The University of Southampton
University of Southampton Institutional Repository

Theoretical, numerical and field studies of offshore pipeline sleeper crossings

Theoretical, numerical and field studies of offshore pipeline sleeper crossings
Theoretical, numerical and field studies of offshore pipeline sleeper crossings

Offshore pipelines experience axial stresses due to internal pressure and thermal cycles during start-up and shut-down, leading to the formation of lateral buckles. Pipeline lay routes often include strategicallyspaced transverse sleepers, creating a vertical imperfection from which a controlled lateral buckle can be initiated. The as-laid pipeline embedment affects the pipe-soil interaction forces and therefore the buckle initiation response. The potential for increased embedment in the touchdown zones to either side of the sleeper exists, which can cause higher than expected lateral breakout forces. The magnitude of this embedment is difficult to quantify due to dynamic lay effects and changes in catenary forces as the pipe is laid over the sleeper. Theoretical solutions for the touchdown force at a sleeper crossing are presented for the case of an elastic seabed, and are compared to as-laid survey data in soft clay. Static and dynamic numerical analyses are also presented to illustrate the changes in pipe-soil contact force as a pipe is laid across a sleeper. This provides a rationale for asymmetry observed in as-laid embedment profiles and its influence from dynamic lay effects. General guidance is provided for pipeline designers to assist the assessment of pipe-soil interaction forces in the vicinity of sleepers.

845-850
CRC Press
Westgate, Z.J.
983a044b-1644-4a5c-895d-6b7c83501ab9
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Brunning, P.
2d3dc196-72b8-4aef-ba47-74914a1d35d0
Gourvenec, Susan
White, David
Westgate, Z.J.
983a044b-1644-4a5c-895d-6b7c83501ab9
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Brunning, P.
2d3dc196-72b8-4aef-ba47-74914a1d35d0
Gourvenec, Susan
White, David

Westgate, Z.J., Randolph, M.F., White, D.J. and Brunning, P. (2010) Theoretical, numerical and field studies of offshore pipeline sleeper crossings. Gourvenec, Susan and White, David (eds.) In Frontiers in Offshore Geotechnics II - Proceedings of the 2nd International Symposium on Frontiers in Offshore Geotechnics. CRC Press. pp. 845-850 .

Record type: Conference or Workshop Item (Paper)

Abstract

Offshore pipelines experience axial stresses due to internal pressure and thermal cycles during start-up and shut-down, leading to the formation of lateral buckles. Pipeline lay routes often include strategicallyspaced transverse sleepers, creating a vertical imperfection from which a controlled lateral buckle can be initiated. The as-laid pipeline embedment affects the pipe-soil interaction forces and therefore the buckle initiation response. The potential for increased embedment in the touchdown zones to either side of the sleeper exists, which can cause higher than expected lateral breakout forces. The magnitude of this embedment is difficult to quantify due to dynamic lay effects and changes in catenary forces as the pipe is laid over the sleeper. Theoretical solutions for the touchdown force at a sleeper crossing are presented for the case of an elastic seabed, and are compared to as-laid survey data in soft clay. Static and dynamic numerical analyses are also presented to illustrate the changes in pipe-soil contact force as a pipe is laid across a sleeper. This provides a rationale for asymmetry observed in as-laid embedment profiles and its influence from dynamic lay effects. General guidance is provided for pipeline designers to assist the assessment of pipe-soil interaction forces in the vicinity of sleepers.

Full text not available from this repository.

More information

Published date: 2010
Venue - Dates: 2nd International Symposium on Frontiers in Offshore Geotechnics, Perth, Australia, 2010-11-08 - 2010-11-10

Identifiers

Local EPrints ID: 419902
URI: http://eprints.soton.ac.uk/id/eprint/419902
PURE UUID: 906fdc54-177e-4d9e-9eda-cc75ac615d47
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

Catalogue record

Date deposited: 23 Apr 2018 16:30
Last modified: 10 Sep 2019 00:25

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×