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Wave/Current–Structure–Seabed Interactions around Offshore Foundations
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Wave/Current–Structure–Seabed Interactions around Offshore Foundations

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: 25 August 2024 | Viewed by 2334

Special Issue Editors

Dr. Wengang Qi

E-Mail Website
Guest Editor
Institute of Mechanics Chinese Academy of Sciences, Beijing, China
Interests: flow–structure–seabed interaction; scour around marine structures; seabed liquefaction; marine sediments; offshore foundations
Dr. Shengjie Rui

E-Mail
Guest Editor
Advanced Modelling, Norwegian Geotechnical Institute (NGI), 0480 Oslo, Norway
Interests: offshore geotechnics and ocean engineering, including the bearing capacity of anchors, mooring line–soil interaction, mooring system dynamics and sand–steel interface interaction; laboratory tests (centrifuge and element tests); numerical simulations (abaqus and comsol)
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Zhen Guo

E-Mail Website
Guest Editor
Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
Interests: wave–-seabed–-structure interaction; offshore foundation; submarine pipeline; mooring system
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the global surge in the exploration of ocean resources, there has been a significant increase in the construction of offshore infrastructure, including offshore platforms and wind turbines, over the past few decades. However, these engineering structures are prone to occasional destruction or damage due to harsh offshore environments. Therefore, ensuring the safety of marine infrastructure heavily relies on a profound understanding and comprehensive evaluation of the coupling effects between waves, currents, structures, and the seabed. The primary objective of this Special Issue is to present recent advances in the field of wave/current–structure–seabed interactions around offshore foundations. Authors are encouraged to submit articles that encompass experimental, numerical, theoretical, and applied approaches, aiming to enhance the understanding and refinement of complex physical processes involving waves/currents, foundations, and marine sediments. The scope of this Special Issue encompasses various research areas, including, but not limited to, the following:

  • Fluid–soil–structure interactions around offshore foundations;
  • Scour around offshore foundations;
  • Wave-induced seabed liquefaction;
  • Physical and numerical modelling for geohazard and offshore geotechnics;
  • Hydrodynamic loads on offshore structures;
  • Assessment and mitigation of foundations instabilities;
  • Soil characteristics and constitutive model for marine sediments;
  • Offshore foundation design.

Dr. Wengang Qi
Dr. Shengjie Rui
Prof. Dr. Zhen Guo
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Journal of Marine Science and Engineering is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • scour
  • liquefaction
  • offshore geotechnics
  • offshore foundations
  • wave–current interaction

Published Papers (4 papers)

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Research

20 pages, 7774 KiB  
Article
Stiffness Anisotropy and Micro-Mechanism of Calcareous Sand with Different Particle Breakage Ratios Subjected to Shearing Based on DEM Simulations
by Yan Gao, Ketian Sun, Quan Yuan and Tiangen Shi
J. Mar. Sci. Eng. 2024, 12(5), 702; https://doi.org/10.3390/jmse12050702 - 24 Apr 2024
Viewed by 159
Abstract
Stress-induced anisotropy in calcareous sand can cause an uneven displacement in island reef engineering. In this study, stiffness, as a quantitative indicator, is explored to reveal the stress-induced anisotropy in calcareous sand. Based on the discrete element method, the stiffness anisotropic characteristics of [...] Read more.
Stress-induced anisotropy in calcareous sand can cause an uneven displacement in island reef engineering. In this study, stiffness, as a quantitative indicator, is explored to reveal the stress-induced anisotropy in calcareous sand. Based on the discrete element method, the stiffness anisotropic characteristics of calcareous sand during shearing, as well as the impact of particle breakage, are investigated by numerical simulations. Both the macro and micro responses, i.e., the maximum shear modulus, contact normal, strong and weak contact normal force, and the direction of particle breakage, are explored for calcareous sand with different particle breakage ratios. The results show that calcareous sand exhibits notable anisotropy during shearing, with the maximum shear modulus in the vertical direction (deviatoric stress direction) being significantly greater than that in the horizontal direction. Moreover, the higher the particle breakage rate, the lower the stiffness and its anisotropy. The micro-mechanism results indicate that the primary particle breakage during the shearing process occurs in the vertical direction. That is, the particle breakage weakens the strong contact force in the vertical direction, leading to a redistribution of the strong contact forces from the vertical direction to other directions. This redistribution mainly manifests in a decrease in the anisotropy of contact normal and contact vector within the sample, as well as a decrease in the proportion of strong contact forces in the overall contacts. This, in turn, reduces the shear strength and stiffness of calcareous sand, particularly in the vertical direction, and results in a decrease in the maximum shear modulus and its anisotropy. The maximum reduction can be up to 50% of the original value. These insights can provide a certain theoretical support for the uneven displacement and long-term stability of calcareous sand for islands and reefs. Full article
(This article belongs to the Special Issue Wave/Current–Structure–Seabed Interactions around Offshore Foundations)
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17 pages, 6456 KiB  
Article
Visualized Experimental Study of Soil Temperature Distribution around Submarine Buried Offshore Pipeline Based on Transparent Soil
by Hui Li, Yajing Meng, Yilong Sun and Lin Guo
J. Mar. Sci. Eng. 2024, 12(4), 637; https://doi.org/10.3390/jmse12040637 - 09 Apr 2024
Viewed by 515
Abstract
The temperature distribution around the offshore burial pipeline is an important factor affecting its safety design and economic operation. The traditional test method cannot obtain the continuous temperature distribution of soil owing to the constraints of placing measurement sensors in soil. The transparent [...] Read more.
The temperature distribution around the offshore burial pipeline is an important factor affecting its safety design and economic operation. The traditional test method cannot obtain the continuous temperature distribution of soil owing to the constraints of placing measurement sensors in soil. The transparent soil model test is an alternative method to realize the visualization research of soil temperature. In this paper, a relationship between the temperature of transparent soil and pixel intensity was first established. Then, the transparent soil test and numerical simulation, considering the natural convection, were carried out to study the temperature distribution around the submarine pipeline during start-up and stable operation. The influence of buried depth and pipeline diameter was analyzed. The results suggest that the continuous temperature distribution can be obtained visually by using a transparent soil test, and the observed heating zone of influence extended to a radial distance of 2.6 pipe diameters. The numerical analysis results show that the influence zone of the temperature of pipeline is a distance of four pipeline diameters at a temperature difference of 45 °C. The buried depth and pipeline diameter have little influence on the influence zone. In addition, the contour curves of soil temperature around the pipeline with different diameter are similar in shape. With the decrease in the buried depth of pipeline, the temperature gradient of soil around the pipeline decreases, which is caused by the natural convection. Full article
(This article belongs to the Special Issue Wave/Current–Structure–Seabed Interactions around Offshore Foundations)
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21 pages, 6174 KiB  
Article
Wave-Induced Instantaneous Liquefaction of a Non-Cohesive Seabed around Buried Pipelines: A Liquefaction-Associated Non-Darcy Flow Model Approach
by Shichong Han, Mozhen Zhou, Dingli Zhang, Wengang Qi, Chaodong Xue and Qian Fang
J. Mar. Sci. Eng. 2024, 12(3), 373; https://doi.org/10.3390/jmse12030373 - 22 Feb 2024
Viewed by 531
Abstract
In complex marine environments, the wave-induced instantaneous liquefaction of the seabed is a key issue for the long-term safety control of marine structures. Existing computational frameworks for instantaneous liquefaction result in unreasonable tensile stresses in a non-cohesive seabed. To address this issue, a [...] Read more.
In complex marine environments, the wave-induced instantaneous liquefaction of the seabed is a key issue for the long-term safety control of marine structures. Existing computational frameworks for instantaneous liquefaction result in unreasonable tensile stresses in a non-cohesive seabed. To address this issue, a liquefaction-associated non-Darcy flow model has been proposed, but it has only been applied to the scenario of a pure seabed without a structure. In this study, we applied the previously proposed non-Darcy flow model to investigate the mechanism of wave–seabed–structure interactions under extreme wave loading considering a pipeline fully buried in a non-cohesive seabed. By comparing the liquefaction depths in the presence and absence of structures, it was found that the existence of structures weakens the attenuation of the pore pressure amplitude and influences the overall pore pressure distribution. Parametric studies were conducted. It was found that the liquefaction depth from the non-Darcy model is approximately 0.73 times that from the traditional Darcy model, regardless of whether or not a pipeline is involved. A quantitative relationship between the wave loading and structural size was established. The liquefied zone above the buried pipeline was found to be smaller than that in a pure seabed without a structure. A tentative explanation is provided for this phenomenon. Full article
(This article belongs to the Special Issue Wave/Current–Structure–Seabed Interactions around Offshore Foundations)
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22 pages, 56964 KiB  
Article
Micromechanical Analysis of Lateral Pipe–Soil Interaction Instability on Sloping Sandy Seabeds
by Yu Peng and Liming Qu
J. Mar. Sci. Eng. 2024, 12(2), 225; https://doi.org/10.3390/jmse12020225 - 26 Jan 2024
Viewed by 680
Abstract
The micromechanical mechanism of pipe instability under lateral force actions on sloping sandy seabeds is unclear. This study investigated the effects of slope angle and instability direction (upslope or downslope) on pipe–soil interaction instability for freely laid and anti-rolling pipes using coupled discrete [...] Read more.
The micromechanical mechanism of pipe instability under lateral force actions on sloping sandy seabeds is unclear. This study investigated the effects of slope angle and instability direction (upslope or downslope) on pipe–soil interaction instability for freely laid and anti-rolling pipes using coupled discrete element method and finite element method (DEM–FEM) simulations. The numerical results were analyzed at both macro- and microscales and compared with the experimental results. The findings revealed that the ultimate drag force on anti-rolling pipes increased with slope angle and was significantly larger than that on freely laid pipes for both downslope and upslope instabilities. Additionally, the rotation-induced upward traction force was proved to be the essential reason for the smaller soil deformation around freely laid pipes. Moreover, the shape differences in the motion trajectories of pipes were successfully explained by variations in the soil supporting force distributions under different slope conditions. Additionally, synchronous movement between the pipe and adjacent particles was identified as the underlying mechanism for the reduced particle collision and shear wear on pipe surfaces under a high interface coefficient. Furthermore, an investigation of particle-scale behaviors revealed conclusive mechanistic patterns of pipe–soil interaction instability under different slope conditions. This study could be useful for the design of pipelines in marine pipeline engineering. Full article
(This article belongs to the Special Issue Wave/Current–Structure–Seabed Interactions around Offshore Foundations)
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