To investigate the influence of subgrade frost heaving deformation on track irregularity and structural stress

based on the ANSYS finite element analysis method and the research on the subgrade section of the frost heaving zone of the Harbin-Dalian high-speed railway

the spatial refinement finite element model of CRTS I type ballastless track was established by considering the characteristics of limit boss

gel resin

and interlayer contact. On this basis

effects of the locations of frost heaving deformation and different frost heaving wavelengths and amplitudes on the ballastless track structure were discussed

and the track irregularity

interface crack characteristics

and static performance were analyzed. Results show that under short-wave frost heave

indicators of irregularity

deformation

interface crack

and stress of the ballastless track structure increased with the decrease of the frost heaving wavelength and the increase of the frost heaving amplitude. When the frost heave occurred in the center of the baseplate

the stress on the track structure was the most affected

and when the frost heave occurred in the baseplate expansion joint

it had the greatest effect on the deformation and interface crack of the structure. Compared with the track slab

the baseplate bore the largest tensile stress

and the structural stress was more affected when the frost heave occurred in the center of the baseplate. In terms of the tensile strength of the ballastless track

the baseplate was the limited structure

and the frost heaving limiting values ware recommended to be 10 m for wavelength and 5 mm for amplitude.