PSI - Issue 72

G. Gusev et al. / Procedia Structural Integrity 72 (2025) 458–463

461

depth, the soil properties (elastic modulus) change sharply (due to the phase transition of ice in the soil skeleton into water) and become equal to the average values of sandy soils - 30 MPa. And the movement of permafrost soil boundary (4) is conditionally uniform, but at different depths, which is confirmed by the survey data. The purpose of the calculations is to evaluate the influence of changes in the properties of the foundation on the deformed state of the structures. It is important to understand in what range the magnitude of vertical and horizontal displacements will vary in order to develop and implement a deformation monitoring system that will be able to control the degradation of elastic properties of permafrost soil.

Fig. 3. Permafrost ground thawing scheme.

3. Results of the study Calculations of deformation behavior of structures on permafrost soil, as well as taking into account thawing of its part to a depth of 1 to 5 meters have been carried out. According to the results of the calculations, the distribution of deformation parameters of the structures was obtained. The data of vertical component of settlements, rolls of structures, as well as distribution of forces in bearing structures of structures were analyzed. If in case of permafrost soil in the base of foundations the picture of vertical displacements is almost uniform and their values are fractions of millimeters, then in case of thawing of permafrost soil the picture of deformation parameters of structures changes dramatically. The scheme of permafrost soil thawing is shown in Figure 3. Pictures of distribution of additional vertical displacements in the group of structures for cases of thawing of the cryolithozone horizon to a depth of 1 to 5 meters from the roof of permafrost soil are presented in the figures below.

Fig. 4. Distribution of additional vertical displacements of buildings in case of cryolithozone roof thawing 1 meter deep.