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Study on insulation measures of high-speed railway subgrade in seasonally frozen soil region

L Fei;The Third Railway Survey and Design Institute Group Corporation;  
In order to reduce the influence of embankment frost heaving on high-speed railway unballasted track smoothness in seasonal frozen soil regions,a laboratory model test was conducted using embankment insulation measure.Different thicknesses of insulation boards were covered by fillers of Groups A and B,and tested under freeze-thaw cycles,then deformation and temperature of the fillers were measured and analyzed.The laboratory model test results indicated that the thermal insulation effect of XPS insulation board was excellent,and the thicker the board,the better the effect.The insulation measure not only can decrease the frost heaving deformation of the filler in Ha-Qi railway passenger dedicated line effectively,but also can reduce the residual deformation.According to the laboratory test results,using heat preservation measure with 20-cm thickness insulation board,a field test was carried out in an embankment section of Ha-Qi Railway passenger dedicated line.The test results show that the heat preservation measure would be able to effectively control the frost heaving deformation in the track plate region of the left and right lines,which would guarantee the railway surface smoothness.
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