无砟轨道层间颗粒冲刷试验研究  

Experimental Study on Particle Erosion of Ballastless Track Interlayer

作　　者：杨荣山[1,2] 林航 刘珀全 牛鑫宇 陈健[1,2] 谭斌 YANG Rongshan;LIN Hang;LIU Poquan;NIU Xinyu;CHEN Jian;TAN Bin(MOE Key Laboratory of High-Speed Railway Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;China Railway 23rd Bureau Group Co.,Ltd.,Chengdu Sichuan 610072,China)

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [2]西南交通大学土木工程学院,四川成都610031 [3]中铁二十三局集团有限公司,四川成都610072

出　　处：《中国铁道科学》2024年第6期81-90,共10页China Railway Science

基　　金：国家自然科学基金资助项目(52272442);四川省科技成果转移转化示范项目(2022ZHCG0013)。

摘　　要：无砟轨道层间界面为其薄弱环节,长期荷载作用下容易发展为层间离缝,在离缝进水后容易产生冒浆病害。为研究列车荷载作用下无砟轨道层间冒浆发生机理,设计无砟轨道层间脱空模拟装置并基于该装置开展无砟轨道层间颗粒冲刷试验;采用双目三维扫描仪获取混凝土表面形貌数据,得到冲刷前后混凝土表面形貌等高线图,对比颗粒流冲刷前后混凝土表面形貌的变化,分析混凝土配合比、颗粒流速度和颗粒粒径对混凝土表面冲刷的影响。结果表明:经900万次高频荷载作用,C15混凝土表面的平均冲刷量约为1.106 mm,C40混凝土表面的平均冲刷量为0.186 mm;在颗粒流冲刷作用下,混凝土表面的粗糙峰冲刷量较大;混凝土表面冲刷量与颗粒流运动速度、混凝土配合比正相关,而与颗粒粒径负相关。The interlayer interface is a weak link of ballastless track,susceptible to the development of interlayer separation joints under long-term loading.Once water infiltrates the separation joints,it can easily cause slurry damage.To study the mechanism of interlayer grouting of the ballastless track under train loading,a simulation device for interlayer detachment of the ballastless track was designed.Using this device,particle erosion tests were conducted on the interlayer of the ballastless track.A binocular 3D scanner was employed to acquire data on the concrete surface morphology.Contour maps depicting the surface morphology of concrete before and after erosion were generated following data processing.The changes in the surface morphology of concrete before and after particle flow erosion were compared,and the effects of concrete mix ratio,particle flow characteristics,and particle size on concrete surface erosion were studied.The results show that after 9 million cycles of high-frequency loading,the average erosion depth on the surface of C15 concrete is about 1.106 mm,and the average erosion depth on the surface of C40 concrete is 0.186 mm.Under the action of particle flow erosion,the rough peak erosion on the concrete surface is relatively large.Concrete surface erosion exhibits a positive correlation with both particle flow velocity and concrete mix ratio,while showing a negative correlation with particle size.

关 键 词：无砟轨道 层间离缝 颗粒冲刷 高频荷载 试验 

分 类 号：U216.3[交通运输工程—道路与铁道工程]