Uplift resistance of buried pipelines: The contribution of seepage forces
Uplift resistance of buried pipelines: The contribution of seepage forces
Pipelines are commonly buried, and can buckle upwards when heated if there is insufficient soil uplift capacity. Interface tension beneath the buried pipe significantly influences the uplift capacity at shallow embedments. Conventional design approaches, which consider either zero or unlimited interface tension, do not assess and quantify the effect of interface tension on uplift capacity. The present study bridges the gap between conventional “no tension” and “full tension” capacities. Mobilisation of interface tension is governed by seepage forces which in turn directly control the formation of a gap beneath the pipe. A large deformation finite element approach, which simulates this phenomenon of gap formation using a thin layer of gap elements below the pipe, is adopted to study the soil response for various cases of uplift velocity, embedment and soil weight. The enhancement in undrained shear strength of soil at higher uplift velocities due to strain rate effects has also been considered. The interface tension mobilised at these different velocities and embedments varies systematically in a way that is expressed by modifying Hvorslev's intake factors. The proposed expressions may be used with the existing methodologies to assess pipe stability during operation, demonstrated here through a design example.
Buried pipelines, Finite element modelling, Offshore geotechnics, Seepage, Soil-structure interaction, Uplift capacity
Maitra, Shubhrajit
b489a6ef-80c4-48b3-adef-38af109a1596
Chatterjee, Santiram
50e15a93-fc89-47c0-b34f-d7fd389bcfcb
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Choudhury, Deepankar
27111fec-641d-4a14-9b28-853ea3ef4829
15 April 2022
Maitra, Shubhrajit
b489a6ef-80c4-48b3-adef-38af109a1596
Chatterjee, Santiram
50e15a93-fc89-47c0-b34f-d7fd389bcfcb
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Choudhury, Deepankar
27111fec-641d-4a14-9b28-853ea3ef4829
Maitra, Shubhrajit, Chatterjee, Santiram, White, David and Choudhury, Deepankar
(2022)
Uplift resistance of buried pipelines: The contribution of seepage forces.
Ocean Engineering, 250, [111037].
(doi:10.1016/j.oceaneng.2022.111037).
Abstract
Pipelines are commonly buried, and can buckle upwards when heated if there is insufficient soil uplift capacity. Interface tension beneath the buried pipe significantly influences the uplift capacity at shallow embedments. Conventional design approaches, which consider either zero or unlimited interface tension, do not assess and quantify the effect of interface tension on uplift capacity. The present study bridges the gap between conventional “no tension” and “full tension” capacities. Mobilisation of interface tension is governed by seepage forces which in turn directly control the formation of a gap beneath the pipe. A large deformation finite element approach, which simulates this phenomenon of gap formation using a thin layer of gap elements below the pipe, is adopted to study the soil response for various cases of uplift velocity, embedment and soil weight. The enhancement in undrained shear strength of soil at higher uplift velocities due to strain rate effects has also been considered. The interface tension mobilised at these different velocities and embedments varies systematically in a way that is expressed by modifying Hvorslev's intake factors. The proposed expressions may be used with the existing methodologies to assess pipe stability during operation, demonstrated here through a design example.
Text
AM Uplift_resistance_of_buried_pipelines-the_contribution_of_seepage_forces
- Accepted Manuscript
Text
1-s2.0-S0029801822004577-main
- Version of Record
Restricted to Repository staff only
Request a copy
More information
Published date: 15 April 2022
Additional Information:
Funding Information:
The authors are grateful to the Australia-India Council, Department of Foreign Affairs and Trade, Australian Government for the financial support (grant number AIC122-2015) to initiate this collaborative research. The work was initiated between the University of Western Australia (UWA) and the Indian Institute of Technology Bombay, India, when the third author was based at UWA.
Funding Information:
The authors are grateful to the Australia-India Council , Department of Foreign Affairs and Trade, Australian Government for the financial support (grant number AIC122-2015 ) to initiate this collaborative research. The work was initiated between the University of Western Australia (UWA) and the Indian Institute of Technology Bombay, India, when the third author was based at UWA.
Publisher Copyright:
© 2022 Elsevier Ltd
Copyright:
Copyright 2022 Elsevier B.V., All rights reserved.
Keywords:
Buried pipelines, Finite element modelling, Offshore geotechnics, Seepage, Soil-structure interaction, Uplift capacity
Identifiers
Local EPrints ID: 456942
URI: http://eprints.soton.ac.uk/id/eprint/456942
ISSN: 0029-8018
PURE UUID: a508391a-ff55-48c1-a561-0a64a93d12e1
Catalogue record
Date deposited: 17 May 2022 17:03
Last modified: 18 Mar 2024 05:31
Export record
Altmetrics
Contributors
Author:
Shubhrajit Maitra
Author:
Santiram Chatterjee
Author:
Deepankar Choudhury
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
