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Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT) Open Access


Other title
finite strain consolidation
Type of item
Degree grantor
University of Alberta
Author or creator
Zhang, Ying
Supervisor and department
Sego, Dave (Civil and Environmental Engineering)
Examining committee member and department
Chanasyk, David (Renewable Resources)
Joseph, Timothy (Civil and Environmental Engineering)
Wilson, Ward (Civil and Environmental Engineering)
Department of Civil and Environmental Engineering
Geotechnical Engineering
Date accepted
Graduation date
Master of Science
Degree level
Tailing ponds in Northern Alberta has covered an area of 170 km2. Directive 074 issued in 2009 set stringent criteria for tailings reclamation. Freeze-thaw dewatering is one of the most promising approaches for dewatering MFT as one cycle of freeze-thaw can release up to 50% pore water. In this research, freezing tests were conducted with different temperature boundaries. A lower freezing rate induced higher solids content and higher undrained shear strength. In addition, finite strain consolidation tests were performed on both as-received and frozen/thawed MFT. Freeze-thaw decreased the compressibility to about half that of as-received MFT and increased the permeability to 6 times that of as-received MFT with the same void ratio. Both compressibility and permeability curves converged at higher effective stress (σ’=100 kPa). The coefficient of consolidation of frozen/thawed MFT was larger at lower effective stress and smaller at higher effective stress, comparing with that of as-received MFT. These results can be used to predict the field behaviors of Albian MFT and optimize the application of freeze-thaw dewatering.
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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