Elastoplastic consolidation solutions for scaling from shallow penetrometers to pipelines
Elastoplastic consolidation solutions for scaling from shallow penetrometers to pipelines
The build-up of friction on seabed pipelines is an important design consideration, affecting their stability and the resulting in-service strain and fatigue. The consolidation beneath a partially embedded pipeline has been investigated in the past and linked to the build-up of axial pipe-soil resistance. This paper extends previous work by providing solutions for consolidation around a new class of shallow penetrometer, to provide a basis to scale from site investigation results directly to the build-up of pipeline friction. Small-strain finite element analyses, using the Modified Cam Clay soil model, are presented for the novel toroid and ball penetrometers. The effects of initial penetrometer embedment, device roughness, strength gradient, and overload ratio have been explored in a comprehensive manner, and are compared with pipe results. The toroid penetrometer shows excellent agreement with an element of an infinitely long pipe, simplifying the scaling process. The ball penetrometer shows a faster consolidation response, typically by a factor of three, reflecting the more effective drainage mechanisms of a three-dimensional device compared to a plane strain device. The dissipation responses are fitted by simple equations to aid application in design.
Numerical analysis, Offshore engineering, Penetrometers, Pipelines, Plasticity
881-895
Yan, Y.
0ea17eac-c4fa-4c9b-9121-d4b3b324e7dc
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
1 June 2017
Yan, Y.
0ea17eac-c4fa-4c9b-9121-d4b3b324e7dc
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
Yan, Y., White, D.J. and Randolph, M.F.
(2017)
Elastoplastic consolidation solutions for scaling from shallow penetrometers to pipelines.
Canadian Geotechnical Journal, 54 (6), .
(doi:10.1139/cgj-2016-0286).
Abstract
The build-up of friction on seabed pipelines is an important design consideration, affecting their stability and the resulting in-service strain and fatigue. The consolidation beneath a partially embedded pipeline has been investigated in the past and linked to the build-up of axial pipe-soil resistance. This paper extends previous work by providing solutions for consolidation around a new class of shallow penetrometer, to provide a basis to scale from site investigation results directly to the build-up of pipeline friction. Small-strain finite element analyses, using the Modified Cam Clay soil model, are presented for the novel toroid and ball penetrometers. The effects of initial penetrometer embedment, device roughness, strength gradient, and overload ratio have been explored in a comprehensive manner, and are compared with pipe results. The toroid penetrometer shows excellent agreement with an element of an infinitely long pipe, simplifying the scaling process. The ball penetrometer shows a faster consolidation response, typically by a factor of three, reflecting the more effective drainage mechanisms of a three-dimensional device compared to a plane strain device. The dissipation responses are fitted by simple equations to aid application in design.
Text
Yan et al 2017 AM
- Accepted Manuscript
More information
Accepted/In Press date: 3 February 2017
e-pub ahead of print date: 4 February 2017
Published date: 1 June 2017
Keywords:
Numerical analysis, Offshore engineering, Penetrometers, Pipelines, Plasticity
Identifiers
Local EPrints ID: 418219
URI: http://eprints.soton.ac.uk/id/eprint/418219
ISSN: 0008-3674
PURE UUID: 2506c6d2-20ae-4864-a659-9cc79d44db15
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Date deposited: 23 Feb 2018 17:30
Last modified: 18 Mar 2024 03:42
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Author:
Y. Yan
Author:
M.F. Randolph
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