铁道科学与工程学报2025，Vol.22Issue(8)：3339-3351,13.DOI:10.19713/j.cnki.43-1423/u.T20241808
高速铁路CRTSⅢ型板式无砟轨道伸缩缝变化研究
Study on the change of expansion joints of CRTSⅢ slab track for high-speed railway
摘要
Abstract
There are expansion joints between the longitudinal direction of the multi-layer composite structure of CRTⅢ slab track structure,and the expansion joints of the base plate are prone to leave the joints under the action of temperature load,affecting the waterproofing performance of the base plate and the substructure and adversely affecting the track structure.By carrying out on-site environmental temperature and displacement monitoring,we obtained the displacement and temperature measurement data of expansion joints within the annual cycle,and analysed the cyclic variation rule of expansion joints and temperature.Finite element software was used to establish a finite element simulation model of the ballast track structure and the seam layer at the location of expansion joints considering fine reinforcement design in order to analyse the deformation of the ballast track structure and the seam layer under extreme warming and cooling and to simulate and analyse the influence of different base plate unit lengths on the deformation of the structure and the seam layer.The results show that under the action of temperature loading,the change of expansion joints and the ambient temperature present a negative correlation,and the expansion joints keep increasing after the temperature decreases.The deformation of the expansion joint itself can reach 7.9 mm under the overall temperature rise and fall of 50℃,and it is easy to produce vertical separation between the embedded seam material and the base plate under long-term operation conditions,reducing the waterproof effect.As the length of the base plate unit increases,the displacement of the track structure shows a non-linear increase in the trend.As the length of the unit plate decreases,the base plate expansion joints decrease.In the high-speed railway section with large annual temperature difference,the length of the base plate unit of the structure can be decreased to reduce the change of the expansion joint between the base plates and the force of the embedded layer.The results of the study can provide a reference basis for the design of the longitudinal length of the base plate of CRTⅢ slab track.关键词
高速铁路/底座板/CRTSⅢ型板式无砟轨道/底座板伸缩缝/温度荷载Key words
high-speed railway/base plate/CRTSⅢ slab track/expansion joint of base plate/temperature loading分类
交通工程引用本文复制引用
魏绍磊,肖宏,钱忠霞,陈广生,张雅文..高速铁路CRTSⅢ型板式无砟轨道伸缩缝变化研究[J].铁道科学与工程学报,2025,22(8):3339-3351,13.基金项目
国家重点研发计划(2023YFB2604302) （2023YFB2604302）
国家自然科学基金资助项目(U2468231) （U2468231）
中央高校基本科研业务费专项资金资助项目(科技领军人才团队项目)(2022JBX7010) （科技领军人才团队项目）
