Abstract：Abstract: Research purposes: In order to obtain longitudinal distribution lawof rail temperature and characteristics I rail longitudinal displacement at the transitions for high - speed railway，a transition between bridge and tunnel in Hefei - Fuzhou railway line was taken as research object and the rail temperature and longitudinal deformation was monitored continuously，to provide the reference for the stability research of jointless track at t!ie transition section. Research conclusions ：( 1) Transition section of rail temperature will form in the range of 20 m around tunnel portal and local maximum temperature gradient will reach 6.9 E/m，which is far more than 1.55 E/m calculated according to the linear distribution of temperature gradient. (2) The rail longitudinal displacement at transition section varies obviously with the change of daily temperature difference. The maximum daily temperature difference is 34. 9 E and the maximum daily variation is 1. 6 mm. (3) At the transition section， the rail longitudinal displacement has the trend to increase cumulatively and linearly，the maximum accumulation is 2 mm. The cumulative deformation rate is 0. 016 9 mm/day after the line was open to traffic，which is faster t!ian 0. 0147 mm^day before the line was open to traffic. (4) Based on least - squares method，the distribution mode of rail temperature along the line in the area of transition section of rail temperature and the prediction model of rail daily temperature difference were established. The fitting accuracy is relatively high and the regression model is reliable. (5) The research results provide research foundation for rail temperature force and longitudinal creep at tlie transition between bridge and tunnd in baiastless track for high - speed railway.
曾志平,罗俊，魏炜,宋善义. 高速铁路桥隧过渡段钢轨温度和纵向变形试验[J]. 铁道工程学报, 2017, 34(1): 30-35.
ZENG Zhi - ping，LUO Jun，WEI Wei，SONG Shan -yi. Experiment on the Temperature and Longitudinal Deformation of Rail at the Transition Between Bridges and Tunnels for High - speed Railway. Journal of Railway Engineering Society, 2017, 34(1): 30-35.
2017, Vol. 34 
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