Track irregularity and mechanical characteristics analysis of CRTS I ballastless track under subgrade frost heaving

Harbin-Dalian high-speed railway is located in the northeast of China, part of which belongs to seasonal frozen area. In seasonal frozen area, the seasonal frost heaving and thaw settlement of subgrade will lead to local uneven subgrade frost heaving deformation, which will cause overarching deformation of track structure, even cause structural damage and track irregularity, and affect train safety directly. On the basis of full site investigation, taking CRTS I ballastless track in frost heaving area of Harbin-Dalian high-speed railway as research object, the spatial finite element model considering the interlayer contact characteristics was established using ANSYS finite element software. The transfer properties of track irregularity, interlayer separation characteristics and mechanical characteristics under frost heaving condition were analyzed. It provides an important reference for the design of ballastless track in cold and seasonal frozen area.