Abstract
The debonding of cement emulsified asphalt mortar (CA mortar) is one of the main damage types in China railway track system II slab ballastless track. In order to analyze the influence of mortar debonding on the dynamic properties of CRTS II slab ballastless track, a vertical coupling vibration model for a vehicle-track-subgrade system was established on the base of wheel/rail coupling dynamics theory. The effects of different debonding lengths on dynamic response of vehicle and track system were analyzed by using the finite element software. The results show that the debonding of CA mortar layer will increase the dynamic response of track. If the length of debonding exceeds 1.95 m, the inflection point will appear on the vertical displacement curve of track. The vertical vibration acceleration of slab increases 4.95 times and the vertical dynamic compressive stress of CA mortar near the debonding region increases 15 times when the debonding length reaches 3.9 m. Considering the durability of ballastless track, once the length of debonding reaches 1.95 m, the mortar debonding should be repaired.
Highlights
China railway track system (CRTS) II slab ballastless track is a new type of track structure which is developed on the base of German’s Burger slab ballastless track system
Based on the wheel/rail coupling dynamics theory [10,11,12,13], this paper studied the effect of cement asphalt mortar disease on dynamic performance of CRTS II slab ballastless track
A vertical coupling vibration model for vehicle-tracksubgrade was established according to the finite element method and the wheel/rail coupling dynamics theory
Summary
China railway track system (CRTS) II slab ballastless track is a new type of track structure which is developed on the base of German’s Burger slab ballastless track system. According to the vehicle-track-subgrade interaction principle and finite element theory, Nan [9] established the dynamic finite element model of CRTS II slab ballastless track on subgrade and analyzed the vehicle safety and comfort and dynamic response of the track structure and subgrade. He studied the influence of fastener stiffness, mortar elastic modulus, and the supporting layer of elastic modulus on the ballastless track system. Based on the wheel/rail coupling dynamics theory [10,11,12,13], this paper studied the effect of cement asphalt mortar disease on dynamic performance of CRTS II slab ballastless track
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