An analytical solution for the undrained horizontal–torsional resistance of mudmats
An analytical solution for the undrained horizontal–torsional resistance of mudmats
Rectangular mudmat foundations are frequently used for supporting subsea structures for offshore oil and gas developments. The self-weight of the subsea structure and mudmat often mobilise a relatively small proportion of the vertical bearing capacity and horizontal–torsional sliding generally represents the governing load case. However, the effect of torsion on mudmat capacity is not explicitly considered in current guidelines for geotechnical design of offshore foundations. In this paper, upper-bound plastic limit analysis is used to develop explicit expressions for the combined horizontal and torsional capacity of skirted mudmats. The results of the limit analyses are compared with results from finite-element analysis, and with other published solutions. A method is proposed for estimating the translational sliding resistance from the interaction diagram for biaxial horizontal loading and a unique expression is proposed to define the normalised H–T failure envelope. The effects of foundation aspect ratio, foundation embedment ratio, skirt–soil interface roughness, direction of horizontal loading and degree of soil strength heterogeneity are investigated systematically.
Bearing capacity, Clays, Failure, Footings/foundations, Offshore engineering, Torsion
325-337
Feng, X.
b8f0b915-58d5-4317-9639-08b2b113b637
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
Gourvenec, S.
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
1 April 2017
Feng, X.
b8f0b915-58d5-4317-9639-08b2b113b637
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
Gourvenec, S.
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Feng, X., Randolph, M.F. and Gourvenec, S.
(2017)
An analytical solution for the undrained horizontal–torsional resistance of mudmats.
Geotechnique, 67 (4), .
(doi:10.1680/jgeot.16.P.026).
Abstract
Rectangular mudmat foundations are frequently used for supporting subsea structures for offshore oil and gas developments. The self-weight of the subsea structure and mudmat often mobilise a relatively small proportion of the vertical bearing capacity and horizontal–torsional sliding generally represents the governing load case. However, the effect of torsion on mudmat capacity is not explicitly considered in current guidelines for geotechnical design of offshore foundations. In this paper, upper-bound plastic limit analysis is used to develop explicit expressions for the combined horizontal and torsional capacity of skirted mudmats. The results of the limit analyses are compared with results from finite-element analysis, and with other published solutions. A method is proposed for estimating the translational sliding resistance from the interaction diagram for biaxial horizontal loading and a unique expression is proposed to define the normalised H–T failure envelope. The effects of foundation aspect ratio, foundation embedment ratio, skirt–soil interface roughness, direction of horizontal loading and degree of soil strength heterogeneity are investigated systematically.
Text
2017 Geotechnique 67_4_325-337 Feng et al.
- Accepted Manuscript
More information
Accepted/In Press date: 9 September 2016
e-pub ahead of print date: 6 March 2017
Published date: 1 April 2017
Keywords:
Bearing capacity, Clays, Failure, Footings/foundations, Offshore engineering, Torsion
Identifiers
Local EPrints ID: 414830
URI: http://eprints.soton.ac.uk/id/eprint/414830
ISSN: 0016-8505
PURE UUID: c77cc06e-a2e9-4edc-bd9f-30b15e412c1a
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Date deposited: 11 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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