The determination of the physical and mechanical properties of soils and soft overburden rocks is an important part of the engineering and geological studies both in development of mineral deposits and in the civil engineering. The reliable values of such parameters as cohesion and internal friction angle available from experiments determine the stability and reliability of various facilities and technical installations during their construction and operation. Purpose. To perform the laboratory tests of physical and mechanical properties of soils and soft overburden rocks and their shear strength parameters. Methodology. The paper describes the method of the shear test of soil and soft overburden rock by means of direct shear device PS-10 with a fixed cut plane. The monolithic undisturbed soil samples were selected from the slopes of Yevpatoriyskaya ravine in the city of Dnipropetrovsk. When the samples are loaded by critical values of vertical and tangential loads in the operating space of the shear device, the cartridge shifting occurs and shear deformations in the soil sample are observed in the form of horizontal cut. The measurement of soil strength properties and shear strength parameters were determined at different values of moisture. The values of moisture content in samples were measured by the KERN MLB hydrometer. Findings. Laboratory tests of the subsiding soil samples with undisturbed structure and different values of moisture content allowed us to determine the following physical and mechanical properties: shear strength tau, internal friction angle phi and specific cohesion C. Originality. As a result of numerous experiments the dependencies of shear strength parameters of soils and soft overburden rocks from the slopes of Yevpatoriyskaya ravine on the moisture content have been obtained. It allowed establishing patterns of relationship between the physical and mechanical properties of the soft rocks and the degree of their moisture saturation. Practical value. The application of the reliable experimental data obtained from the shear tests for soils and soft rocks is useful for the assessment of stability of natural slopes, man-made and bulk rock massifs, as well as civil engineering objects.

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