期刊
TRANSPORTATION GEOTECHNICS
卷 42, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.trgeo.2023.101095
关键词
Vehicle-track-subgrade interaction; Finite element method; Railway engineering; Subgrade stiffness nonlinearity; Subgrade irregularity
In this paper, a subgrade model with nonlinear stiffness is integrated into a 3-D vehicle-track-subgrade (VTS) dynamic model. It accurately predicts the vehicle-induced railroad vibrations and reveals the nonlinear behavior of the subgrade soil.
In this paper, a subgrade model with nonlinear stiffness is established and integrated into a previously con-structed 3-D vehicle-track-subgrade (VTS) dynamic model, in which the prediction and assessment of the vehicle-induced railroad vibrations are achieved with high accuracy and versatility. The system excitations are originated from the initial and time-dependent geometric irregularity of the system, which includes several internal excitations, namely conventional rail irregularity and the soil deformation-induced track irregularity. In the numerical analysis, the nonlinear behavior of the subgrade soil is revealed by considering shear modulus and traffic loads. The numerical experiment indicates that subgrade soil has a greater dynamic stiffness reduction if the vehicle enters the soil region with initial deformations. Besides, it is shown that the soil vibrations will be significantly amplified once the vehicle running speed is larger than the Rayleigh wave velocity of the subgrade soil.
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