中国铁道科学2013，Vol.34Issue(4)：1-7,7.DOI:10.3969/j.issn.1001-4632.2013.04.01
CRTS Ⅱ型板式无砟轨道结构层间早期离缝研究
Analysis of Early Gap between Layers of CRTS Ⅱ Slab Ballastless Track Structure
摘要
Abstract
Slab temperature gradient is obtained by observing the temperature field of slab under which CA mortar is grouting in different climate conditions.The warping deformation and stress of track structure under the action of measured temperature gradient is analyzed by building its mechanical calculation model.The results show that air temperature and solar radiation are the main influence factors on temperature gradient.Slab surface temperature plays the control effect on temperature gradient on which the hydration heat of CA mortar has some effects.The alternative variations of the warping compressive and tensile stress which can easily lead to the emergence of early gap between layers of track structure are caused by daily alternative variations of the positive and negative temperature gradient.There are two effective ways to reduce the early gap between the layers of track structure.Firstly,using effective heat insulation measures to control the slab surface temperature so that the early temperature field can be controlled to avoid large temperature warping stress which is due to large temperature gradient of slab.Secondly,prolonging as possible the demolish time for compaction device and fine adjustment jack according to strength increasing law of CA mortar.关键词
无砟轨道/轨道板/CA砂浆/离缝/温度场/温度梯度/温度翘曲变形Key words
Ballastless track/ Track slab/ CA mortar/ Gap/ Temperature field/ Temperature gradient/Temperature warping分类
交通工程引用本文复制引用
刘钰,赵国堂..CRTS Ⅱ型板式无砟轨道结构层间早期离缝研究[J].中国铁道科学,2013,34(4):1-7,7.基金项目
国家自然科学基金青年基金资助项目(51008258) （51008258）
