While maintaining eternal permafrost, the latter should also maintain all its main features and properties unchanged, namely the temperature, the level of the upper boundary of the forever perzed layer and the coefficient of resistance to mechanical efforts, for which the power of eternal permafrost, the physical and mechanical composition of the soil in the frozen state, is studied in detail, The resistance of permafrost on sediment at full load, the presence of warm water flows or groundwater, the depth of the upper boundary of the permafrost, its temperature, the depth of summer survey in the sun and in the shadow and winter freezing in an open and protected place.
