Field observation (Parmuzina, 1978; Mackay, 1983) and experemental works (Ershov, 1979; Xiaozu Xu a.o.,1987) have been show a migration of unfrozen water in frozen ground in some range of negative temperature. E. D. Ershov had pointed too that a migration of water from thawed ground isn't limited by freezing front but it continue inside frozen one on some distans with certain boundary temperature.
But this phenomena and its cryogenetic results weren't studied enough therefore the special program of experiments was elaborated and realize together with chinese collegues in well equiped by precise thermoappaties in Key Laboratory of frozen soil engineering of Glaciology and Geocryology Institut, Lanzhou, China.
The samples of loam with different but random distributed initial ice content were placed in sample container which had temperature -1 C and +1 C on opposite ends. In such condition each sample was kept during 120 hours. After that a cryogenetic structure and water content along sample's axis were studied.
The results show that in all samples thawed part is dehidrated and a water content of frozen one increase in all its volume, but especialy in layer close to boundary frozen-thawed ground. Simultaneously a ground heaving is developed. In frozen part of samples (6-7cm height) next cryostructure featires were formed: 1) On top table of frozen ground ice lens-layer structure or pure layer of segregation ice arised by thickness 1-2 cm; 2) Lower a layer with massive structure was observed by thickness 3-4 cm; 3) A Schistose structure layer probably as result of more and less dense soil interchanging. On cold bottom end of some samples thin ice layer was grown, mostly those with the higher initial water contents. Possibly it is evidence of lower temperature limit then -1 C for water migration in such type of ground that was used in the experiments. A thin subvertical veins of ice were formed as result of heaving ground deformation.
The experimental data allow to explane some natural phenomenon in top horizon of permafrost and in active layer.
Prof. V.I. Solomatin Moscow State University 119899 Vorobjovy Hills, Geography Faculty Vorobjery, Gory Moscow, RUSSIA Telephone: 1095 2647347(OF), 2423633(H) Fax: 0959328836