Transition Zone between Ballastless and Ballasted Track: Influence of Changing Stiffness on Acting Forces

摘要

The track's ballasted superstructure is a multilayered construction consisting of several constitutive layers. In the slab track for High-Speed Lines, or the embedded track for terminal port stations, a concrete slab replaced the ballast. For the estimation of the increase of the mean value of the static vertical wheel load, a probabilistic approach should generally be adopted in order to cover the statistically desirable safety level. Four calculation methods are cited. An investigation of the change of track stiffness coefficient, both static and dynamic, in Ballasted Track, Transition Zone and Ballastless Track was performed and it is presented.