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Roadbed thermal conditions in permafrost are subject to seasonal changes affecting roadway resilience. A roadbed thawing depth is important for road base processing, especially in permafrost. This research had the purpose of evaluation of a permissible roadbed thawing depth based on the Biot number reflecting general thermal resistance of roadbed layers. These results will contribute to understanding road bed thermal resistance and selection of roadway construction materials.

In continuation of the previously published research results (Energy Safety and Energy Economy, iss. 1, 2021), the current study investigates thermal insulation efficiency for underground structures in permafrost conditions. Thermal insulation experiences the influence of various factors affecting its efficiency. For the purpose of this research, said efficiency was evaluated by intensity of heat flow from air to the ground. The non-stationary heat transfer coefficient, the so-called Kirpichev number, reflects for heat flow intensity. The 3D diagrams show the results of the study with a large data coverage for proper evaluation of thermal insulation efficiency of underground structures in permafrost. The results confirm that thermal insulation can be considered effective both for short-term and long-term underground workings.

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