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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2020  >  20(5): 73-81
SU Miao, ZHU Qi-zhi, DAI Gong-lian, PENG Hui. Temperature deformation of CRTSⅡslab ballastless track considering interfacial initial bond defects[J]. Journal of Traffic and Transportation Engineering, 2020, 20(5): 73-81. doi: 10.19818/j.cnki.1671-1637.2020.05.005
Citation: SU Miao, ZHU Qi-zhi, DAI Gong-lian, PENG Hui. Temperature deformation of CRTSⅡslab ballastless track considering interfacial initial bond defects[J]. Journal of Traffic and Transportation Engineering, 2020, 20(5): 73-81. doi: 10.19818/j.cnki.1671-1637.2020.05.005
shu

Temperature deformation of CRTSⅡslab ballastless track considering interfacial initial bond defects

doi: 10.19818/j.cnki.1671-1637.2020.05.005
  • 1.

    School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114

  • 2.

    National-Local Joint Laboratory of Engineering Technology for Long-Term Performance Enhancement of Bridges in Southern District, Changsha University of Science and Technology, Changsha 410114, Hunan, China

  • 3.

    School of Civil Engineering, Central South University, Changsha 410075, Hunan, China

Funds:

National Natural Science Foundation of China 51808056

Open Fund of National-Local Joint Laboratory of Engineering Technology for Long-Term Performance Enhancement of Bridges in Southern District 18KB02

More Information
  • Author Bio:

    SU Miao(1989-), male, lecturer, PhD, sumiao@csust.edu.cn

  • Received Date: 2020-05-08
  • Publish Date: 2020-10-25
    Abstract
  • Aiming at the phenomenon that the temperature deformation of China railway track system(CRTS) Ⅱ slab ballastless track in Chinese high-speed railways increases with the interfacial initial bond defects, an detection experimental system for the interfacial porosity of slab ballastless track was established based on the charge coupled device(CCD) industrial camera and the computer image processing technology. The initial porosities of interface between the track slab and the cement asphalt(CA) mortar from three CRTS Ⅱ ballastless track specimens were detected. In the finite element model, the initial porosity was used to quantitatively characterize the interfacial bond states. Considering a certain amount of initial porosity at the interface, according to the test results of interface porosity and assuming these voids evenly distributing on the entire interface, the effects of interfacial initial bond defects on the temperature deformation of slab ballastless track were systematically analyzed. Research result shows that the average interfacial porosity of the three CRTS Ⅱ ballastless track slabs is 22.3%, and the bond state around the bonding interface is significantly worse than that at the central positions of track slab interface. Under the actions of positive and negative vertical temperature gradients, the CRTS Ⅱ ballastless track presents the temperature deformation modes of slab center arch and slab edges warp, respectively. Compared with the track slab without considering the interfacial initial porosity, the maximum temperature deformation of track slab increases by 7.8%-10.1% under the action of positive temperature gradient, and with the further increase of interfacial initial porosity, the maximum arch temperature deformation of track slab increases linearly. Under the action of negative temperature gradient, the increase of interfacial porosity has little effect on the temperature deformation of track slab. The interfacial initial porosity defects between the track slab and the CA mortar should be considered properly when analyzing the temperature deformation of CRTS Ⅱ slab ballastless track. The research results can provide references for analyzing the temperature deformation mechanism of CRTS Ⅱ track slab.

     

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