Abstract
The problem of modelling of a seismic impact on a railway roadbed is examined. The modelling was conducted with the use of a generated accelerogram. Calculations of the stress-strain state of the roadbed during an earthquake are made with the GEO5 FEM program complex. The stress and deformation values in the construction of the roadbed considering several geometric parameters of the calculation scheme, physical and dynamical properties of soil are presented. The nature of the impact of these factors on the stress-strain state during an earthquake is detected. The effectiveness of the use of the finite-element method for the dynamic calculations of a soil construction considering the seismic impact is reasoned. The soil constructions with a damping layer serving to reduce the seismic negative effect are calculated. The dependences of stresses and deformations in the roadbed on the damping parameters are detected. The possibility to reduce the deformations and stresses in the roadbed during a seismic impact with the use of the damping layer or the use into the qualities of the material for the soil mounds with definite dynamical and physical characteristics is established.
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