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| Research on the Progress of Railway Subgrade Frost Heave in Seasonal Frozen Region |
| CAO Yuan – bing |
| (TheThird Railway Survey and Design Institute Group Corporation，Tianjin 300251，China) |
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Abstract Abstract ： Research purposes ： Frost heave is one of the dificulties to control deformation of high - speed railway subgrade in deep seasonally frozen region. High speed railway subgrade needs extremely tiny deformation，which frost heave greatly increased the difficulty to control，especially ballastless track. In view of the necessity and urgency of deeper study on railway subgrade frost heaving，we analyzed and summarized the progress in research on frost heave of railway subgrade in seasonal frozen region ( SFR) in this paper. Research conclusions：First of all，summarized metliods to control frost heave of railway subgrade in SFR： in Germany， France and Japan， on - frost heaving fillers are used within the scope of the frozen depth， which is calculated with freezing index， while we calculate with standard frost depth. Secondly， introduced the mechanism of frost heave including moisture migration and ice formation， the three elements of which happened ( negative temperature， fine grained soils and water)， and summarized the progress of three research directions to control frost heave ： heat preservation，filler improvement and water control. Finally，the next research direction is prospected: strengthen the field monitoring and simulation analysis. This research result can provide reference and summary of subgrade frost heaving for the further research.
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Received: 02 March 2017
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2017, Vol. 34 
