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A Framework for Mooring and Anchor Design in Sand Considering Seabed Trenches Based on Floater Hydrodynamics

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  • Shengjie Rui

    (Key Laboratory of Offshore Geotechnics and Material Engineering of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
    Norwegian Geotechnical Institute, 0484 Oslo, Norway)

  • Hang Xu

    (Key Laboratory of Offshore Geotechnics and Material Engineering of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)

  • Long Teng

    (Key Laboratory of Offshore Geotechnics and Material Engineering of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)

  • Chen Xi

    (Key Laboratory of Offshore Geotechnics and Material Engineering of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)

  • Xingye Sun

    (Key Laboratory of Offshore Geotechnics and Material Engineering of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)

  • Haojie Zhang

    (Key Laboratory of Offshore Geotechnics and Material Engineering of Zhejiang Province, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China)

  • Kanmin Shen

    (PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, China)

Abstract

Seabed trenches reduce anchor capacity. However, the adverse influence is not considered in the current design, and no guideline is found in engineering practice. This paper presents a framework for mooring and anchor design in sand considering seabed trenches based on floater hydrodynamics. First, a hydrodynamic calculation of the studied floater coupled with the mooring system was conducted. Then, the potential trench profile was assessed using a mooring line–seabed dynamic model. Third, after assessing the suction anchor performance based on its installation and capacity, a refined anchor, caisson–plate gravity anchor (CPGA), was proposed, and the capacity mechanisms were analyzed. It was found that the tensions of mooring lines l 1 and l 2 resist maximum loads under a 45° load condition. Due to the sand’s high strength, a trench is difficult to form in this mooring type. The suction anchor is not suitable as an anchor for the carbonate sand, considering its installation and capacity. The analyses indicate that the increase in soil stress and soil mobilized range in front of the caisson promotes the capacity of CPGA. This paper provides a framework/example to design moorings and anchors considering potential trenches and provides a solution to the anchor design in carbonate sand.

Suggested Citation

  • Shengjie Rui & Hang Xu & Long Teng & Chen Xi & Xingye Sun & Haojie Zhang & Kanmin Shen, 2023. "A Framework for Mooring and Anchor Design in Sand Considering Seabed Trenches Based on Floater Hydrodynamics," Sustainability, MDPI, vol. 15(12), pages 1-17, June.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:12:p:9403-:d:1168913
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    1. Takvor H. Soukissian & Dimitra Denaxa & Flora Karathanasi & Aristides Prospathopoulos & Konstantinos Sarantakos & Athanasia Iona & Konstantinos Georgantas & Spyridon Mavrakos, 2017. "Marine Renewable Energy in the Mediterranean Sea: Status and Perspectives," Energies, MDPI, vol. 10(10), pages 1-56, September.
    2. Hemer, Mark A. & Manasseh, Richard & McInnes, Kathleen L. & Penesis, Irene & Pitman, Tracey, 2018. "Perspectives on a way forward for ocean renewable energy in Australia," Renewable Energy, Elsevier, vol. 127(C), pages 733-745.
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