Abstract
In order to study the vertical dynamic characteristics of the composite sleeper ballasted track in tunnels, this paper establishes a dynamic model based on the finite element method, and compares the dynamic response of vehicle, wheel and rail systems, track systems and backfill layer with the type-III concrete sleeper. The research results show that the composite sleeper ballasted tracks’ acceleration of the car body and the wheel-rail force are smaller than that of the type-III sleeper. It can meet the safety of the train and passenger comfort. Because the composite sleeper has good elasticity, The rail displacement and acceleration, the sleeper displacement and acceleration of the composite sleeper are slightly larger than the type-III sleeper ballasted track, but the effect is not great. The composite sleeper has good elasticity and large damping, so that the acceleration of the track bed and the backfill layer is less than that of the type-III sleeper ballasted track. This shows that the composite sleeper has vibration damping characteristics for the track bed and the backfill layer.
Highlights
In order to study the vertical dynamic characteristics of the composite sleeper ballasted track in tunnels, this paper establishes a dynamic model based on the finite element method, and compares the dynamic response of vehicle, wheel and rail systems, track systems and backfill layer with the type-III concrete sleeper
The dynamic characteristics of the composite sleeper ballasted track are studied, and the dynamic model is established to study the dynamic characteristics of the vehicle, track structure and foundation, and provide theoretical basis for its application
It can be seen from the figure that the acceleration of the car body under the composite sleeper structure is 0.0398m/s2, which is slightly larger than the 0.0297m/s2 of the type-III concrete sleeper
Summary
It can be seen from the figure that the acceleration of the car body under the composite sleeper structure is 0.0398m/s2, which is slightly larger than the 0.0297m/s2 of the type-III concrete sleeper. According to the regulations of China's high-speed railway, the vertical acceleration of the car body is not more than 0.13. G, the composite sleeper ballasted track meet the requirements of stability and comfort
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