Abstract
The contact loss beneath track slab caused by deteriorated cement emulsified asphalt mortar (CA mortar) has been one of the main diseases occurring in the CRTS- (China Railway Track System-) I Slab Track of high-speed railway in China. Based on the slab track design theory and the vehicle-track coupling vibration theory, a vehicle-track vertical coupling dynamic FEM model was established to analyze the influence of the contact loss length on the dynamic characteristics of vehicle and track subsystems at different train speeds. A prototype dynamic characteristic experimental test of CRTS-I Slab Track with CA mortar contact loss was conducted to verify the FEM model results. The train load was generated by the customized ZSS50 excitation car. The results showed that when the operation speed is less than 300 km/h, the contact loss with length smaller than 2.0 m barely affects the running smoothness ride safety of vehicle. The contact loss length effect on the dynamic characteristics of track subsystem is pronounced, especially on the track slab. Once the contact loss beneath the track slab occurs, the vibration displacement and the acceleration of the track slab increase rapidly, while it has little influence on the displacement and acceleration of the concrete roadbed.
Highlights
Nonballasted track, which is smoother and more stable and requires lower maintenance, has been proven to be the best track structure type for high-speed railway [1, 2]
CRTSI Slab Track, which is technically improved from Japanese Shinkansen Slab track, is one of the main nonballasted track types used in Chinese high-speed railways and has been widely applied on Chinese passenger dedicated lines (PDLs), whose total mileage has exceeded 2200 km
The CA mortar of CRTS-I slab track is poured into the bag between track slab and concrete roadbed [6], which leads to the poor connections between CA mortar and track slab and between CA mortar and concrete roadbed
Summary
Nonballasted track, which is smoother and more stable and requires lower maintenance, has been proven to be the best track structure type for high-speed railway [1, 2]. The contact loss beneath track slabs caused by deteriorated CA mortar is the main common disease of CRTS-I Slab Track [7, 8]. It may change the path of force transfer, which will affect the mechanical behavior of structure [9]. It is important to investigate the influence of contact loss beneath track slabs on the dynamic characteristic of slab track
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
