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TitleLong-term field observations of cyclical and cumulative pipe and ground movements in permafrost terrain, Norman Wells Pipeline, Northwest Territories Canada
AuthorSmith, S LORCID logo; Burgess, M M
SourceGeo2010, proceedings of the 63rd Annual Canadian Geotechnical Conference and the 6th Canadian Permafrost Conference; 2010 p. 595-602
Alt SeriesEarth Sciences Sector, Contribution Series 20100064
Meeting63rd Canadian Geotechnical Conference and the 6th Canadian Permafrost Conference; Calgary; CA; September 12-16, 2010
RelatedThis publication is contained in Evaluating the major controls on permafrost distribution in Ivvavik National Park based on process-based modelling
ProvinceNorthwest Territories
NTS95H/13; 95H/14; 95I/04; 95J; 95N/15; 95N/16; 95O; 96C; 96D/16; 96E/01; 96E/02; 96E/07
AreaNorman Wells; Fort Simpson; Mackenzie River
Lat/Long WENS-127.5000 -121.0000 65.5000 61.7500
Subjectssurficial geology/geomorphology; environmental geology; engineering geology; pipelines; permafrost; freezing ground; ground ice; ground temperatures; Norman Wells Pipeline
Illustrationslocation maps; plots
ProgramEnvironmental Geoscience
Released2010 01 01
AbstractPipe and ground movements have been documented since the mid 1990s at two permafrost sites in the first 5 km of the Norman Wells Pipeline route to investigate the effect of seasonal cycling of oil inlet temperature. Seasonal pipe movements of about 0.2-0.5 m have occurred in response to heave and settlement related to the cyclical pipe and ground temperatures. At one site, where pipe uplift initially occurred in response to the cyclical pipe temperature, a gravel berm has been effective in reversing the upward movement and in reducing seasonal movements. Cumulative pipe settlement up to 0.3 m has occurred at the other site and likely resulted from increasing thaw penetration. Cumulative ground settlement has been greater than 0.3 m.

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