Abstract
A summary is given of some of the main features associated with the thermal properties of soils in cold regions as described in a USACRREL monograph and report. The main effects of the freezing process in soils are noted and its analogy with the drying process is emphasized. It is shown that the unfrozen water present in frozen fine-grained soils plays an important and effective role in facilitating heat transfer. The influence of the degree of saturation is described and the concept of a “critical” degree of saturation introduced. The methods for calculating the thermal conductivity of frozen soils are compared and some of their trends indicated. The results of an evaluation of these methods show which gives the best agreement with measured thermal conductivity values under certain conditions.
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