Part 1 provides general information on some physical properties of water, ice and snow, necessary for understanding the considered non-stationary processes of freezing and thawing of enclosing structures of wet foundation soils. Part 2 provides a physical and mathematical formulation of the problem of freezing of wet soil, the Lame and Clapeyron solution, the Stefan solution, a physical and mathematical formulation of the problem of freezing of a strip foundation. The following are considered: a description of the freezing process of a single-layer enclosing structure, taking into account the phase transformations of moisture in the material of the structure according to V.N. Bogoslovsky and the freezing process of an unlimited plate, taking into account the phase transformations of moisture in the material of the structure according to A.V. Lykov, mathematical model of the non-stationary process of heat transfer in wet layered media. Based on the method of small-time intervals, solutions of boundary value problems for the frozen and thawed zone in the region of large and small Fourier numbers are given. The prospects for using the proposed mathematical models to describe freezing processes of enclosing structurs and foundation soils are outlined. Part 3 presents a physical picture of the process of freezing of a wet (thawing of a frozen) foundation consisting of different soil layers under different boundary conditions on the surface, as well as a mathematical model describing this process. Part 3 is a continuation of Part 2.
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• freezing and thawing of wet foundation soils
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