Offshore Foundations: Liquefaction and Soil-Structure Interaction

A special issue of Journal of Marine Science and Engineering (ISSN 2077-1312). This special issue belongs to the section "Ocean Engineering".

Deadline for manuscript submissions: closed (10 January 2024) | Viewed by 2644

Special Issue Editors

Department of Civil and Infrastructure Engineering, RMIT University, Melbourne, Australia
Interests: geotechnical engineering; offshore geotechnics; seismic response of earth systems; soil-structure interaction; consequences of soil liquefaction
Department of Engineering, Durham University, Durham, UK
Interests: computational geomechanics; soil and metal plasticity; offshore geotechnics
Department of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK
Interests: geomechanics; geohazards; reliability studies

Special Issue Information

Dear Colleagues,

The interest in offshore wind energy sector, to comply with the global climate agreements, has recently been growing steadily and has provided a significant incentive to evaluate the performance of various types of foundations for offshore wind turbines (OWTs) in different water depths. Many of the new developments in emerging offshore markets such as Asia-Pacific region, and parts of the US, lie in regions where seismic and cyclone impacts present a significant threat to stability and normal functioning of the turbines. Since the majority of offshore wind turbines (OWTs) have previously been installed in areas with low seismic activity (e.g. Northern Europe), the wave or earthquake-induced liquefaction assessment have not been the primary concerns in design of these dynamically sensitive structures.

Lack of engineering practice for managing the risks of operating projects in such natural disaster-prone regions leads to increased risks for developers, turbine manufacturers, designers, and certification bodies.

This special issue aims to publish high-quality papers which share present and future perspectives in analytical, experimental, and computational modelling.

The following topics are covered, but are not limited to:

  • Scour, and liquefaction around marine structures (fixed bottom foundations and floating offshore wind turbines)
  • Fluid-structure-soil interaction effects
  • Condition monitoring of offshore wind turbines in liquefiable soils
  • The seismic design considerations, forward rupture directivity effect, submarine landslides and tsunami
  • Mechanisms of wave-induced liquefaction around offshore foundations and its consequences

Dr. Amin Barari
Dr. Rui Wang
Dr. Alexandros Petalas
Dr. Domenico Lombardi
Guest Editors

Manuscript Submission Information

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Published Papers (2 papers)

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Research

20 pages, 6661 KiB  
Article
Quasi-Static Model Test of Pile-Supported Wharf under Cyclic Lateral Loading
by Jianfeng Wang, Lei Su, Libo Xie and Xianzhang Ling
J. Mar. Sci. Eng. 2024, 12(1), 115; https://doi.org/10.3390/jmse12010115 - 07 Jan 2024
Viewed by 710
Abstract
The pile-supported wharf (PSW) is one of the most common structures in harbor engineering. To investigate the dynamic response characteristics of the PSW, a quasi-static model test of a PSW–ground system under cyclic lateral loading is conducted. The deformation and damage processes of [...] Read more.
The pile-supported wharf (PSW) is one of the most common structures in harbor engineering. To investigate the dynamic response characteristics of the PSW, a quasi-static model test of a PSW–ground system under cyclic lateral loading is conducted. The deformation and damage processes of piles and the sand stratum are observed and obtained. The hysteresis characteristics of the PSW–ground system and the response characteristics of piles are systematically explored. The strain energy of the pile group on the sloping ground is calculated and analyzed. The results show that there are two peak bending moments on the pile, and the maximum one occurs at the pile top. The pile embedded depth and the loading direction strongly affect the strain energy distribution of the pile group. Under downslope direction loading, the center piles have the largest strain energy percentage. The strain energy extends from the center piles to the outside piles with the increase in loading displacement amplitude. The test results indicate that the landside pile and center pile should be strengthened during seismic design. Full article
(This article belongs to the Special Issue Offshore Foundations: Liquefaction and Soil-Structure Interaction)
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23 pages, 19152 KiB  
Article
Influence of Soil Plug on the Seismic Response of Bucket Foundations in Liquefiable Seabed
by Xue-Qian Qu, Rui Wang, Jian-Min Zhang and Ben He
J. Mar. Sci. Eng. 2023, 11(3), 598; https://doi.org/10.3390/jmse11030598 - 11 Mar 2023
Cited by 1 | Viewed by 1237
Abstract
The suction installation process for bucket foundations for offshore wind turbines (OWTs) can cause the formation of soil plug within the bucket, which can affect the seismic performance of the OWT. Therefore, it is important to evaluate the influence of soil plug on [...] Read more.
The suction installation process for bucket foundations for offshore wind turbines (OWTs) can cause the formation of soil plug within the bucket, which can affect the seismic performance of the OWT. Therefore, it is important to evaluate the influence of soil plug on the seismic performance of OWT on bucket foundations. In this study, a comprehensive set of high-fidelity solid–fluid coupled dynamic numerical simulations are conducted to analyze the seismic response of bucket foundations with a focus on the influence of soil plug and its potential mitigation. The influence of different bucket models, seabed soil densities, seabed inclination and reinforcement types, as well as soil plug removal techniques, are investigated. The results clearly show that the existence of soil plug has a significant unfavorable influence on the seismic performance of OWT on bucket foundations, especially for wide bucket foundations in mildly inclined seabeds, and should be considered in seismic design. Reinforcement methods, such as the application of an inner compartments, outer wings and inner pile, can improve the seismic performance of OWT on bucket foundations, with the application of an inner compartment being the most effective. Soil plug removal can alleviate the negative influence of soil plug, and should be adopted when possible. Full article
(This article belongs to the Special Issue Offshore Foundations: Liquefaction and Soil-Structure Interaction)
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