ABSTRACT

Wave-induced liquefaction results in significant seabed dynamics and can lead to a complete loss of the bearing capacity of the soil. With the increasing use of the marine space for energy harnessing, geotechnical challenges move into the focus during the development and planning of such installations. To date, a lack of comprehensive modelling tools for wave-induced liquefaction around marine structures can be observed. This paper documents the efforts in the framework of the NuLI-MAS project to provide such a modelling tool. In particular, the paper presents the numerical implementation of the hydro-geotechnical processes together with a detailed overview of the calibration and validation strategy, employing small and large scale experimental data, respectively.

INTRODUCTION

Recently, a growing use of the marine space for renewable energy production (wind, wave, tidal, etc.) can be observed (Ocean Energy Europe, 2021). The design of the required offshore installations renders challenging due to high demands on (cost-)efficiency, durability, and sustainability. Amongst the various design challenges, the seabed response (scour and liquefaction) around marine structures is of particular importance, due to the potential severity of induced failures (Sumer and Kirca, 2021). Under extreme conditions, the seabed response can result in severe weakening of soil due to build-up of pore-water pressure (enhancing susceptibility to scour), and even in liquefaction (leading to a complete loss of bearing capacity). Thus, understanding of the wave-induced seabed response around marine structures is an essential aspect during the design of offshore installations. To that end, efficient models, capturing the hydrodynamic, structural, and geotechnical processes before, during, and after seabed liquefaction, are necessary for resilient designs of marine infrastructure.

Related studies

A large number of analytical, numerical, and experimental models concerning various aspects of seabed liquefaction can be found in the literature. Reviews of these studies are, for instance, presented in (Jeng, 2003, Sumer, 2014a, Sumer and Kirca, 2021).

This content is only available via PDF.
You can access this article if you purchase or spend a download.