Академическое издательство «Гео»

Gas permeability, sandy soil, frozen soil, thawing, unfrozen soil, moisture content, ice saturation, saturation degree

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«Earth`s Cryosphere», 2016, Vol. XX, № 3, p. 66-72

Influence of moisture content on permeability of frozen and unfrozen soils

E.M. Chuvilin, S.I. Grebenkin, M. Sacleux

Institute of Petroleum Chemistry, SB RAS, 4, Akademichesky ave., Tomsk, 634021, Russia; filatov@ipc.tsc.ru
*Institute of Monitoring of Climatic and Ecological Systems, SB RAS,
10/3, Academichesky ave., Tomsk, 634021, Russia; wosypok@mail.ru

Gas permeability is studied experimentally in samples of wet frozen and thawing sandy soils with different moisture contents, 3 cm in diameter and 3–5 cm in length, using a specially designed system. The variations of permeability in frozen and unfrozen sand samples at different temperatures and pressures are estimated as a function of saturation with ice or water. Permeability becomes several orders of magnitude lower as saturation exceeds the critical values of 40–50 % and 50–55 % for frozen and thawed samples, respectively. The behavior of the saturation dependence of gas permeability in frozen and unfrozen sandy soils is largely controlled by their microstructure, and especially by the type of ice cement between soil grains which, in turn, depends on moisture content. The permeability difference between the frozen and unfrozen sand samples increases proportionally to saturation.

Gas permeability, sandy soil, frozen soil, thawing, unfrozen soil, moisture content, ice saturation, saturation degree
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