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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2019  >  19(2): 82-91
REN Juan-juan, YAN Ya-fei, HU Hua-feng, DENG Shi-jie, FENG Xiang. Analysis method on time-history characteristics of rail supporting force for mixed passenger and freight railway with ballastless track[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 82-91. doi: 10.19818/j.cnki.1671-1637.2019.02.008
Citation: REN Juan-juan, YAN Ya-fei, HU Hua-feng, DENG Shi-jie, FENG Xiang. Analysis method on time-history characteristics of rail supporting force for mixed passenger and freight railway with ballastless track[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 82-91. doi: 10.19818/j.cnki.1671-1637.2019.02.008
shu

Analysis method on time-history characteristics of rail supporting force for mixed passenger and freight railway with ballastless track

doi: 10.19818/j.cnki.1671-1637.2019.02.008
  • 1.

    Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 3.

    Science and Technology Management Department China Railway, Beijing 100844, China

More Information
  • Author Bio:

    REN Juan-juan (1983-), female, professor, PhD, jj.ren@home.swjtu.edu.cn

  • Received Date: 2018-10-10
  • Publish Date: 2019-04-25
    Abstract
  • The rail supporting force for mixed passenger and freight railway with ballastless track in the Suining to Chongqing Railway was tested on site by the Tekscan pressure measurement system. A Gaussian function type time-history expression of rail supporting force was proposed and verified by the field test data. According to the time-history expression of rail supporting force, the loads were applied to the track structure model through the sequential loading method, and the dynamic response results were compared with those obtained from the vehicle-track-subgrade vertical coupling vibration model and the field test. Research result shows that the maximum field measured rail supporting forces of passenger and freight train are 29.91 and 82.49 kN, respectively. The relative differences are less than 20% in comparison with the test result obtained by the China Academy of Railway Sciences. Therefore, the Tekscan pressure measurement system can accurately measure the rail supporting force. For the passenger and freight train, the correlation coefficients of rail supporting force time-history curves fitted by the Gaussian function and the field measured curves are 0.962 7 and 0.966 7, respectively. The relative differences between the fitted maximum rail supporting forces and the field measured values are 5.15% and 0.46%, respectively, and the relative differences between the fitted minimum rail supporting forces and the field measured values are 7.23% and 24.11%, respectively. Therefore, the Gaussian function can well simulate the time-history curves of rail supporting force under the actions of passenger and freight trains, and the simulation accuracy to freight train is slightly higher than to passenger train. Compared with the results of vehicle-track-subgrade vertical coupling vibration model and field test, the relative differences of the maximum displacements of track slab obtained from the load excitation-track-subgrade model based on the sequential loading method are 5.41% and 2.70%, respectively, the relative differences of the maximum displacements of base plate are 2.86% and 5.71%, respectively, the relative differences of the maximum acceleration of track slab are 14.00% and 23.20%, respectively, and the relative differences of the maximum accelerations of base plate are 13.61% and 8.73%, respectively. Therefore, the load excitation-track-subgrade model based on the sequential loading method and the Gaussian function type time-history expression of rail supporting force is reliable. This method does not need to establish the car body model, and not only ensure the calculation efficiency, but also have a very high accuracy.

     

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