Analysis of Frost Heave Laws in Subgrade on Haerbin-Dalian High-speed Railway and Its Influence Factors

After systematic analysis and comparison based on survey and statistic results of frost heave in the subgrade on Haerbin-Dalian High-speed Railway,this paper put forward the characteristics and basic laws of frost heave in subgrade of ballastless track in severe cold region.And by analyzing the influence factors of frost heave in subgrade such as water,temperature and particle content,this paper put forward the design optimization scheme about frost heave prevention and reduction from the perspective of structure design.It is of important guiding significance for the frost heave treatment and design optimization of subgrade structure of ballastless track in severe cold regions.