THE SOIL THERMAL PROPERTIES IN THE IMPACT ZONE OF RAILWAY IN CENTRAL YAKUTIA

The problem of the thermal reaction of the upper ice horizons of the cryolithozone on the technogenic impact of linear structures was considered on the example of the railway in extreme geotechnical conditions and modern climate warming. The relevance, scientific and practical significance of the problem under study are substantiated, the features of the geocryological conditions of the work site are briefly characterized. The technique and organization of the observation network of the experimental railway construction site are considered. The results of engineering-geocryological monitoring of the railway line Tommot – Nizhny Bestyakh on the area of distribution of rocks of the ice complex, where innovative design was used, are presented. The thermal dynamics of the subgrade and embankment soils were quantified associated with the wide use of thermosyphons and insulation materials. The observations indicated a rise in the permafrost table and cooling of the subgrade under high and low embankments, and increased seasonal thaw depths and ground temperature warming on the right-of-way along the railroad. Where a zero embankment was placed with removal of the active layer, perennial thaw bulbs developed in the subsoil. Degradation of ice-rich permafrost was observed on the cut slopes and ditches in the cut sections. Thermosyphons on the berms in combination with Penoplex insulation showed a cooling effect on the subgrade and permafrost table. Overhanging snow sheds on the embankment slopes proved to be beneficial for reducing subgrade temperatures. The experimental data serve an information basis for the forecast of the thermal regime of the soil of the base of the roadbed and the surrounding area in a changing climate.

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