ИСТИНА

The transformation of soil microstructure in soil constructions was reviewed in this work. The studies were conducted during a 4-year experiment on the territory of Lo-monosov Moscow State University (from 2012 to 2016). The method of rheology and scanning electron microscopy were used in this investigation. The object of the study were three variants of soil constructions with different structure of the profiles: 1) variant 1 (control) – its upper part is consisted of a homogenized A arable hori-zon; 2) variant 2 – layered construction, consisted of a series of layers: A arable horizon, peat, sand, A arable horizon; 3) variant 3 – a mixture of the above men-tioned horizons. Scanning electron microscopy revealed an increase in the differenti-ation of the pore space of the upper A arable horizons of variants 1 and 2, the ap-pearance of large associated microstructures in the peat layer of variant 2 and the microstructuring of the upper layer of variant 3. Changes in the spatial organization of the solid phase of soils are reflected in their rheological behavior. Gradual in-crease of the stability of structural relationships in the A arable horizon (variant 1) was discovered during investigation. The influence of the underlying layer of peat on the shape of the rheological curves of the A arable horizon in variant 2 and the transformation of the strength properties of the mixture with the formation of the characteristic rheological behavior of