Vertical nonlinear temperature distribution and temperature mode of unballasted track in typical areas of China

被引：0
|
作者：
Yan B. [1 ,2 ]
Liu S. [1 ]
Dai G. [1 ,2 ]
Pu H. [1 ,2 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
[2] National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha
来源：
Pu, Hao (haopu@csu.edu.cn) | 1600年 / Science Press卷 / 38期
关键词：
Regularities of distribution; Temperature gradient; Thermodynamic analysis; Track engineering; Unballasted track;
D O I：
10.3969/j.issn.1001-8360.2016.08.012
中图分类号：
学科分类号：
摘要：
During the heat exchange with external environment, there is a vertical nonlinear temperature gradient in unballasted track structure. The vertical temperature gradient not only affects the stability of continuous track structure, but also causes warpage of track plate, resulting in debonding of mortar layer from the joint. Based on the finite element software ANSYS, considering the influence of the latitude and longitude of the track and local climate, the heat exchange effects were transformed into heat flux boundary conditions and applied to the thermodynamic analysis model of unballasted track temperature field. In addition, the accuracy of the calculation method was validated by the measured data. On this basis, the vertical temperature gradient distribution of unballasted track under different geographical coordinates and climatic conditions was studied and the vertical temperature load mode for unballasted track applicable to typical regions in China was explored, through addition of the regional adjustment coefficients. Studies have shown that unballasted track surface temperature changed greatly with the environmental temperature while its internal temperature change showed a certain time lag and the amplitude of variation weakened fast with increase of the depth. The maximum positive temperature gradient of unballasted track throughout the country occurs at 13: 30~16: 00 from May to August, with maximum vertical average positive temperature difference of unballasted track being 17.0℃, while the maximum negative temperature gradient occurs at 5: 00~5: 30 in January, with average negative temperature difference being 8.7℃. © 2016, Editorial Office of Journal of the China Railway Society. All right reserved.
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页码：81 / 86
页数：5
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