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Volume 54 Issue 6
Nov.  2019
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Article Contents
Journal of Southwest Jiaotong University  > 2019  >  54(6): 1196-1202.
CHEN Xianhua, MA Lili, YANG Guotao, CAI Degou. Temperature Field Characteristics of High-Speed Railway Subgrade Surface with Asphalt Concrete Layer in Cold Regions[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1196-1202. doi: 10.3969/j.issn.0258-2724.20170490
Citation: CHEN Xianhua, MA Lili, YANG Guotao, CAI Degou. Temperature Field Characteristics of High-Speed Railway Subgrade Surface with Asphalt Concrete Layer in Cold Regions[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1196-1202. doi: 10.3969/j.issn.0258-2724.20170490
shu

Temperature Field Characteristics of High-Speed Railway Subgrade Surface with Asphalt Concrete Layer in Cold Regions

doi: 10.3969/j.issn.0258-2724.20170490
  • Received Date: 20 Jun 2017
  • Rev Recd Date: 18 Jul 2018
    • Available Online: 11 Jan 2019
  • Publish Date: 01 Dec 2019
    Abstract
  • In order to gain better insight on the temperature field characteristics of the subgrade surface with asphalt concrete layer in cold regions, the transient thermal finite element analysis is adopted to study the temperature field spatial-temporal distribution of ballastless tracks in cold regions and the influence of asphalt concrete layer. Firstly, numerical models based on the CRTS system (ballastless track) of Haerbin-Qiqihaer passenger line were developed. The numerical model was then verified with the field test results. Finally, the temperature field characteristics of the subgrade surface with asphalt concrete layer and the time-varying law of the temperature characteristics for typical cross sections and typical points in the ballastless tracks are evaluated through comparison.. The results show that the temperature field of track slab system in cold regions have a non-uniform distribution and show a double U-shaped distribution horizontally. The temperature gradient is non-linear, and the averaged monthly temperature gradient alternate between positive and negative. The subgrade depth, of which the temperature is affected by the ballastless track structure in northeastern China, can reach 0.4 m in a day, 2.5 m in a month and about 4.0 m in a year. It is concluded that the thin asphalt concrete layer over the subgrade surface has the function of heat preservation and prompts 1−7 ℃ increase in the daily average temperature of subgrade surface whereas it makes no significant change to the temperature field distribution of the ballastless track subgrade in cold regions.

     

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