Show simple item record

dc.contributor.advisorFleming, Ian R.en_US
dc.creatorJogi, Manojen_US
dc.date.accessioned2005-12-12T15:08:24Zen_US
dc.date.accessioned2013-01-04T05:10:19Z
dc.date.available2005-12-12T08:00:00Zen_US
dc.date.available2013-01-04T05:10:19Z
dc.date.created2005-09en_US
dc.date.issued2005-09-06en_US
dc.date.submittedSeptember 2005en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-12122005-150824en_US
dc.description.abstractGeomembranes are one of the most widely used geosynthetics in various civil engineering applications. Their primary function is as a barrier to liquid or vapour flow. Smooth Geomembranes are frequently used in combination with different soils, and due to their low surface roughness, are challenging to design to ensure adequate shear strength along the smooth geomembrane-soil interface. It is important to use the appropriate values of interface shear strength parameters in the design of slopes incorporating one or more geomembranes in contact with soils. The parameters are determined by conducting direct shear test on the geomembrane-soil interface. Laboratory tests of interface shear strength for geomembranes and soil are typically carried out with no provision for measurement of pore pressures at the soil/geomembrane interface. This thesis deals with study of smooth geomembrane-soil interfaces, particularly under unsaturated conditions. The various factors that affect the interface shear behaviour are also studied. The tests were conducted using a modified direct shear box with a miniature pore pressure transducer installed adjacent to the surface of the geomembrane. Geomembrane–soil interface shear tests were carried out with continuous measurement of suction in close proximity to the interface during the shearing process thus making it possible to analyze test results in terms of effective stresses. The method was found to be suitable for unsaturated soils at low values of matric suction. Results of interface shear tests conducted using this method show that it is quite effective in evaluating interface shear behaviour between a geomembrane and an unsaturated soil. The results suggest that soil suction contributes to shearing resistance at low normal stress values. At lower normal stress values, the interface shear behaviour appears to be governed only by the magnitude of total normal stress. At high normal stresses, the failure mechanism changed from soil particles sliding at the surface of geomembrane to soil particles getting embedded into the geomembrane and plowing trenches along the direction of shear. A plowing failure mechanism resulted in the mobilization of significantly higher shear strength at the geomembrane soil interface. It was found that placement water contents near saturated conditions results in lower effective stresses, a shallower plowing mechanism and lower values of mobilized interface shear strength.en_US
dc.language.isoen_USen_US
dc.subjectsurface roughnessen_US
dc.subjectinterface shear strengthen_US
dc.subjectpore-water pressureen_US
dc.subjectunsaturated conditionsen_US
dc.subjectgeomembraneen_US
dc.titleA method for measuring smooth geomembrane/soil interface shear behaviour under unsaturated conditionsen_US
thesis.degree.departmentCivil Engineeringen_US
thesis.degree.disciplineCivil Engineeringen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberSharma, Jitendraen_US
dc.contributor.committeeMemberGan, Julianen_US
dc.contributor.committeeMemberBarbour, S. Leeen_US
dc.contributor.committeeMemberSparling, Bruce F.en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record