The Influence Rules Of Subgrade Frost Heave To Crts ? Slab Track On High-speed Railway

Subgrade frost heave is by far the most serious disease as to CRTS?slab track in seasonal frozen area during the construction and operation of high-speed railway.The sensibility of CRTS?slab track to subgrade deformation is embodied in two aspects,on the one hand,subgrade deformation will lead to track irregularity and then influence the safety and comfort,on the other hand,void may occur between slab,concrete roadbed and subgrade which will change the transmission of load and then destroy the track structure,shorten the service life and increase the maintenance cost.Based on above reasons,it is extremely important to study the influences of subgrade frost heave to CRTS?slab track.The simulation models for CRTS?slab track are established in this paper by the mean of finite element software ABAQUS.Composite beam model,beam-plate model,beam-solid model and extended finite element model are adopted to judge the applicability in the situation of subgrade frost heave.The most suitable model will be used to researsh the most unfavorable position of subgrade frost heave.Based on the most suitable model and the most unfavorable frost heave position,it is convenient to study the deformation transmission relationship and void of subgrade frost heave to track structure.In the end,the rail deformation will be imported to the Multi-body dynamics simulation model UM as the track irregularity to calculate the influence of the subgrade frost heave to train dynamic response.The results show that the beam-plate model can be better to simulate the subgrade frost heave in CRTS?slab track,and the according to the void height we can figure out the most unfavorable position for frost heave of different wavelengths.Finally,combining the limits of track structure void and train dynamic response,subgrade frost heave management values are obtained for CRTS?slab track of different speed lines.