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  • http://hdl.handle.net/10402/era.25691
  • Laboratory Study of Freeze-Thaw Dewatering of Albian Mature Fine Tailings (MFT)
  • Zhang, Ying
  • English
  • freeze-thaw
    dewatering
    tailings
    MFT
    finite strain consolidation
    freezing
  • Mar 6, 2012 9:57 AM
  • Thesis
  • English
  • Adobe PDF
  • 3255752 bytes
  • 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.
  • Master's
  • Master of Science
  • Department of Civil and Environmental Engineering
  • Geotechnical Engineering
  • Spring 2012
  • Sego, Dave (Civil and Environmental Engineering)
  • Wilson, Ward (Civil and Environmental Engineering)
    Joseph, Timothy (Civil and Environmental Engineering)
    Chanasyk, David (Renewable Resources)