Load capacity of caisson anchors exposed to seabed trenching

Feng, Xueyang; Gourvenec, Susan; White, David

doi:10.1016/j.oceaneng.2018.09.027

Cited by 30 publications

(5 citation statements)

References 26 publications

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“…The seabed trenches have inverse impacts on the anchor capacity, for example, reducing the anchor capacities (Alderlieste et al, 2016; Arslan et al, 2015; Feng et al, 2019; Gao et al, 2022; Hernandez‐Martinez et al, 2015; Rui, Guo, Wang, Zhou, et al, 2022). Hernandez‐Martinez et al (2015) investigated the anchor capacity with the existence of a trench near a suction anchor, and found anchor capacity exhibits a reduction depending on the loading angles.…”

Section: Deep‐sea Anchorsmentioning

confidence: 99%

“…Arslan et al (2015) found that the trench impact on the passive suction at the anchor bottom is limited without the seepage path around the anchor. Based on FE simulation, Feng et al (2019) found that the trench width has a great impact on the anchor capacity. Rui, Guo, Wang, Wang, et al (2022) conducted a series of centrifuge model tests to investigate the trench impact on the anchor capacity in carbonate sand (Rui, Guo, Si, et al, 2021), and found that due to the impact of the trenches, the anchor failure mechanism changes from the translational movement to the forward rotation, and the anchor capacity decreases accordingly.…”

Section: Deep‐sea Anchorsmentioning

confidence: 99%

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Seabed structures and foundations related to deep‐sea resource development: A review based on design and research

Rui

Zhang

et al. 2023

Deep Underground Science and Engineering

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The deep‐sea ground contains a huge amount of energy and mineral resources, for example, oil, gas, and minerals. Various infrastructures such as floating structures, seabed structures, and foundations have been developed to exploit these resources. The seabed structures and foundations can be mainly classified into three types: subsea production structures, offshore pipelines, and anchors. This study reviewed the development, installation, and operation of these infrastructures, including their structures, design, installation, marine environment loads, and applications. On this basis, the research gaps and further research directions were explored through this literature review. First, different floating structures were briefly analyzed and reviewed to introduce the design requirements of the seabed structures and foundations. Second, the subsea production structures, including subsea manifolds and their foundations, were reviewed and discussed. Third, the basic characteristics and design methods of deep‐sea pipelines, including subsea pipelines and risers, were analyzed and reviewed. Finally, the installation and bearing capacity of deep‐sea subsea anchors and seabed trench influence on the anchor were reviewed. Through the review, it was found that marine environment conditions are the key inputs for any offshore structure design. The fabrication, installation, and operation of infrastructures should carefully consider the marine loads and geological conditions. Different structures have their own mechanical problems. The fatigue and stability of pipelines mainly depend on the soil‐structure interaction. Anchor selection should consider soil types and possible trench formation. These focuses and research gaps can provide a helpful guide on further research, installation, and operation of deep‐sea structures and foundations.

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Section: Deep‐sea Anchorsmentioning

confidence: 99%

Section: Deep‐sea Anchorsmentioning

confidence: 99%

Seabed structures and foundations related to deep‐sea resource development: A review based on design and research

Rui

Zhang

et al. 2023

Deep Underground Science and Engineering

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“…The above reports presented that the seabed trenches existing near the chain touchdown area in front of the anchors led to a reduction in anchor capacity. Considering the trench influences, some finite element (FE) simulations were carried out [23][24][25][26][27][28]. Hernandez-Martinez [23] used an FE model to study the holding capacity considering a trench close to a suction anchor and found that the calculated capacity was reduced by 20-45% depending on the inclined loading angle.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Alderlieste [25] recommended a downward movement of the padeye to account for possible trench formation, but it may lead to a larger trench after a long-term period. Feng [26] investigated the effect of the trench width on the anchor capacity and verified that the anchor capacity has an apparent reduction when the trench width reaches the anchor diameter. The above analyses were mainly based on finite element calculations and were not verified with model tests/field data.…”

Section: Literature Reviewmentioning

confidence: 99%

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

Rui

Long

et al. 2023

Sustainability

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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 l1 and l2 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.

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“…Trenching effects, in addition to affecting riser pipelines [94,98], also affect mooring lines [91] and the holding capacity of suction anchors used in conjunction with taut mooring lines [99]. Soil remoulding effects and water entrainment due to repeated pipeline penetration affects the shear strength of soils and has an influence on soil stiffness [100,101] the breakout resistance of the soil, which then affects pipeline dynamics [102].…”

Section: Seabed Interaction Modelsmentioning

confidence: 99%

Evaluation and mitigation of modelling errors in numerical simulations of mooring line and seabed contact

Low¹

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This project received funding from Economic Development Board of Singapore and was carried out with the support of Energy Research Institute @NTU, Lloyd's Register Singapore and Lloyd's Register Applied Technology Group; the resources and assistance provided by these organizations are duly acknowledged. I would like to thank my industrial supervisor, Mr Steve Kim, for his support and encouragement, and Dr Frank Lin for his supervision and mentorship during my overseas attachment and for developing the scope of the project. I am also very thankful to Mr David Whitehouse, with whom I have had the pleasure of running the Hypothermic Half, for helping me to get settled in at Applied Technology Group and Halifax. Mr Anand Bahuguni and Mr Krishnamoorthi Sivalingam have supported me at various stages of this journey and I am grateful for their kindness and concern for me. I would also like to especially thank Dr Kie Hian Chua for giving me plenty of valuable technical advice and suggestions, Mr Tan Hoon Kiang for his steadfast encouragement, mentorship, and belief in me, and Mr Ravi Jeeva Rathinam for his understanding, support, and advice for work and life. I am also thankful for my friends and colleagues who have walked this journey with me. I am thankful for the projects that we did together, for the detours from our work that we took together, and for the memories we have made.To my family, my parents and grandmothers, my grandfather who lives on in our memories, and my closest aunts, my deepest gratitude goes to you for your love and support. To 季烨, who gave me the courage to begin this adventure and stuck with me through it all, thank you, for everything that you have given to me.

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Load capacity of caisson anchors exposed to seabed trenching

Cited by 30 publications

References 26 publications

Seabed structures and foundations related to deep‐sea resource development: A review based on design and research

Seabed structures and foundations related to deep‐sea resource development: A review based on design and research

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

Evaluation and mitigation of modelling errors in numerical simulations of mooring line and seabed contact

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