Hydraulic Conductivity of Frozen Granular Soils
Publication: Journal of Environmental Engineering
Volume 122, Issue 3
Abstract
Frozen soil barriers are used for the subsurface containment of liquid contaminants so as to prevent their migration before and during soil remediation. Questions concerning the imperviousness of a frozen soil barrier to liquid contaminants provided the impetus for this study. Hydraulic-conductivity measurements, using a conventional falling-head permeameter with close control on temperature, have been performed on a frozen gravelly sand for ice-saturation levels of 0–100%. The dry frozen soil (−10°C), with decane (a nonaqueous liquid) as the permeant, has a hydraulic conductivity ( K ) about the same as the unfrozen soil would have for water. An increase in ice saturation with a decrease in the open pore space reduced the frozen soil conductivity. At full ice saturation, measured K -values were less than 10 −4 mm/s (10 −5 cm/s). Data show that a clay additive (bentonite) will help retain water so as to give a high degree of ice saturation in a granular soil. The effects of ice erosion in the frozen soil by water-soluble liquid contaminants and brines are introduced.
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Copyright © 1996 American Society of Civil Engineers.
History
Published online: Mar 1, 1996
Published in print: Mar 1996
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