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Journal of Zhejiang University-SCIENCE A

, Volume 19, Issue 12, pp 939–950 | Cite as

Effects of initial up-warp deformation on the stability of the CRTS II slab track at high temperatures

  • Zui Chen
  • Jie-ling XiaoEmail author
  • Xiao-kai Liu
  • Xue-yi Liu
  • Rong-shan Yang
  • Juan-juan Ren
Article
  • 20 Downloads

Abstract

Initial up-warp deformation is one of the key factors that affect the stability of the China Railway Track System type II (CRTS II) slab track. Through modeling analysis, we studied the effects of different initial up-warp conditions on the deformation and stability of a slab track at high temperatures. Based on the theory of ‘variable span length’ in continuous welded rail (CWR), a vertical stability analysis model of the CRTS II slab track was established using the finite element method (FEM), and a scale model test was conducted. The effects of initial up-warp deformation features, such as rise displacement, span length, and line type on the stability of track slabs at high temperatures were studied through simulation. Results showed that the trends of vertical displacement were almost the same based on the FEM, analytical method, and on-site testing, but there was a better agreement between results from the FEM and the analytical method. When the span length was 6.5 m and the rise displacement of the initial up-warp reached 15 mm, compressional destruction was most likely to occur on the concrete at the bottom of the apex. The rise-span ratio of the slab up-warp reached its maximum when the initial up-warp span was 6.5 m at high temperatures. It is easier for track slabs to maintain their original form at a high temperature when there is an angle at the apex or a smooth boundary. However, with a smooth boundary, the concrete at the bottom of the apex is more likely to suffer compressional destruction. Therefore, to ensure the stability of the CRTS II slab track, an initial up-warp with a span of 6.5 m and a rise of 15 mm should be avoided, and the effects of different line types of the initial up-warp also need to be considered.

Key words

High-speed railway China Railway Track System type II (CRTS II) slab track Initial up-warp High temperature Stability 

初拱变形对CRTSII型板式轨道高温稳定性影响研究

摘要

目的

初拱变形是影响CRTSII型板式轨道垂向稳定性的关键因素之一。通过建模分析,深入研究初拱变形的不同特征量,即矢度、弦长和线型,对其受力变形及高温稳定性的影响。

方法

基于变波长变形曲线建立CRTS II型板垂向稳定性分析理论,开展缩尺模型试验验证,并通过有限元法进行计算仿真。

结论

有限元法、解析法与现场试验所得垂向上拱位移的变化趋势一致,有限元法与解析法结果吻合更好。轨道板初拱弦长为6.5 m 且初拱矢度超过 15 mm 时,拱顶处下缘混凝土最易发生受压破坏。 在高温环境下,初拱弦长为6.5 m 的轨道板上拱 矢跨比最大。拱顶存在折角、初拱段边界平滑的轨道板在高温环境下更容易保持原有形态,但后者于拱顶处下缘的混凝土更容易发生受压破坏。 故为确保CRTS II 型板的稳定性,应避免弦长达 到6.5 m 且矢度超过15 mm 的初始上拱,另需关 注不同初拱线型对轨道板上拱的影响。

关键词

高速铁路 CRTS II型板式轨道 初拱变形 高温 稳定性 

CLC number

U213.2 

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Copyright information

© Zhejiang University and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.MOE Key Laboratory of High-speed Railway EngineeringSouthwest Jiaotong UniversityChengduChina
  2. 2.School of Civil EngineeringSouthwest Jiaotong UniversityChengduChina

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