In order to find out the temperature effect of CRTS Ⅱ slab ballastless track in low temperature environment,a scale model of 1∶4 ballastless track-simply supported box girder structure was made,and the temperature distribution of track structure was analyzed by carrying out temperature load test in low temperature environment,structural stress and time-history variation of longitudinal displacement.The test results show that the CA mortar layer has a retarding effect on the vertical transfer of temperature,the most unfavorable tempera-ture structure appears at the interface between the track slab and the CA mortar layer,and the overall temperature distribution is"hoe-shaped".The intermediate stress values in the longitudinal direction are all greater than two.The vertical displacement and longitudi-nal displacement of the track structure have obvious linear relationship with the temperature.Finally,it is pointed out that the CRTS Ⅱ slab ballastless track has poor low temperature adaptability,and the use of this structure type should be minimized in severe cold areas.
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