Temperature distribution analysis of high-speed railway roadbed in seasonally frozen regions based on empirical model

2015 ◽  
Vol 114 ◽  
pp. 61-72 ◽  
Author(s):  
Yu-Zhi Zhang ◽  
Yan-Liang Du ◽  
Bao-Chen Sun
Keyword(s):  
Temperature Distribution ◽  
Empirical Model ◽  
High Speed ◽  
Distribution Analysis ◽  
High Speed Railway ◽  
Seasonally Frozen Regions

scholarly journals Experimental Study of the Temperature Distribution in CRTS-II Ballastless Tracks on a High-Speed Railway Bridge

2020 ◽  
Vol 10 (6) ◽  
pp. 1980 ◽  
Author(s):  
Lei Zhao ◽  
Ling-Yu Zhou ◽  
Guang-Chao Zhang ◽  
Tian-Yu Wei ◽  
Akim D. Mahunon ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Distribution ◽  
Temperature Gradient ◽  
High Speed ◽  
Railway Track ◽  
Vertical Temperature ◽  
High Speed Railway ◽  
Extreme High Temperature ◽  
Transverse Temperature ◽  
Temperature Test

To study the temperature distribution in the China Railway Track System Type II ballastless slab track on a high-speed railway (HSR) bridge, a 1:4 scaled specimen of a simply-supported concrete box girder bridge with a ballastless track was constructed in laboratory. Through a rapid, extreme high temperature test in winter and a conventional high temperature test in summer, the temperature distribution laws in the track on the HSR bridge were studied, and the vertical and transverse temperature distribution trend was suggested for the track. Firstly, the extreme high temperature test results showed that the vertical temperature and the vertical temperature difference distribution in the track on HSR bridge were all nonlinear with three stages. Secondly, the extreme high temperature test showed that the transverse temperature distribution in the track was of quadratic parabolic nonlinear form, and the transverse temperature gradient in the bottom base was significantly higher than that of the other layers of the track. Thirdly, the three-dimensional temperature distribution in the track on HSR bridge was a nonlinear, three-stage surface. Furthermore, similar regularities were also obtained in the conventional high temperature test, in which the temperature span ranges were different from those of the extreme high temperature test. In addition, the conventional high temperature test also showed that under the natural environment conditions, the internal temperature gradient in the track layers changed periodically (over a period of 24 h).

Analysis of High-Speed Railway Roadbed Settlement in Seasonally Frozen Regions

2012 ◽  
Vol 204-208 ◽  
pp. 1740-1743 ◽  
Author(s):  
Gang Qiang Shi ◽  
Yu Zhi Zhang ◽  
Shi Yun Zhao ◽  
Lu Xin Zhang ◽  
Bao Chen Sun
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
Deformation Analysis ◽  
Analysis Model ◽  
Element Analysis ◽  
High Speed Railway ◽  
Finite Element Analysis Model ◽  
Seasonally Frozen Regions ◽  
Passenger Dedicated Line

Relying on the roadbed in seasonally frozen region of Harbin-Dalian passenger dedicated line，a finite element analysis model was built to study the changing rules of roadbed settlement in construction and operation. The analog and actual results were in good consistence, the model is suitable for the roadbed deformation analysis of high-speed railway in seasonally frozen regions.

Numerical studies for the thermal regime of a high-speed railway tunnel considering piston action on seasonally frozen regions

2022 ◽  
pp. 1-19
Author(s):  
Haiqiang Jiang ◽  
Fujun Niu ◽  
Wangtao Jiang ◽  
Li Cheng ◽  
Yongdong Li ◽  
...  
Keyword(s):  
Temperature Distribution ◽  
Air Temperature ◽  
High Speed ◽  
Thermal Environment ◽  
Fluid Dynamic ◽  
Frost Damage ◽  
Railway Tunnel ◽  
High Speed Railway ◽  
The Cost ◽  
Northeast Of China

Abstract piston action describes the phenomenon that air at the train nose is pushed forward by the increased pressure and air at the train rear is drawn forward by the decreased pressure when a train passes through a tunnel. The changes of pressure can affect the thermal environment inside the tunnel, and further cause frost damage. In this paper, a fluid-thermal-solid coupled numerical model considering piston action is developed. A high-speed railway tunnel in the northeast of China is taken as an example to explore the temperature distribution laws with computational fluid dynamic (CFD). Afterwards, the effects of air temperature and train velocity on temperature distribution are analyzed. The results show that the piston action can enhance the heat transfer between cold air outside the tunnel and tunnel structure, and can cause more serious frost damage especially at the entrance and exit. The temperature distribution is characterized by three zones, including disturbed zones at two sides of tunnel and undisturbed zone at tunnel middle. The freezing length is closely related to air temperature and train velocity. And also, the lengths are different at vault and rail of tunnel portal, which indicates that the anti-freezing measure should be different at these positions considering the cost. This paper can provide some reference for determining the anti-freezing fortified length of tunnels in cold regions.

scholarly journals Statistical delay distribution analysis on high-speed railway trains

2019 ◽  
Vol 27 (3) ◽  
pp. 188-197 ◽  
Author(s):  
Yuxiang Yang ◽  
Ping Huang ◽  
Qiyuan Peng ◽  
Jie LI ◽  
Chao Wen
Keyword(s):  
High Speed ◽  
Distribution Analysis ◽  
High Speed Railway ◽  
Delay Distribution ◽  
Statistical Delay
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