The present paper is aimed at the research into stress state of a roadbed reinforced with a soil-concrete layer and being exposed to the impact of heavy-tonnage trains with axle load of 245-295 kN/axle. To assess the effect of soil-concrete layer on the stress state of the roadbed, multivariable calculation tests were performed via the finite element method. Graphs of equivalent tensile stresses in the models of railroad were obtained, as well as graphs of normal horizontal and vertical stress components that arise in the subgrade of the railroad. The calculation results obtained show that as far as the axle load of a train increases, stress state of a model changes, areas of critical stress values for soils in a railroad’s subgrade grow. In a railroad model that is reinforced with a soil-concrete layer, areas of critical stresses are less than in a non-reinforced model. Allowable stress exceeds in a subgrade when a train with an axle load of 294 kN/axle impacts a railway model of a standard structure. When a roadbed is reinforced with a soil-concrete layer, the stress arising is less than the maximum allowed value. The results obtained allow recommending to use a soil-concrete layer for the reinforcement of roadbeds of railway tracks designed for heavy-tonnage train traffic.
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