High-speed railways are widely distributed in permafrost regions of China,and the impact of frozen subgrade on the structural damage of slab track of high-speed railways is more obvious,which endangers the safety of train operation.However,the control limits of frost heave of subgrade have not yet been established for the CRTS Ⅲ slab track.In this paper,based on the vehicle-track coupling dynamic theory and concrete plastic damage theory,considering the concrete structure damage and vehicle-rail interaction,a vehicle-ballastless track-frozen subgrade static and dynamic analysis model was established,and the impacts of subgrade frost heaving on the damage of CRTS Ⅲ slab track and vehicle dynamic performance indexes were analyzed.Integrating the static and dynamic control indexes,a classified control limit was put forward for the deformation of the frost heaving.Considering the interlayer seam and structural damage of rail structure,vertical displacement of rail,passenger comfort and operation safety and other control indexes,the frost heave limit of subgrade was divided into 5 zones.The results show that when the freezing expansion of the subgrade acts in the middle of the track plate,extreme values of damage and seam appear.The structural damage and vehicle dynamic response show an increasing trend with the decrease of the wavelength and the increase of the depth of the wave,and they are all more sensitive to the influence of the wavelength.It can ensure the safety of vehicle operation according to the frost heave limit of different zones and provides guidance for the maintenance and repair of slab track in permafrost areas.
维普
万方数据