基于关联维数的CRTSII型板式无砟轨道层间离缝状态评价  

Evaluation of interlayer separation state of CRTSII slab ballastless track based on correlation dimension

作　　者：路宏遥 何越磊[1] 方若望 LU Hongyao;HE Yuelei;FANG Ruowang(School of Urban Rail Transportation,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学城市轨道交通学院,上海201620

出　　处：《铁道科学与工程学报》2023年第3期745-752,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51978393)。

摘　　要：CRTSII型板式无砟轨道为多层结构体系,层间可靠的黏结是保证高速列车运行安全的前提。在温度荷载的循环作用下,轨道板与砂浆层间出现不协调的温度变形,导致层间离缝等病害的产生与扩展。为对层间离缝状态进行有效监测与科学评估,搭建无砟轨道关键参数监测系统,对服役状态下无砟轨道的板温与层间离缝宽度变化进行长期监测。基于非线性系统的混沌理论,对板温与离缝宽度时间序列的混沌性进行识别,并提出应用关联维数的层间离缝状态宏-微观映射关系分析方法。研究结果表明:纵连板式无砟轨道离缝状态与板温密切相关,处于锁定板温附近时,离缝宽度变化时间序列对应的关联维数最大。在微观层面,层间离缝的扩展可分为裂纹萌生、扩展与贯通的循环过程,结合不同阶段关联维数的变化趋势,建议取离缝宽度达到2.0 mm时为维修阈值。在宏观层面,无砟轨道在不同服役阶段即使离缝宽度相同,因层间黏结质量不断劣化,导致隐蔽性离缝深度指标存在较大差异,可结合关联维数的变化对层间离缝实际状态综合评价。研究成果可为无砟轨道维修标准的制定提供参考,科学指导线路养护工作。As a multi-layer structure system,reliable bonding between layers of CRTSII slab ballastless track is the premise to ensure the safety of high-speed train operation.Under the cyclic action of temperature load,the uncoordinated temperature deformation between the track plate and the mortar layer will lead to the occurrence and expansion of interlayer separation.In order to effectively monitor and scientifically evaluate the state of interlayer separation,a key parameter monitoring system for ballastless track was built to monitor the changes of slab temperature and interlayer separation width of ballastless track in service.Based on the chaos theory of nonlinear system,the chaos of time series of slab temperature and separation width were identified.The analysis method of macro micro mapping relationship of interlayer slit state based on correlation dimension was proposed.The research shows that the separation state of longitudinal slab ballastless track is closely related to the slab temperature.When it is near the locked slab temperature,the correlation dimension corresponding to the change time series of separation width is the largest.At the micro level,the propagation of interlayer separation crack can be divided into the cyclic process of crack initiation,propagation and penetration.Combined with the change trend of correlation dimension in different stages,it is suggested that the maintenance threshold is when the separation width reaches 2.0 mm.At the macro level,even if the separation width of ballastless track is the same in different service stages,the hidden gap depth index is quite different due to the continuous deterioration of interlayer bonding quality.Combined with the change of correlation dimension,the actual state of interlayer separation joint can be comprehensively evaluated.The research results can provide reference for the formulation of ballastless track maintenance standards and scientifically guide the line maintenance work.

关 键 词：无砟轨道 参数监测 关联维数 层间离缝 宏微观分析 科学评价 

分 类 号：U216.9[交通运输工程—道路与铁道工程]