Analysis Of Track Irregularity And Dynamic Response For The Influence Of High Speed Railway Subgrade Frost Heaving

The high-speed railway has come into a large-scale development in northeast of our country, with a mileage of more than2000km. The operation experience of Ha’erbin-Dalian High-speed Railway for a winter shows that, the frost heaving of high-speed railway subgrades in alpine region is the main causes of maintenance, meanwhile, affecting the comfort feature. In order to assuage the problem, a variety of subgrade structure and control methods have been taken by the operations, but not efficiently. Therefore, it has the vital significance to analysis how the frost heaving of subgrades impact the influence of track irregularity and the dynamic response, which can also provide a basis for formulating control standard.This paper focus on "high-speed railway track structure deformation-track geometric irregularity" transfer model, and set up the transfer model and dynamic model, which based on different wavelength and amount of frost heaving, by using finite element analysis software ABAQUS. In addition, find out the influence of traffic safety in different wavelength, frost heaving amount and speed while travelling the subgrades in alpine region, and give some suggestions. Finally, verify the conclusion in this paper by the measure data in the field.The research shows that, when the frost heaving wavelength is small, there’s less impact on track irregularity, train safety and stability which caused by the subgrade, but it can also lead to voids between the concrete roadbed and the subgrade surface, and cause damage to the track structure while the train travel in a high speed. On the other hand, when the frost heaving wavelength is large, the track structure sheaves follow well, but there’s greater impact on track irregularity, which is a threat to the train safety and stability. In such case, the speed of the train need to be control.