Volume 23 Issue 3
Jun.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(3): 103-113
LI Yang, CHEN Jin-jie, WANG Jian-xi, SHI Xian-feng, CAI Jia-sheng. Effects of glue injection and reinforcement anchor installation on mechanical deformation of longitudinally connected slab-type ballastless tracks[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 103-113. doi: 10.19818/j.cnki.1671-1637.2023.03.007
Citation: LI Yang, CHEN Jin-jie, WANG Jian-xi, SHI Xian-feng, CAI Jia-sheng. Effects of glue injection and reinforcement anchor installation on mechanical deformation of longitudinally connected slab-type ballastless tracks[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 103-113. doi: 10.19818/j.cnki.1671-1637.2023.03.007
shu

Effects of glue injection and reinforcement anchor installation on mechanical deformation of longitudinally connected slab-type ballastless tracks

doi: 10.19818/j.cnki.1671-1637.2023.03.007
  • 1.

    State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China

  • 2.

    Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China

  • 3.

    Hebei Key Laboratory of Geotechnical Engineering Safety and Deformation Control, Hebei University of Water Resources and Electric Engineering, Cangzhou 061001, Hebei, China

Funds:

National Key Research and Development Program of China 2021YFB2601000

Central Leading Local Science and Technology Development Fund Project of China 216Z3901G

Natural Science Foundation of Hebei Province E2021210142

Natural Science Foundation of Hebei Province E2022210086

More Information
  • Author Bio:

    LI Yang(1991-), male, assistant professor, PhD, lyang1@stdu.edu.cn

    CHEN Jin-jie(1963-), male, professor, PhD, cjjwxq@126.com

  • Received Date: 2022-12-09
    Available Online: 2023-07-07
  • Publish Date: 2023-06-25
    Abstract
  • For the mechanical deformation of longitudinally connected slab-type ballastless tracks under high-temperature load after maintenance measures were taken, the nonlinear constitutive relationship of bond stress-displacement at interfaces between track slabs and mortar layers and the nonlinear constitutive relationship of stress-slip in reinforcement anchor structure were considered, a finite element model for mechanical behavior analysis of longitudinally connected slab-type ballastless tracks was built, the nonlinear high-temperature load was applied to the model, and the influence laws of glue injection, reinforcement anchor installation, and 2 measures jointly used on the mechanical deformation and structural damage were compared and analyzed. Analysis results show that for the basic working condition with a 0.2 m interface seam on both sides of the track slab and a damaged wide and narrow joint, under the maintenance measures of glue injection, reinforcement anchor installation, and 2 measures jointly used, the maximum values of the interface seam at the end of the track slab adjacent to the damaged joint are 63%, 20%, and 18% of those before taking maintenance measures, and the maximum values of the compression damage of the damaged joint concrete are 51.0%, 6.8%, and 5.5% of those before taking maintenance measures. For the longitudinally connected slab-type ballastless track with a poor structural state of wide and narrow joints, the maintenance effect of reinforcement anchor installation is much better than that of glue injection, and the effect of using the two measures jointly is better. The effects of glue injection on limiting the vertical displacement at the end of longitudinally connected slab-type ballastless tracks, interface damage, and compression damage of wide and narrow joints increase with the increasing depth of glue injection. When only glue injection is taken, in order to reach the amplitude range of interface damage at the end of the track slab adjacent to the damaged joint when 2 measures are jointly used, the number of glue injection slabs shall not be less than 2, and the depth of glue injection on both sides shall not be less than 0.9 m. It is recommended to fully ensure the glue injection maintenance area when the glue injection is taken only.

     

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