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Pipe-soil interaction for surface-laid pipelines on carbonate sands

Pipe-soil interaction for surface-laid pipelines on carbonate sands
Pipe-soil interaction for surface-laid pipelines on carbonate sands
Correctly predicting pipe-seabed interaction (PSI) response is critical for surface-laid pipeline design. Recent updated codes and guidance documents are based on recent research that has mostly been conducted for (undrained) soft clays because the focus has been on HTHP pipelines, mostly in deep water. Consequently, the guidance on pipe-soil interaction behaviour in carbonate soils (as encountered for example, in the Arabian Gulf and the North-West Shelf of Australia) has not been updated, leaving the industry with open ended practices which may lead to questionable design. Pipe-soil interaction in carbonate soils will differ to ‘conventional’ soils (e.g. clays and clean silica sands) because of the higher sensitivities (increasing lay embedment), the higher angles of internal friction (leading to larger pipe-soil interface resistances and axial friction factors), the wider particle size distributions (which lead to soil drainage conditions depending on pipeline loading event) and the high degree of spatial variability. Each of these issues need to be addressed explicitly in any PSI calculation approach (and in the associated site investigation programme) in order to provide reliable pipeline design inputs. Consequently, this paper discusses carbonate soil PSI response and compares the results of PSI tests in carbonate soils to calculations using public domain code- based methods to give general recommendations about pipe-soil interaction on carbonate seabeds.
Deep Foundations Institute
Bransby, M.F.
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Low, Han Eng
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Zhu, Fangyuan
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Clavaud, Romain
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White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Bransby, M.F.
89f400b2-6f20-4b5c-b163-965df69b1f02
Low, Han Eng
8a9ab90a-edd1-46a0-8355-cdd888f40cf7
Zhu, Fangyuan
b342ba0d-8526-4824-b7c6-4932f758f521
Clavaud, Romain
2e9cc708-10de-4df7-b309-752a26645eb7
White, David
a986033d-d26d-4419-a3f3-20dc54efce93

Bransby, M.F., Low, Han Eng, Zhu, Fangyuan, Clavaud, Romain and White, David (2020) Pipe-soil interaction for surface-laid pipelines on carbonate sands. In Proc. International Symposium on Frontiers in Offshore Geotechnics. Deep Foundations Institute. 15 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Correctly predicting pipe-seabed interaction (PSI) response is critical for surface-laid pipeline design. Recent updated codes and guidance documents are based on recent research that has mostly been conducted for (undrained) soft clays because the focus has been on HTHP pipelines, mostly in deep water. Consequently, the guidance on pipe-soil interaction behaviour in carbonate soils (as encountered for example, in the Arabian Gulf and the North-West Shelf of Australia) has not been updated, leaving the industry with open ended practices which may lead to questionable design. Pipe-soil interaction in carbonate soils will differ to ‘conventional’ soils (e.g. clays and clean silica sands) because of the higher sensitivities (increasing lay embedment), the higher angles of internal friction (leading to larger pipe-soil interface resistances and axial friction factors), the wider particle size distributions (which lead to soil drainage conditions depending on pipeline loading event) and the high degree of spatial variability. Each of these issues need to be addressed explicitly in any PSI calculation approach (and in the associated site investigation programme) in order to provide reliable pipeline design inputs. Consequently, this paper discusses carbonate soil PSI response and compares the results of PSI tests in carbonate soils to calculations using public domain code- based methods to give general recommendations about pipe-soil interaction on carbonate seabeds.

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Published date: 16 August 2020

Identifiers

Local EPrints ID: 449399
URI: http://eprints.soton.ac.uk/id/eprint/449399
PURE UUID: 24dff3e8-fa80-4993-9cc7-52fae1b4a9da
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

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Date deposited: 27 May 2021 16:30
Last modified: 13 Dec 2021 03:25

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Contributors

Author: M.F. Bransby
Author: Han Eng Low
Author: Fangyuan Zhu
Author: Romain Clavaud
Author: David White ORCID iD

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