期刊
CANADIAN GEOTECHNICAL JOURNAL
卷 43, 期 3, 页码 325-337出版社
NATL RESEARCH COUNCIL CANADA
DOI: 10.1139/T06-006
关键词
frozen soil; salinity; frost penetration; thermal conductivity
Unfrozen water is very important because it has a significant influence oil the mechanical. response of a frozen soil. It is particularly important to know if the water is available as free water or if it is bonded to the solid particles. A simple experimental setup was used to observe the freezing process of a coarse-grained soil under controlled freezing gradients and salinities. A fluorescent tracer helped to determine the location of the unfrozen water during freezing. Depending on the salinity and the thermal gradient, pockets of unfrozen water with a much higher salt concentration were trapped in pores under increased pore pressures. Even at salinities as low as 2 g/L, spicular ice crystals were identified with channels containing unfrozen water between the ice crystals. The experiments further indicate that the unfrozen water in coarse-grained frozen soils is in the middle of the pore space compared to the unfrozen water film that immediately surrounds fine-grained saline or non-saline soil particles.
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