北京交通大学学报2017，Vol.41Issue(1)：7-13,7.DOI:10.11860/j.issn.1673-0291.2017.01.002
路基冻胀地区CRTSⅠ型板式无砟轨道结构变形与离缝特征分析
Deformation and seam characteristics analysis of CRTSⅠ slab ballastless track in subgrade frost heaving zone
摘要
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.关键词
无砟轨道/路基冻胀/有限元模型/层间离缝/粘结强度Key words
ballastless track/subgrade frost heaving/finite element model/inter layer seam/coherence strength分类
交通工程引用本文复制引用
蔡小培,梁延科,谭诗宇,沈宇鹏..路基冻胀地区CRTSⅠ型板式无砟轨道结构变形与离缝特征分析[J].北京交通大学学报,2017,41(1):7-13,7.基金项目
国家自然科学基金面上项目(51578053) （51578053）
北京市自然科学基金(L150003) （L150003）
中国铁路总公司科研试验(Z2013-038-4)National Natural Science Foundation of China(51578053) （Z2013-038-4）
Beijing Municipal Natural Science Foundation(L150003) （L150003）
Scientific Research Test of China Railway Corporation(Z2013-038-4) （Z2013-038-4）
