Temperature Field Analysis of Slab Track-Subgrade Structure based on Local Meteorological Data

Predicting the temperature distribution of slab track becomes quite complex and even non-trivial due to the influence of atmospheric environment and ground condition. On the basis of thermodynamics principle, this study develops an analytical solution for predicting the transient evolution of vertical temperature distribution along the centerline of the slab track integrating with subgrade structure. Emphasis is placed on investigating the influence depth of soil temperature, leading to determination of a reasonable depth at which the bottom boundary conditions are applied for the analytical solution. To validate the proposed analytical solution, a three-dimensional numerical simulation is performed for calculating the temporal evolution of the track temperature distribution. Using the five days’ meteorological data of Chengdu in China to be the boundary conditions at external surfaces of a bi-block track structure, the evolution of temperature profile of the track-embankment whole structure is analyzed by means of the developed analytical solution and the 3D FE model. Finally, a comparison is made between the results obtained from the analytical and numerical prediction and field monitoring. Results show that only based on local meteorological data, the simple analytical solution is capable of accurately predicting the temperature field of the slab track over embankments despite of neglecting the effects of rails, fastenings, and sleepers. In addition, they demonstrate that there exists a transverse temperature gradient within the concrete slab and the supporting bed, which is essentially the same as the temperature gradient along the vertical direction. In consequence, the closer the locations towards the track edges, the lower the maximum positive temperature gradient in the vertical direction through these locations while the deeper the influence depth is.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AR055 Standing Committee on Rail Transit Infrastructure.
  • Corporate Authors:

    Transportation Research Board

    ,    
  • Authors:
    • Yang, Rongshan
    • Kang, Weixin
    • Hu, Meng
    • Liu, Xueyi
    • Li, Jiali
    • Cao, Shihao
  • Conference:
  • Date: 2019

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References;
  • Pagination: 18p

Subject/Index Terms

Filing Info

  • Accession Number: 01698287
  • Record Type: Publication
  • Report/Paper Numbers: 19-05274
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 7 2018 9:50AM