Influence of Boundary Conditions on Temperature of Permafrost Soil under a Building with a Ventilated Basement in Norilsk

   The relevance of research conducted on the influence of boundary conditions on permafrost soil temperature is determined by to the fact that a significant part of Russia is located in the permafrost zone.

   Design and construction of buildings in this area require consideration of the impact of various boundary conditions on the soil temperature. Since instrumental studies of this impact on permafrost soils are labor-intensive and time-consuming, the use of numerical calculation methods to predict changes in frozen soils is highly relevant.

   Purpose: The aim of the study is to analyze the influence of various boundary conditions on the soil freezing depth under a building with a ventilated basement in Norilsk.

   Methodology/approach: Numerical software and laboratory data on thermophysical properties of soil from boreholes at the construction site are used in this work.

   Research findings: It is shown that the lower moisture content in the surface soil layers reduces the impact of phase transitions on thermal inertial properties of the soil, leading to an increased thickness of the active soil layer, where annual temperature fluctuations are observed. The absence of snow cover and direct solar radiation lead to a significant decrease in the soil temperature under the ventilated basement as compared to that under natural conditions and a decrease in the maximum thaw depth. The soil temperature changes over time after the construction completion in the annual cycle under various sections of the building with a ventilated basement and near is in climatic conditions of Norilsk.

   Value: It is shown that insulated building elements can be located directly on the soil surface, and additional thawing of the soil beneath them does not occur.

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