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Upper bound plasticity analysis of a partially-embedded pipe under combined vertical and horizontal loading

Upper bound plasticity analysis of a partially-embedded pipe under combined vertical and horizontal loading
Upper bound plasticity analysis of a partially-embedded pipe under combined vertical and horizontal loading

Seabed pipelines undergo temperature cycles that create axial load which can be relieved through controlled lateral buckling. The prediction of lateral buckling in design requires accurate assessment of the lateral breakout resistance. This Technical Note describes upper bound plasticity analysis of a partially-embedded pipe on undrained soil. The purpose is to generate failure envelopes for vertical and horizontal loading to provide a theoretical basis for estimating breakout resistance. The following cases have been considered: smooth and rough pipes, with and without separation at the rear face of the pipe. The envelopes are similar to those developed previously for surface foundations, but capture additional effects that are due to the curved geometry of the pipe surface. The breakout resistance and the movement of the pipe at failure are strongly influenced by the separation condition. Pipe roughness and soil self-weight have a relatively minor effect on breakout resistance. Existing empirical expressions usually assume a linear variation in breakout resistance with embedment and vertical load. This theoretical analysis demonstrates that these relationships are non-linear. The resulting envelopes provide a more rigorous basis for predicting the breakout resistance of partially-embedded pipelines.

Plasticity theory, Soft clay, Undrained shear strength (IGC: E3)
0038-0806
133-140
Cheuk, C.Y.
4fd1f770-b1c1-4d15-b1b2-464c7a2a0d86
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Dingle, H.R.C.
50a2a278-9699-48c1-a991-65f4e1a0cb06
Cheuk, C.Y.
4fd1f770-b1c1-4d15-b1b2-464c7a2a0d86
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Dingle, H.R.C.
50a2a278-9699-48c1-a991-65f4e1a0cb06

Cheuk, C.Y., White, D.J. and Dingle, H.R.C. (2008) Upper bound plasticity analysis of a partially-embedded pipe under combined vertical and horizontal loading. Soils and Foundations, 48 (1), 133-140. (doi:10.3208/sandf.48.133).

Record type: Article

Abstract

Seabed pipelines undergo temperature cycles that create axial load which can be relieved through controlled lateral buckling. The prediction of lateral buckling in design requires accurate assessment of the lateral breakout resistance. This Technical Note describes upper bound plasticity analysis of a partially-embedded pipe on undrained soil. The purpose is to generate failure envelopes for vertical and horizontal loading to provide a theoretical basis for estimating breakout resistance. The following cases have been considered: smooth and rough pipes, with and without separation at the rear face of the pipe. The envelopes are similar to those developed previously for surface foundations, but capture additional effects that are due to the curved geometry of the pipe surface. The breakout resistance and the movement of the pipe at failure are strongly influenced by the separation condition. Pipe roughness and soil self-weight have a relatively minor effect on breakout resistance. Existing empirical expressions usually assume a linear variation in breakout resistance with embedment and vertical load. This theoretical analysis demonstrates that these relationships are non-linear. The resulting envelopes provide a more rigorous basis for predicting the breakout resistance of partially-embedded pipelines.

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More information

Published date: 2008
Keywords: Plasticity theory, Soft clay, Undrained shear strength (IGC: E3)

Identifiers

Local EPrints ID: 419861
URI: https://eprints.soton.ac.uk/id/eprint/419861
ISSN: 0038-0806
PURE UUID: 6e09766c-237e-4061-af0c-fd023cba5e15
ORCID for D.J. White: ORCID iD orcid.org/0000-0002-2968-582X

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Date deposited: 23 Apr 2018 16:30
Last modified: 14 Mar 2019 01:24

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Contributors

Author: C.Y. Cheuk
Author: D.J. White ORCID iD
Author: H.R.C. Dingle

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