The ultimate undrained resistance of partially embedded pipelines
The ultimate undrained resistance of partially embedded pipelines
On-bottom pipelines for transporting oil and gas in deep water undergo significant changes in temperature and pressure during operating cycles, which cause a tendency for lateral buckling. Prediction and control of this phenomenon are required for the safe design and operation of these pipelines. However, the soil response under combined vertical and lateral loading is a significant area of uncertainty, and current practice relies on empirical expressions for the estimation of lateral pipe-soil resistance. This paper reports the results of finite element (FE) analyses of shallowly embedded pipelines under vertical and horizontal load. These analyses have been compared with collapse loads calculated using the upperbound theorem of plasticity, and are used to construct yield envelopes defining the limiting combinations of vertical and horizontal load. The FE limiting loads were found to compare well with upper-bound plasticity solutions, and the internal soil displacements calculated in the FE analyses match the upper-bound and experimentally observed deformation patterns. The yield envelopes generated by the FE and upper-bound analyses have been fitted by simple solutions, which aid assessment of the ultimate resistance of shallowly embedded pipelines.
Buried structures, Clays, Failure, Numerical modelling and analysis, Offshore engineering, Plasticity, Theoretical analysis
461-470
Merifield, R.
e0df4fb1-76a4-4446-86ef-38bd7481dfec
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
August 2008
Merifield, R.
e0df4fb1-76a4-4446-86ef-38bd7481dfec
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
Merifield, R., White, D.J. and Randolph, M.F.
(2008)
The ultimate undrained resistance of partially embedded pipelines.
Geotechnique, 58 (6), .
(doi:10.1680/geot.2007.00097).
Abstract
On-bottom pipelines for transporting oil and gas in deep water undergo significant changes in temperature and pressure during operating cycles, which cause a tendency for lateral buckling. Prediction and control of this phenomenon are required for the safe design and operation of these pipelines. However, the soil response under combined vertical and lateral loading is a significant area of uncertainty, and current practice relies on empirical expressions for the estimation of lateral pipe-soil resistance. This paper reports the results of finite element (FE) analyses of shallowly embedded pipelines under vertical and horizontal load. These analyses have been compared with collapse loads calculated using the upperbound theorem of plasticity, and are used to construct yield envelopes defining the limiting combinations of vertical and horizontal load. The FE limiting loads were found to compare well with upper-bound plasticity solutions, and the internal soil displacements calculated in the FE analyses match the upper-bound and experimentally observed deformation patterns. The yield envelopes generated by the FE and upper-bound analyses have been fitted by simple solutions, which aid assessment of the ultimate resistance of shallowly embedded pipelines.
This record has no associated files available for download.
More information
Published date: August 2008
Keywords:
Buried structures, Clays, Failure, Numerical modelling and analysis, Offshore engineering, Plasticity, Theoretical analysis
Identifiers
Local EPrints ID: 419860
URI: http://eprints.soton.ac.uk/id/eprint/419860
ISSN: 0016-8505
PURE UUID: 56bb5ece-e137-426a-8fc8-c20eeaa5184b
Catalogue record
Date deposited: 23 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32
Export record
Altmetrics
Contributors
Author:
R. Merifield
Author:
M.F. Randolph
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
