In cold environments, marine pipelines may be at risk from ice keels that gouge the seabed. Large quantities of material are displaced and soil deformations beneath a gouge may be substantial. To meet safety criteria, excessive strains are avoided by burying pipelines to a sufficient depth. In this paper, a probabilistic approach for the analysis and design of buried pipelines is outlined. Environmental actions are applied through distributions of gouge width, gouge depth, subgouge soil deformations, and bearing pressure. Three-dimensional pipe/soil interaction problem is modeled using nonlinear soil springs and special beam elements using the finite element method to estimate pipe response for statistically possible ranges of gouge depths, gouge widths, and burial depths. Relevant failure mechanisms have been considered, including local buckling and a variety of strain and stress based criteria. The methodology presented in the paper was developed and successfully used for several pipeline and electrical cable projects in ice gouge environments. Significantly reduced burial depth requirements have been demonstrated through the application of the probabilistic approach and through the use of strain-based design criteria. Because ice actions are applied through displacements of the soil, more ductile pipes are often necessary to meet reliability targets.
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August 2007
Technical Papers
Analysis and Design of Buried Pipelines for Ice Gouging Hazard: A Probabilistic Approach
Arash Nobahar
,
Arash Nobahar
Fugro-McClelland Marine Geosciences, Inc.
, Houston, TX 77081
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Shawn Kenny
,
Shawn Kenny
C-CORE
, St. John’s, NL, A1B 3X5, Canada
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Tony King
,
Tony King
C-CORE
, St. John’s, NL, A1B 3X5, Canada
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Richard McKenna
,
Richard McKenna
Consultant
, Ice, Environment and Risk, Wakefield, QC, J0X 3G0, Canada
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Ryan Phillips
Ryan Phillips
C-CORE
, St. John’s, NL, A1B 3X5, Canada
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Arash Nobahar
Fugro-McClelland Marine Geosciences, Inc.
, Houston, TX 77081
Shawn Kenny
C-CORE
, St. John’s, NL, A1B 3X5, Canada
Tony King
C-CORE
, St. John’s, NL, A1B 3X5, Canada
Richard McKenna
Consultant
, Ice, Environment and Risk, Wakefield, QC, J0X 3G0, Canada
Ryan Phillips
C-CORE
, St. John’s, NL, A1B 3X5, CanadaJ. Offshore Mech. Arct. Eng. Aug 2007, 129(3): 219-228 (10 pages)
Published Online: August 3, 2006
Article history
Received:
August 1, 2005
Revised:
August 3, 2006
Citation
Nobahar, A., Kenny, S., King, T., McKenna, R., and Phillips, R. (August 3, 2006). "Analysis and Design of Buried Pipelines for Ice Gouging Hazard: A Probabilistic Approach." ASME. J. Offshore Mech. Arct. Eng. August 2007; 129(3): 219–228. https://doi.org/10.1115/1.2426989
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