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UBC Theses and Dissertations
Static, cyclic and post liquefaction undrained behaviour of Fraser river sand Thomas, Joyis
Abstract
An experimental study of static, cyclic and post cyclic undrained behaviour of Fraser river sand in the triaxial test is presented. Static undrained behaviour over a range of deposition densities, from loosest to dense, and a range of confining stress is studied. Compression as well as extension loading paths are included. It is shown that for identical density and stress state the sand is dilative in triaxial compression but contractive in triaxial extension loading. It is shown that at a given confining stress static shear stress can change a dilative sand into a contractive one. Cyclic loading leading to liquefaction is studied at specific targeted densities from loose to dense at a range of confining stress and the liquefaction resistance determined. It is shown that the sand can undergo large deformation even before a state of 100% pore pressure ratio occurs. There is no effect of the level of confining stress on liquefaction resistance of loose sand. The resistance of denser sand, however, decreases with increase in confining stress. During post liquefaction undrained monotonie loading, the sand initially deforms with an essentially zero stiffness which then increases with the level of strain.The effect of maximum shear strain due to cyclic loading, relative density, mode of loading and the level of confining stress prior to cyclic loading on the post liquefaction monotonic undrained response of the sand is investigated. Volumetric strain due to dissipation of excess pore pressure until liquefaction is assessed as a function of maximum shear strain, relative density and confining stress prior to inducing liquefaction. The similarity of post liquefaction behaviour (both stress-strain response and volumetric strain) between sand brought to the liquefied state by cyclic loading and by static load/unload cycle is also investigated.
Item Metadata
Title |
Static, cyclic and post liquefaction undrained behaviour of Fraser river sand
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1992
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Description |
An experimental study of static, cyclic and post cyclic undrained behaviour of Fraser
river sand in the triaxial test is presented. Static undrained behaviour over a range of deposition
densities, from loosest to dense, and a range of confining stress is studied. Compression as well
as extension loading paths are included. It is shown that for identical density and stress state
the sand is dilative in triaxial compression but contractive in triaxial extension loading. It is
shown that at a given confining stress static shear stress can change a dilative sand into a
contractive one.
Cyclic loading leading to liquefaction is studied at specific targeted densities from loose
to dense at a range of confining stress and the liquefaction resistance determined. It is shown
that the sand can undergo large deformation even before a state of 100% pore pressure ratio
occurs. There is no effect of the level of confining stress on liquefaction resistance of loose
sand. The resistance of denser sand, however, decreases with increase in confining stress.
During post liquefaction undrained monotonie loading, the sand initially deforms with
an essentially zero stiffness which then increases with the level of strain.The effect of
maximum shear strain due to cyclic loading, relative density, mode of loading and the level
of confining stress prior to cyclic loading on the post liquefaction monotonic undrained
response of the sand is investigated. Volumetric strain due to dissipation of excess pore
pressure until liquefaction is assessed as a function of maximum shear strain, relative density
and confining stress prior to inducing liquefaction. The similarity of post liquefaction behaviour
(both stress-strain response and volumetric strain) between sand brought to the liquefied state
by cyclic loading and by static load/unload cycle is also investigated.
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Extent |
2722770 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2008-12-18
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0050443
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1992-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.