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| Research on the Temperature Field Characteristic of CRTS II Slab Ballastless Track |
| WU Bin，LIU Can，ZENG Zhi - ping，WEI Wei |
| (Central South University，Changslia，Hunan 410075，China) |
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Abstract Research purposes: In order to get the temperature distribution and variation rules of CRTS I slab ballastless track，it took the Shanghai - Kunming High Speed Railway CRTS I slab baiastless track as research object，and each structural layer temperature was continuously tested by arranged sensors along the track structure in the depth direction. Research conclusions：( 1) The track structure temperature changes with a daily cycle back and forth. (2) In the test period，the highest temperature of the top surface of track plate was above 10F than air temperature，and the maximum positive and negative temperature gradient was 48. 0F/m and - 33. 6F/m. (3) With increasing depth of track structure，the fluctuations of the top surface temperature and temperature gradient gradually attenuated and the phase difference of those increased，and the mutation appeared on the temperature curve in CA mortar layer，for another the base plate temperature gradient changed slightly. (4) The temperature field load mode of vertically slab track was established under high temperature conditions by the regression analysis of temperature and temperature gradient，which was based on least squares method，and the prediction model of track plate maximum temperature gradient built upon the correspondingtop surface temperature， in addition the accuracy of prediction models was high with the correlation coefficient varying from 0. 82 to 0. 93. (5) The research results can provide references for selection of CRTS I slab ballastless track temperature load mode.
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Received: 12 October 2015
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2016, Vol. 33 
