In this paper design and construction of subgrade in comprehensive experimental section of ballastless track on Suining-Chongqing line based on the experimental research,three key technologies of ballastless track subgrade of passenger traffic special line are discussed,which include the control of foundation settlement,the longitudinal stiffness matching of under-rail foundation,and the rational use of not-fine subgrade materials.
The match between the springiness of the flexible coupling and the stiffness of axle-box rods should be so chosen as to avoid resonance in the driving system.