Published Paper Details:

Advanced numerical simulation is required to accurately capture the dynamic impact loads that high-speed rail systems impose on subsurface soils. High-speed rail systems impose dynamic loads that require advanced modeling to accurately assess their impact. This study develops a three-dimensional finite element model in PLAXIS 3D to simulate the dynamic response of a ballasted railway track subjected to high-speed train loading. Two constitutive soil models are evaluated: a simplified Linear Elastic (LE) model and a more advanced Hardening Soil model with Small-Strain stiffness (HSS). While both models provide reasonable predictions of dynamic response under the track, the HSS model demonstrates improved performance in capturing vibration attenuation and settlement behavior in the surrounding soil. The HSS model is attributed to its ability to account for non-linear stress-strain behavior and strain-dependent stiffness degradation, which the LE model does not capture. The findings emphasize the limitations of using purely elastic models for dynamic railway analysis and highlight the benefits of adopting more realistic constitutive models. The HSS model is shown to be more suitable for simulating subsoil behavior under high-speed train loading, particularly in areas where accurate prediction of ground deformation and vibration is critical.