Optimal skirt spacing for subsea mudmats under loading in six degrees of freedom
Optimal skirt spacing for subsea mudmats under loading in six degrees of freedom
Two- and three-dimensional finite element analyses are performed to identify the optimal internal skirt spacing for the maximum undrained capacity of subsea skirted mudmats. Fully three-dimensional loading (vertical, biaxial horizontal, biaxial moment and torsion) is considered for subsea mudmats with skirt embedment ranging from 5% to 20% of the foundation breadth in soil with a range of linearly increasing strength with depth. The results have identified the governing case for determining the optimal skirt spacing for mudmats subjected to fully three-dimensional loading. It is also shown that optimal skirt spacing for rectangular or square mudmats can be determined in plane strain conditions using the equivalent foundation embedment ratio. The number of internal skirts required to ensure soil plug rigidity under fully three-dimensional loading is presented as a function of skirt embedment ratio, soil heterogeneity index and vertical load mobilisation. Results also indicate that effects of skirt roughness become negligible as foundation embedment ratio increases in terms of determining the optimal skirt spacing.
Bearing capacity, Failure, Numerical modelling, Offshore engineering, Seabed foundations, Torsion
10-20
Feng, X.
b1a28be8-c603-4239-9c93-b2c14274e9c7
Gourvenec, S.
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Randolph, M. F.
75caa33a-e630-4ae8-84cd-758797bf9633
October 2014
Feng, X.
b1a28be8-c603-4239-9c93-b2c14274e9c7
Gourvenec, S.
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Randolph, M. F.
75caa33a-e630-4ae8-84cd-758797bf9633
Feng, X., Gourvenec, S. and Randolph, M. F.
(2014)
Optimal skirt spacing for subsea mudmats under loading in six degrees of freedom.
Applied Ocean Research, 48, .
(doi:10.1016/j.apor.2014.07.006).
Abstract
Two- and three-dimensional finite element analyses are performed to identify the optimal internal skirt spacing for the maximum undrained capacity of subsea skirted mudmats. Fully three-dimensional loading (vertical, biaxial horizontal, biaxial moment and torsion) is considered for subsea mudmats with skirt embedment ranging from 5% to 20% of the foundation breadth in soil with a range of linearly increasing strength with depth. The results have identified the governing case for determining the optimal skirt spacing for mudmats subjected to fully three-dimensional loading. It is also shown that optimal skirt spacing for rectangular or square mudmats can be determined in plane strain conditions using the equivalent foundation embedment ratio. The number of internal skirts required to ensure soil plug rigidity under fully three-dimensional loading is presented as a function of skirt embedment ratio, soil heterogeneity index and vertical load mobilisation. Results also indicate that effects of skirt roughness become negligible as foundation embedment ratio increases in terms of determining the optimal skirt spacing.
Text
2014 Applied Ocean Research 48_10-20 Feng et al
- Accepted Manuscript
More information
Accepted/In Press date: 14 July 2014
e-pub ahead of print date: 8 August 2014
Published date: October 2014
Keywords:
Bearing capacity, Failure, Numerical modelling, Offshore engineering, Seabed foundations, Torsion
Identifiers
Local EPrints ID: 414517
URI: http://eprints.soton.ac.uk/id/eprint/414517
ISSN: 0141-1187
PURE UUID: 4ee52475-9acd-45db-98cf-14ccbbaef9d3
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Date deposited: 03 Oct 2017 16:31
Last modified: 16 Mar 2024 04:31
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Author:
X. Feng
Author:
M. F. Randolph
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