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dc.contributor.advisorSturm, Terry W.
dc.contributor.authorWang, Yung-Chieh (Becky)
dc.date.accessioned2014-05-12T19:13:24Z
dc.date.available2014-05-12T19:13:24Z
dc.date.issued2013-04-08
dc.identifier.urihttp://hdl.handle.net/1853/51723
dc.description.abstractDuring high flow rates, the acceleration of flow and turbulence around bridge foundations lead to scouring, defined as the removal of bed sediments. Due to the interparticle physico-chemical forces of clay particles, erodibility and transport mechanisms for fine sediments are different from those for coarse sediments, and the capability to predict the erosion resistance of fine sediments is still in question. In this study, silt-clay soil mixtures with different kaolin contents were prepared by mixing ground silica and Georgia kaolin with tap water. Geotechnical tests were carried out to obtain the physical properties of the specimens. The critical shear stress and yield stress of the soil mixtures were determined through hydraulic flume experiments and rheometer tests, respectively. Particle associations of the soil specimens were observed using the technique of scanning electron microscopy (SEM). From the laboratory work and data analysis, relationships among the critical shear stress, yield stress, and the soil physical properties were developed from multiple regression analysis. Specifically, values of the critical shear stress, yield stress, and their dimensionless form can be predicted by the soil properties including bulk density, clay content, and water content. Finally, a single relationship is obtained to predict the Shields parameter as a function of the corresponding dimensionless yield stress in this study. The results can be used to provide a methodology for engineering applications requiring the value of critical shear stress such as estimating fine sediment bed stability and assessing the erosion risk of river beds in proximity to bridge foundations and other flow obstructions.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectCritical shear stressen_US
dc.subjectYield stressen_US
dc.subjectFine-grained sedimenten_US
dc.subjectSediment transporten_US
dc.subject.lcshSediments (Geology)
dc.subject.lcshSedimentation and deposition
dc.subject.lcshSediment transport
dc.subject.lcshShear (Mechanics)
dc.subject.lcshScour at bridges
dc.titleEffects of physical properties and rheological characteristics on critical shear stress of fine sedimentsen_US
dc.typeDissertationen_US
dc.description.degreePh.D.
dc.contributor.departmentCivil and Environmental Engineering
dc.embargo.termsnullen_US
thesis.degree.levelDoctoral
dc.contributor.committeeMemberBurns, Susan E.
dc.contributor.committeeMemberJacob, Karl I.
dc.contributor.committeeMemberRoberts, Philip J.
dc.contributor.committeeMemberWebster, Donald R.


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