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Numerical study of mobilized friction along embedded catenary mooring chains

Numerical study of mobilized friction along embedded catenary mooring chains
Numerical study of mobilized friction along embedded catenary mooring chains
Understanding the soil resistance along an embedded anchor chain is imperative for efficient and economic design of an overall mooring system as it determines the magnitude and direction of the load at the padeye of the anchor. The tensioning process of an embedded chain for catenary moorings was modeled using a coupled Eulerian–Lagrangian (CEL) finite element approach simulating the large deformations of the chain as it cuts through the soil to form an inverse catenary. The analyses reveal that the configuration of the embedded chain and the relationship between tension and chain angle at the padeye show excellent agreement with previously published analytical predictions. However, the ratio of the tension at the padeye to that at the mudline obtained from CEL is significantly higher than the theoretical values, mainly due to partial mobilization of the frictional soil resistance along the length of the chain. The CEL results indicate that the partial mobilization is a result of the combined-loading effect during failure of the soil around the embedded chain as it cuts through the seabed, in contrast with the conventional assumption that the ultimate frictional and normal soil resistances are mobilized simultaneously. A new design approach is proposed for calculating the local equivalent coefficient of friction based on the yield locus for a deeply embedded chain and the normality rule.
1090-0241
1-13
Sun, Chao
23223a45-c4f1-419f-8530-473c3c3ab77b
Feng, Feng
04f20a64-6bed-42b5-9815-488df06a5929
Neubecker, Steve
ee2cc546-b2f8-4f64-bda5-d2867f946a55
Randolph, Mark
05c8dec9-cf94-42ef-8b4c-82bce017c82a
Bransby, M.F.
89f400b2-6f20-4b5c-b163-965df69b1f02
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Sun, Chao
23223a45-c4f1-419f-8530-473c3c3ab77b
Feng, Feng
04f20a64-6bed-42b5-9815-488df06a5929
Neubecker, Steve
ee2cc546-b2f8-4f64-bda5-d2867f946a55
Randolph, Mark
05c8dec9-cf94-42ef-8b4c-82bce017c82a
Bransby, M.F.
89f400b2-6f20-4b5c-b163-965df69b1f02
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8

Sun, Chao, Feng, Feng, Neubecker, Steve, Randolph, Mark, Bransby, M.F. and Gourvenec, Susan (2019) Numerical study of mobilized friction along embedded catenary mooring chains. Journal of Geotechnical and Geoenvironmental Engineering, 145 (10), 1-13, [04019081]. (doi:10.1061/(ASCE)GT.1943-5606.0002154).

Record type: Article

Abstract

Understanding the soil resistance along an embedded anchor chain is imperative for efficient and economic design of an overall mooring system as it determines the magnitude and direction of the load at the padeye of the anchor. The tensioning process of an embedded chain for catenary moorings was modeled using a coupled Eulerian–Lagrangian (CEL) finite element approach simulating the large deformations of the chain as it cuts through the soil to form an inverse catenary. The analyses reveal that the configuration of the embedded chain and the relationship between tension and chain angle at the padeye show excellent agreement with previously published analytical predictions. However, the ratio of the tension at the padeye to that at the mudline obtained from CEL is significantly higher than the theoretical values, mainly due to partial mobilization of the frictional soil resistance along the length of the chain. The CEL results indicate that the partial mobilization is a result of the combined-loading effect during failure of the soil around the embedded chain as it cuts through the seabed, in contrast with the conventional assumption that the ultimate frictional and normal soil resistances are mobilized simultaneously. A new design approach is proposed for calculating the local equivalent coefficient of friction based on the yield locus for a deeply embedded chain and the normality rule.

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2019 Sun et al ASCE JGGE - Accepted Manuscript
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More information

Accepted/In Press date: 2 June 2019
e-pub ahead of print date: 30 July 2019
Published date: October 2019

Identifiers

Local EPrints ID: 433396
URI: http://eprints.soton.ac.uk/id/eprint/433396
ISSN: 1090-0241
PURE UUID: d31fb284-f53e-4079-a145-4e8d614f7e04
ORCID for Susan Gourvenec: ORCID iD orcid.org/0000-0002-2628-7914

Catalogue record

Date deposited: 19 Aug 2019 16:30
Last modified: 09 Jan 2022 03:59

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Contributors

Author: Chao Sun
Author: Feng Feng
Author: Steve Neubecker
Author: Mark Randolph
Author: M.F. Bransby
Author: Susan Gourvenec ORCID iD

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