Analysis of Frost-heaving of Filling Materials Group A and Group B for Subgrade of Passenger Dedicated Line

Research purposes: Based on the frost-heaving mechanism and influence factors on the frozen soil subgrade and according to the filling materials for the bubgrade in the section,this paper discusses whether the frost-heaving of the frozen soil subgrade can be effectively controlled or not by using the 60cm thick filling material with fine grain content less than 15% except the requirements of frost-heaving for the subgrade bottom base can be met by using the crashed-stone soil with fine grain content less than 5%.Research conclusions:Based on the analysis of frost-heaving mechanism of the subgrade and its influence factors,and tests to the frost-heaving of filling materials Group A and Group B,the discussion is made on the frost-heaving of the fixed filling materials and it is concluded the frost-heaving of the subgrade base can be effectively controlled by using the 60cm thick crashed-stone filling material with fine grain content less than 15%.However,as the influence factors on the frost-heaving are complicated and the research results have limitations,it is necessary to do the further study on remedying and improving the frost-heaving data to make the design of antifreeze filling material and structure more reasonable for the subgrade.