Experimental Investigation into Longitudinal Temperature Field of CRTS I Ballastless Track in Bridge-Tunnel Transition Section

被引：0
|
作者：
Dai G.-L. [1 ,2 ]
Yue Z. [1 ]
Su H.-T. [1 ]
Zhu J.-P. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha, 410075, Hunan
[2] National Engineering Laboratory for High Speed Railway Construction, Changsha, 410075, Hunan
来源：
Su, Hai-Ting (suhaiting1988@gmail.com) | 1600年 / South China University of Technology卷 / 45期
关键词：
Bridge-tunnel transition section; Central mountainous area; Experimental investigation; Temperature field; Track structure;
D O I：
10.3969/j.issn.1000-565X.2017.06.010
中图分类号：
学科分类号：
摘要：
According to the continuous observation of longitudinal temperature distribution of ballastless tracks and roadbed slabs in the high-speed railway bridge-tunnel transition section in China's central complex mountainous area, the corresponding temperature distribution laws were obtained, and a suitable spring longitudinal temperature gradient load model was established.Analytical results show that (1) from the outside to the inside of the tunnel, the temperature variation amplitude of the rail gradually decreases, and the temperature peak time of 75 meters inside the tunnel lag for 4h than that of 22 meters outside the tunnel; (2) the longitudinal temperature of the rail increases with the increase of the tunnel's diameter and the maximum position range locates at 0~8m; when the tunnel depth is more than 75m, the temperature variation amplitude of the rail obviously becomes small and remains stable at 0.2℃; (3) the longitudinal temperature of the roadbed slab increases with the increase of the tunnel's diameter and the maximum position range locates at 0~8m; when the tunnel depth is more than 25m, the temperature variation amplitude of the slab obviously becomes small and remains stable at 1.7℃; (4) the maximum longitudinal temperature variation amplitudes of both the rail and the slab in a day appear in the duration of 14: 00~16: 00; and (5) the longitudinal temperature gradient mode can be divided into two types: one is the rail type and the other the slab type, and the longitudinal temperature gradients of both the rail and the slab can be fitted by the piecewise function. © 2017, Editorial Department, Journal of South China University of Technology. All right reserved.
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页码：59 / 65
页数：6
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