Академическое издательство «Гео»

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



KRIOSFERA ZEMLI, 2016, Vol. XX, № 3, p. 71-78

Influence of moisture content on permeability of sandy soils in frozen and unfrozen states

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

Lomonosov Moscow State University, Department of Geology,
119991, Moscow, Leninskie Gory, 1, Russia; chuvilin@geol.msu.ru
*Total EP exploration, Place Jean Millier, 2, Courbevoie, La Défense, 92400, France

Results of experimental studies on the estimation of the permeability of sandy soils with different moisture content in frozen state and after thawing have been presented. The experiments have been performed in a specially designed device allowing the evaluation of gas permeability of samples (3 cm diameter and 3–5 cm length) at various temperature and pressure conditions. During the experiments, the dependencies of the permeability of the sand samples in frozen and thawed states from the degree of saturation by ice or porous water have been obtained. It has been revealed, that the gas permeability is reduced by several orders of magnitude above the critical degree of saturations (40–50 % and 50–55 % for frozen and thawed samples, respectively). The character of dependence of the gas permeability of sandy frozen soils on the degree of saturation is largely determined by their structural features, and first of all by the dependence of ice-cement type on the moisture content. It has been demonstrated that the gas permeability of the sandy samples goes up during thawing. The difference in permeability between the frozen and thawed samples increases proportionally to saturation.

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

DOI: 10.21782/KZ1560-7496-2016-3(71-78)

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