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XIANG Jun, LIN Shi-cai, YU Cui-ying, YUAN Cheng, SU Wei. Transfer rules and effect of stress and deformation of ballastless track under uneven subgrade settlement[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 69-81. doi: 10.19818/j.cnki.1671-1637.2019.02.007
Citation: XIANG Jun, LIN Shi-cai, YU Cui-ying, YUAN Cheng, SU Wei. Transfer rules and effect of stress and deformation of ballastless track under uneven subgrade settlement[J]. Journal of Traffic and Transportation Engineering, 2019, 19(2): 69-81. doi: 10.19818/j.cnki.1671-1637.2019.02.007
shu

Transfer rules and effect of stress and deformation of ballastless track under uneven subgrade settlement

doi: 10.19818/j.cnki.1671-1637.2019.02.007
  • 1.

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

  • 2.

    School of Science, East China Jiaotong University, Nanchang 330013, Jiangxi, China

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  • Author Bio:

    XIANG Jun (1968-), male, professor, PhD, jxiang@mail.csu.edu.cn

  • Received Date: 2018-10-23
  • Publish Date: 2019-04-25
    Abstract
  • The finite element models were established base on the characteristics of CRTS Ⅰ and CRTS Ⅱ slab ballastless track structures on the subgrade. The transfer laws of stress and deformation of different slab ballastless tracks and their effects were analyzed under the role of uneven subgrade settlement. Analysis result indicates that the vertical deformation of the upper track structure deforms accordingly with the subgrade after uneven subgrade settlement occurs. The deformation and settlement curves are similar but not completely coincident. The expansion joints that exist in the base plate have great influence on the stress and deformation of track structure. Under the condition of 20 mm/20 m, the vertical displacements of CRTS Ⅰ and CRTS Ⅱ slabs reach 90% and 60% of settlement amplitude, respectively, the vertical displacement of CRTS Ⅱ slab is less affected by the settlement compared with CRTS Ⅰ slab, but the latter is more likely to form a larger range of seam, and the length of the seam is 6.52 m and 1.92 times the length of the seam of CRTS Ⅰ slab. When the settlement amplitude is located at the center of base plate, the seams are mainly concentrated at the expansion joint, settlement end and settlement center. But when the settlement amplitude is located at the expansion joint, the seams are mainly concentrated on both sides of the expansion joint and settlement end. With the change of settlement wavelength or amplitude, it will cause the maximum position of seam to shift. Under the role of uneven subgrade settlement, the longitudinal maximum tensile stress of the base plate of CRTS Ⅰ slab is greater than that of slab, while the CRTS Ⅱ slab is opposite. Considering the strength of concrete, the settlement control standard of CRTS Ⅰ slab should be based on the tensile stress of base plate, while the settlement control standard of CRTS Ⅱ slab should be based on the tensile stresses of slab and base plate comprehensively.

     

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