Analysis of Vehicle-Track Coupled Dynamics Model of Slab Ballastless Track Considering Cohesion Model

The debonding between CA mortar and track slabs has become a typical disease of ballastless tracks for high-speed railways. The interaction of track slab and CA mortar interface is relatively complex, and accurately simulating the bonding relationship between the two is very meaningful for the numerical analysis and damage detection of slab ballastless tracks. This article takes a typical vehicle and the ballastless track slab of CRTSII type as engineering backgrounds. By inserting cohesive elements into the interface of CA mortar and track slab to simulate their bonding effect, a numerical model of the vehicle and track is established by using finite element software. The vibration responses of the track and rails under vehicle load are obtained through coupled dynamic analysis, and the responses of typical measurement points from the track are selected as the verification parameter. It was verified that the model is reasonable by comparing its responses with existing relevant literature values. The research results indicate that the track displacement and acceleration vibration response obtained based on the established model meet the limit values and are close to the values in relevant literature. The slab ballastless track vehicle rail coupling dynamic model considering the cohesive force model can be used as the benchmark model for vehicle-track coupling dynamic analysis.