The Effect of the Transformation of Cryolithozone Soils on Their Temperature State at the Base of the Building

The construction of buildings and structures in the areas of distribution of weak water-saturated clay soils requires the improvement of their building properties by creating transformed foundations, for example, using crushed stone pillars. The creation of vertical pillars of crushed stone makes it possible to compact the surrounding soil, reducing its moisture and, thereby, increasing the deformation and strength characteristics of the base before the start of construction. This technology has become widespread in the world practice of soil improvement and has been applied at a number of Russian construction sites in thawed soils. The study of the use of crushed stone pillars for the transformation of soils in the cryolithozone is relevant. The aim was to study the features of the temperature regime of the improved base and its effect on the surrounding permafrost soils. The numerical method in the Frost 3D software was used to model the temperature state of the improved weak loamy base and the surrounding soil mass, taking into account the thermal influence of the building and climate warming for the weather conditions of Yakutsk. The thermal regime of the open ventilated space under a building with a shallow foundation was set. Modeling has shown that the improvement of the base by the crushed stone pillars has a noticeable effect on the temperature distribution in the improved base and the surrounding soil mass: there is a decrease in the temperature of the base and the surrounding soil in the cold period and an increase in the warm period, the thickness of the active layer increases. To prevent an increase in the thickness of the seasonally thawed layer in the improvement zone, it’s recommended to construct a sand embankment.

V.A. ILYICHEV¹, Academician of RAACS, Doctor of Sciences (Engineering), professor (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.S. NIKIFOROVA², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.V. KONNOV³, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Russian Academy of Architecture and Construction Sciences (19, Noviy Arbat, Moscow, 127025, Russian Federation)
² National Research Moscow State University of Civil Engineering (26, Yaroslavskoye Highway, Moscow, 129337, Russian Federation)
³ Scientific-Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (NIISF RAACS) (21, Lokomotivny Driveway, Moscow 127238, Russian Federation)

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