Deformation and seam characteristics analysis of CRTSⅠ slab ballastless track in subgrade frost heaving zone
CAI Xiaopei
LIANG Yanke
TAN Shiyu
SHEN Yupeng
Abstract：In order to reveal the effects of subgrade frost heaving deformation on riding comfort of high-speed railway ballastless track in severe cold area,a spatial coupling finite element model for a CRTS Ⅰ ballastless track-subgrade system was established.Based on the model,the deformation characteristics of track structure under different frost heaving conditions were analyzed.Besides,the developing process of interlayer seam was studied,the influences of coherence strength between layers,and bed plate stiffness on the development of layer seam were explored.The results show that frost heaving position has a big effect on track structure deformation,and the frost heaving deformation can reflect to rail surface.The maximum value of seam between bed plate and bedding surface occurs when frost heaving acts on the middle of track plate.The maximum value of the seam increases linearly with the increase of frost heaving amount,and it decreases with the increase of frost heaving wavelength.The seam extends from the middle to both sides in the transverse direction of trade structure.Both the value and the length of seam diminish as the coherence strength between bed plate and bedding surface increases.The value of seam decreases with the decrease of bed plate stiffness.Specifically,the value of seam decreases by 20％ when bed plate stiffness is 60％ of the initial.
Keywords：ballastless tracksubgrade frost heavingfinite element modelinter layer seamcoherence strength
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 7-13 )