• ISSN 0258-2724
  • CN 51-1277/U
  • EI Compendex
  • Scopus
  • Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
  • Chinese S&T Journal Citation Reports
  • Chinese Science Citation Database
Volume 58 Issue 2
Apr.  2023
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Article Contents
XIE Hongwei, LUO Qiang, JIANG Liangwei, ZHANG Liang, WANG Tengfei, LIU Gang. Analysis on Load Dynamic Stress Characteristics of Embedded Track Subgrade of Tram[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 479-488. doi: 10.3969/j.issn.0258-2724.20210303
Citation: XIE Hongwei, LUO Qiang, JIANG Liangwei, ZHANG Liang, WANG Tengfei, LIU Gang. Analysis on Load Dynamic Stress Characteristics of Embedded Track Subgrade of Tram[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 479-488. doi: 10.3969/j.issn.0258-2724.20210303

Analysis on Load Dynamic Stress Characteristics of Embedded Track Subgrade of Tram

doi: 10.3969/j.issn.0258-2724.20210303
  • Received Date: 05 May 2021
  • Rev Recd Date: 26 Aug 2021
  • Available Online: 10 Dec 2022
  • Publish Date: 13 Jul 2022
  • Determining the dynamic response characteristics of a subgrade under tram traffic loads is a key technical prerequisite for the design of embedded rail roadbed structures. First, a tram-embedded track-soil subgrade coupling dynamics model is established by considering the articulation forms between the car bodies, track support conditions, and damping effect of the subgrade. Then, dynamics simulations are performed using the track irregularity PSD of the China railway (CR) as excitation. Finally, the vehicle load characteristics on the subgrade surface are analyzed and the probability distribution characteristics of the dynamic stress amplification factor and its decay law with depth are discussed. The results show that the dynamic stress amplitude on the embedded track subgrade surface is subject to a normal distribution resulting from random track irregularities. Under the conditions of a tram with an 11 t axle, a design speed of 100 km/h, and a 90% CR track spectrum, the dynamic stress amplification factor on the subgrade surface obeys a normal distribution N (1.008, 0.1002), the frequent dynamic factor with a 30% exceedance probability is 1.058, and the limit dynamic factor with a 99.9% guarantee rate is 1.308. Influenced by the damping of the subgrade material, the dynamic stress amplification factor decays linearly with depth, and when the damping increases, the decay trend accelerates. With increasing depth, the mean dynamic stress amplification factor gradually decreases, from the dynamic action increasing zone slightly greater than 1, and to the dynamic action weakening zone less than 1.

     

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