At present, the territory of urban development is becoming increasingly exposed to dangerous geological processes and phenomena. One of such processes is the waterlogging of the foundation soils caused by various factors including leaks from underground utilities. This article considers how underflooding influencs the base soils's strength and deformation properties when it comes to a five-storey building with brick bearing walls constructed on a strip shallow foundation. The physical characteristics of the soil are given in the article, as well as the results of laboratory tests of clay soil samples with different contents. Strength and deformation characteristics of the clay soil were determined using the compression and single-plane cut methods. After the completion of the tests, the statistical processing of the data was carried out. The obtained regulatory values of the clay soil's characteristics were compared to the values presented in the regulatory and reference literature. The results of the soil's laboratory tests were used to simulate the deterioration of the ground base's characteristics using Plaxis software complex. The calculations were performed in a plain setting using the Mohr-Coulomb model. In the course of numerical modeling, the values of the base soil's additional settlement of a five-storey brick building were determined for various cases of water saturation. At the same time, the gradual deterioration of the base soil's characteristics for each of the considered cases was taken into account depending on the area of soil soaking. Based on the results of the numerical simulation, the most unfavorable cases of water saturation of soil foundations were determined.
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