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Home > Archive>Volume 49, Issue 3, 2021 >400-410. DOI:10.11908/j.issn.0253-374x.20309
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Warping Features of Ballastless Track-Slab Under Debonding-Repaired Condition
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1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education， Tongji University， Shanghai 201804， China;2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety， Tongji University， Shanghai 201804， China;3.Shanghai Tunnel Engineering and Rail Transit Design and Research Institute， Shanghai 200235， China;4.China Railway Shanghai Group Co.， Ltd.， Shanghai 200071， China

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U216

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    Abstract:

    Based on the construction technology of the debonding repairment applied to the high speed railway ballastless track， the interlayer interfaces were simulated by adapting cohesive element based on the bilinear cohesive zone model， and a finite element model of II slab track of China railway track system （CRTS） was established with full consideration of multi-interface bonding properties. The warping features of the ballastless track-slab were calculated and analyzed at the temperature gradient loads from -50 ℃·m-1 to ＋100 ℃·m-1 and the temperature change loads from －30 ℃ to 30 ℃， respectively. The results show that within the range of the temperature loads in this paper， under the debonding-repaired condition， the warping modes and the warping extremes of the track-slab are consistent with the normal state， which indicates that the debonding repairment has restored the warping of the track-slab.

    Table 1
    Fig.1 Effect of debonding repairment in CRTS II slab ballastless track (Source: http://www.hbmzj.com)
    Fig.2 Stress-displacement constitutive relationship of bilinear cohesive zone model
    Fig.3 Finite element model of debonding repaired CRTS II slab ballastless track
    Fig.4 Data of measured temperature gradient of CRTS II ballastless track[15]
    Fig.5 Data of measured temperature rise and drop of CRTS II ballastless track[15]
    Fig.6 Definition of direction of track-slab and extraction position of displacement curve
    Fig.7 Distribution of vertical displacement of track-slab under positive temperature gradient load
    Fig.8 Comparison of vertical displacement of track-slab under positive temperature gradient load
    Fig.9 Distribution of vertical displacement of track-slab under negative temperature gradient load
    Fig.10 Comparison of vertical displacement of track-slab under negative temperature gradient load
    Fig.11 Distribution of vertical displacement of track-slab under temperature rise load
    Fig.12 Comparison of vertical displacement of track-slab under temperature rise load
    Fig.13 Distribution of vertical displacement of track-slab under temperature drop load
    Fig.14 Comparison of vertical displacement of track-slab under temperature drop load
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XU Yude, MIAO Wenying, YAN Daobin, ZHU Wenjun, XU Weichang. Warping Features of Ballastless Track-Slab Under Debonding-Repaired Condition[J].同济大学学报(自然科学版),2021,49(3):400~410

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History
  • Received:August 02,2020
  • Online: April 06,2021
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