Research purposes: The use of ballastless track is the development trend of heavy-haul railway, and the structural design parameters are the key to carry out the design of ballastless track on the bridge of heavy-haul railway. The system coupled dynamic analysis model of vehicle-track-bridge was established in this paper, and the influence of rail type, track slab width and track slab thickness on the system dynamic characteristics were analyzed. The comprehensive evaluation was evaluated by analytic hierarchy method, and the design parameters of the single layer long sleeper embedded ballastless track were proposed.
Research conclusions: (1) Compared with 60 kg/m rail, the vertical vibration acceleration of vehicle and wheel-rail vertical force increase when 75 kg/m rail is used, and the displacement and force of track structure decrease. (2) With the increase of track slab width and thickness, the track structure vertical displacement increase, and the vibration acceleration of vehicle, wheel-rail vertical force, rate of wheel load reduction, vibration acceleration of bridge, fastener system reaction force and the contact stress between track slab and bridge decrease. (3) The dynamic comprehensive evaluation results of ballastless track decrease with the increase of the width and thickness of track slab. (4) Combined with the dynamic responses and engineering investment, it is suggested that the rail type is 60 kg/m rail, track slab width is 3.0 m and track slab thickness is 0.275 m used for the single layer long sleeper embedded ballastless track on the bridge of heavy-haul railway. (5) The research results can provide reference for structural design parameter values of single layer long sleeper embedded ballastless track on the bridge.
Key words
single layer long sleeper embedded ballastless track /
dynamic responses /
analytic hierarchy method /
designparameters
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References
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