Geotechnical properties and freeze/thaw consolidation behavior of sediment from the Beaufort Sea, Alaska

Soft, fine-grained soils were exposed to cyclic one-dimensional, open-system freezing and thawing, resulting in maximum volume changes of up to 30%, depending on the initial moisture content and plasticity of the clay as well as on the rate of freezing. A linear relationship between the net volume changes subsequent to freezing and thawing and the liquidity index prior to freezing and thawing was obtained. This correlation is not unique, but depends on rate and mode of freezing. Thus, settlements from freezethaw consolidation in the field can be predicted from such tests if the rate and mode of freezing are the same as in the field. During cyclic freezing and thawing the soils became fissured and jointed, resulting for most clays in large increases in their bulk permeabilities, which increased with an increasing number of freezethaw cycles, often by more than two orders of magnitude. For some materials, however, little change in permeability occured. Key words: cyclic freezethaw, clays, freezethaw consolidation, permeability, volume changes.

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Influence of nano-SiO2 on geotechnical properties of fine soils subjected to freeze-thaw cycles

Cold Regions Science and Technology ◽

10.1016/j.coldregions.2019.03.011 ◽

2019 ◽

Vol 161 ◽

pp. 129-136 ◽

Cited By ~ 9

Author(s):

Amir Kalhor ◽

Mahmoud Ghazavi ◽

Mahya Roustaei ◽

S.M. Mirhosseini

Keyword(s):

Geotechnical Properties ◽

Freeze Thaw ◽

Nano Sio2

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Modification of the geotechnical properties, as influenced by freeze–thaw, of granular soils with waste additives

Cold Regions Science and Technology ◽

10.1016/j.coldregions.2006.09.009 ◽

2007 ◽

Vol 48 (1) ◽

pp. 44-54 ◽

Cited By ~ 106

Author(s):

Necmi Yarbaşı ◽

Ekrem Kalkan ◽

Suat Akbulut

Keyword(s):

Geotechnical Properties ◽

Granular Soils ◽

Freeze Thaw

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Geological and Geotechnical Properties of Sediments Offshore Richards Island, Beaufort Sea

10.4095/130149 ◽

1986 ◽

Author(s):

S Potyondy

Keyword(s):

Beaufort Sea ◽

Geotechnical Properties

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Laboratory test study on the effect of freeze–thaw cycles on strength and hydraulic conductivity of high water content stabilized dredged sediments

Canadian Geotechnical Journal ◽

10.1139/cgj-2015-0295 ◽

2016 ◽

Vol 53 (6) ◽

pp. 1038-1045 ◽

Cited By ~ 6

Author(s):

Gregory Makusa ◽

Josef Mácsik ◽

Göran Holm ◽

Sven Knutsson

Keyword(s):

Hydraulic Conductivity ◽

High Water ◽

High Water Content ◽

Initial Water ◽

Dredged Sediments ◽

Freeze Thaw ◽

Test Study ◽

Thaw Consolidation ◽

Permanent Loss ◽

The Impact

Dredged sediments with initial water contents between 200% and 400% were treated with single and composite binders. Samples were subjected to open and semi-closed freeze–thaw (f–t) cycles to investigate the impact of f–t cycling on hydraulic conductivity (HC) and unconfined compressive strength (UCS). A grace period (GP) for thaw consolidation is included to assess healing potential of the affected stabilized mass. Findings of this study show that the impact of f–t cycles depends on initially achieved UCS and HC values prior to the f–t cycling and time of testing after f–t cycles. The HC of specimens with an initial UCS value of 87 kPa increased with number of f–t cycles. The UCS values decreased in the range of 50%–80% when specimens were tested directly after the thaw period and values decreased in the range of 14%–60% when specimens were tested at the end of the GP. The HC of specimens with an initial UCS value of 299 kPa remained almost the same. These samples experienced permanent loss in the UCS values, irrespective of time of testing. Detrimental effects of the freezing action on the UCS were greater under semi-closed than open freezing conditions.

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Freeze-thaw dewatering of oil sands fine tails

Canadian Geotechnical Journal ◽

10.1139/t99-028 ◽

1999 ◽

Vol 36 (4) ◽

pp. 587-598 ◽

Cited By ~ 9

Author(s):

R F Dawson ◽

D C Sego ◽

G W Pollock

Keyword(s):

Oil Sands ◽

Large Scale ◽

Field Experiments ◽

Large Strain ◽

Mine Waste ◽

Freezing Process ◽

Materials Handling ◽

Freeze Thaw ◽

Thaw Consolidation ◽

Input Parameters

Laboratory and field experiments demonstrate that substantial dewatering occurs when the waste clay from oil sands operations is subjected to one cycle of freeze-thaw. The enhanced permeability resulting from the freezing process causes further dewatering and accompanying strength increases during post-thaw consolidation. The findings presented here were guided by a number of different materials handling scenarios which take advantage of the freeze-thaw process and are driven by the appropriate geotechnical, geochemical, and geothermal input parameters. Different conceptual design scenarios are examined to demonstrate how this process might be feasibly implemented at the commercial scale. Emphasis is placed on the large-scale requirements, sensitivity to input parameters, and the coupling of the continuing applied research with the conceptual materials handling models. The latter point is of generic interest to those involved in mine waste management.Key words: mine wastes, freeze-thaw, volume reduction, disposal, large strain consolidation.

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