Research methods: Based on the coupling dynamics theory o# vehicle and track, the spatial dynamic model of train and ballastless track and the movement equations of slab laid on the elastic base had been set up. With the developed dynamic simulation software TRACKDYNA, the dynamic performances of the ballastless track in Suining-Chongqing Railway had been studied systematically.
Research results: When the high-speed passenger train，heavy-haul freight train and ordinary train pass, the wheel/ rail vertical force, wheel/rail horizontal force，derailment coefficient, reduction rate of wheel load，dynamic stresses of CA mortar, dynamic stresses of subgrade surface etc. are less than their allowances.
Research conclusions: The dynamics performance of the ballastless track of Suining-Chongqing Railway can meet the design requirement and the structure of track in transition area is rational. For the transition area of double slab ballast track，to reduce the stiffness of rubber cushion under rail of fastening joint at two kinds of track joints in front of double slab can improve the dynamic performance in transition area.
2007, Vol. 24 
