On the undrained unloading behaviour of gassy soils

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dc.contributor.advisorGrozic, Jocelyn L.H.
dc.contributor.authorAmaratunga, Anupama Samanmali
dc.date.accessioned2017-12-18T21:09:21Z
dc.date.available2017-12-18T21:09:21Z
dc.date.issued2006
dc.descriptionBibliography: p. 156-162en
dc.description.abstractSoils that contain large amounts of dissolved gas within the pore fluid are called gassy soils. Gassy soils are common in marine environments and it is important to further our understanding of the unloading behaviour of gassy soils because of their potential to initiate and propagate submarine slope failures. This thesis focuses on the pore pressure responses and volumetric strains of loose gassy sands under different undrained unloading stress paths in laboratory specimens. Special attention was given to the constant deviatoric stress (q-constant) undrained unloading stress path as it simulates the stress condition imposed by tidal drawdown; one of the potential triggers of landslides in gaseous marine sediments. Gas exsolution was observed when the pore pressure was reduced below the liquid gas saturation pressure. Upon further decreases in total stress, the resulting pore pressure change was much less than the total stress change; hence effective stress decreased rapidly, and at some point the samples tested under q-constant stress path collapsed. This thesis has experimentally and theoretically shown that gas in free and/or dissolved form is detrimental in undrained unloading stress paths.
dc.format.extentxx, 165 leaves : ill. ; 30 cm.en
dc.identifier.citationAmaratunga, A. S. (2006). On the undrained unloading behaviour of gassy soils (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/471en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/471
dc.identifier.urihttp://hdl.handle.net/1880/101472
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleOn the undrained unloading behaviour of gassy soils
dc.typemaster thesis
thesis.degree.disciplineCivil Engineering
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 1626 520492143
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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