A Parametric Study of Embedded Slab Track System for High-Speed Applications on Cohesive Subgrade

The present study deals with identifying the best parameter to represent the dynamic response of a slab track. A comparison between the continuously supported embedded track system (ETS) with the discretely supported Rheda track system (RTS) is made. A three-dimensional geometry was modeled, and finite element analysis was performed with a moving load. The subgrade is modeled with the Mohr-Coulomb plasticity while all other layers as linearly elastic. A moving load is applied over an area with different speeds ranging from 90 to 540 km/h. Parametric studies on the thickness of HBL and FPL and stiffness of CBL and subgrade are performed. The time-history data were obtained and analyzed using the area under curves (AUC) and maximum parameter value (MAX). The linear fit parameters, i.e., R-squared values representing the goodness of fit and slope of the linear fit, are analyzed for vertical displacement, vertical stress, and vertical velocity. It was found that the vertical velocity response best represents the dynamic effect of moving load. The ETS performs similarly to the RTS under a static vertical load. The subgrade stiffness and CBL thickness will affect the rail track response the most.