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原文传递 MOLDING WATER CONTENT AND HYDRAULIC CONDUCTIVITY OF COMPACTED SOILS SUBJECTED TO FREEZE/THAW.

题名：	MOLDING WATER CONTENT AND HYDRAULIC CONDUCTIVITY OF COMPACTED SOILS SUBJECTED TO FREEZE/THAW.
作者：	Bowders-JJ; Othman-MA
关键词：	COMPACTED-CLAYS; FREEZING-THAWING-EFFECTS; HYDRAULIC-CONDUCTIVITY; WATER-CONTENT; DAMAGE-SEVERITY; PORE-WATER
摘要：	Independent researchers have shown that when compacted clays are subjected to freeze/thaw, they can undergo increases in hydraulic conductivity of one to three orders of magnitude. Existing data have shown that these changes are highly dependent on the initial (before freezing) hydraulic conductivity but not on the plasticity of the soil. The number of freeze/thaw cycles, state of stress, and rate of freezing have the greatest effect on the hydraulic conductivity. It has also been indicated that the availability of water during freezing is critical. In this study, it is shown for closed systems (those with no external water source) that the severity of damage to the soil during freeze/thaw correlates with the volume of water contained in the soil pores and with changes in the hydraulic conductivity. Soils compacted dry of optimum water content can be expected to undergo less than one order of magnitude change in hydraulic conductivity because of freeze/thaw, whereas those compacted wet of optimum can be expected to change by two or more orders. This difference in the magnitude of change suggests that to maintain hydraulic conductivities in compacted soils subjected to freeze/thaw, it may be necessary to compact them dry of optimum--a condition contrary to the practice of constructing low hydraulic conductivity barriers.
总页数：	Transportation Research Record. 1994. (1434) pp55-60 (6 Fig., 4 Tab., 21 Ref.)
报告类型：	科技报告