous liquefaction of a poro-elastic seabed around a GBS offshore platform and proposes a protection system. Numerical results show that the protection system can significantly reduce wave forces and liquefaction depth, and wave height and current velocity have significant impact on seabed liquefaction.
The fixed gravity-based structure (GBS) platform has been widely constructed offshore in support of exploring and drilling activities for oil and gas industry. The aim of the present study is to investigate the wave-induced instantaneous liquefaction of a poro-elastic seabed around a GBS offshore platform, including the consideration of the effect from the platform deck. Our approach is using an integrated three-dimensional numerical model that developed based on the Finite Volume method (FVM) in OpenFOAM. In addition, a protection system for the GBS platform has been proposed and its effect on the prevention of the wave-induced momentary liquefaction have been demonstrated. A series of simulations are performed, including a consolidation process, the fluid-structure-seabed interactions and the wave-induced liquefaction and shear failure near the GBS. Numerical results reveal that the proposed protection system can significantly reduce the wave forces and the liquefaction depth in front of the platform. The parametric study reveals that the wave height and current velocity have significant impact on the seabed liquefaction in the vicinity of the GBS offshore platform. The protecting effect of the protection piles decreases with increasing of the column spacing and the distance from the GBS.

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