The Influence Properties on CRTS II Ballastless Track under Uneven Subgrade Settlement

In order to investigate the deformation and mechanical property of CRTSII slab ballastless track during uneven settlement after subgrade construction, taking a 60 m long soil subgrade line on the Beijing-Shanghai high-speed railway as an example, a simulation model of the type II slab ballastless track considering the contact characteristics between the upper layers of the track was established. On this basis, through research the influence of different cosine settlement parameters and the parameters of the track structure layer on the orbit, analyze the deformation and static properties of various structural layers of track under specific settlement conditions. Studies have shown that: based on the 20 m wavelength range, after the sedimentation amplitude reaches 10 mm, the interlayer contact performance of the track getting deteriorated, and the gap between the baseplate and the subgrade occurs, the stress of the baseplate increases the most, and the maximum compressive stress occurs at a magnitude of 40 mm; based on the 20 mm settlement amplitude, the base plate-subgrade gap disappears after the settlement wavelength is 30 m. The longitudinal stress of each structural layer of the track increases first and then decreases with the increase of wavelength, and the maximum stress occurs simultaneously at 30 m; the reduction of the thickness of the track slab and baseplate has a greater impact on the static structure of the track slab structure; the reduction of elastic modulus of concrete has great influence on the track deformation and static performance, but has little effect on interlayer contact performance.