Abstract
The article is devoted to determining the influence of the strength reduction factor on the interaction that occurs between the soil mass and underground structures. The objectives of this paper are the study of the strength characteristics at the contact of the soil and the material of the structure, the calculation of the strength reduction factor and application it in the numerical simulation of various geotechnical problems. Strength characteristics are obtained on direct shear apparatus. Concrete is used as construction material. The strength reduction factor is calculated as the ratio between the limit shear strength of the soil-concrete and the limit shear strength of the soil-soil. The results of numerical simulation show that when using interface elements and reducing the strength properties at the soil-concrete contact, the displacement of structures, as well as the forces arising in them, will change compared to cases where their interaction is not simulated. In reality, at the contact of the soil mass and underground structures there is a gap and slippage, and the use of interfaces allows more accurately taking into account these processes.
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