无砟轨道层间离缝浸水条件下湿度影响范围分析  

Analysis of humidity influence range under immersion between interlayer seams in a ballastless track

作　　者：刘佳[1] 杨荣山[1] 胡猛 张建清 吴梦瑶[1] LIU Jia;YANG Rongshan;HU Meng;ZHANG Jianqing;WU Mengyao(MOE Key Laboratory of High-Speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,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

出　　处：《铁道科学与工程学报》2019年第5期1113-1119,共7页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(5177081383)

摘　　要：针对水致材料软化对无砟轨道的水致损伤,总结无砟轨道水致材料软化病害的现象及危害,以路基上CRTSⅠ型双块式无砟轨道为例,借助ANSYS热分析模块建立CRTSⅠ型双块式无砟轨道湿度场分布模型。研究结果表明:离缝内部浸水导致浸水边界附近的湿度差急剧增加,位于浸水边界越近的位置,其湿度差的变化梯度越明显,且最终趋于稳定。裂缝浸水后,其横向湿度影响范围约为0.1m,竖向影响范围约为0.15m。在开口量不变的条件下,离缝越深,对结构内部湿度的影响也越明显。建议无砟轨道设计时考虑水致材料软化的影响,做好排水设计,确保轨道结构的耐久性。The deterioration of material caused by accumulated water is the leading cause and foundation of water-induced damage in ballastless tracks.This article summarized the appearance characteristics and hazards of the material softening diseases caused by water in ballastless track.Taking the CRTSI double-block ballastless track on the roadbed as an example,the humidity distribution model of the CRTSI double-block ballastless track was established and analyzed with ANSYS thermal analysis module.The results show that the water immersion in the interior of the crack leads to a sharp increase in the humidity difference near the immersed water boundary.The closer to the immersed water boundary,the more pronounced the change gradient of the humidity difference,and finally tends to be stable.Under the condition that the opening amount is constant,the deeper the crack,the more obvious the effect on the humidity of the structure.It is suggested that considering the water can lead to softening of the material in the design of ballastless track and good drainage design to ensure the durability of the track structure.

关 键 词：双块式无砟轨道 离缝 水致材料软化 湿度差 湿度影响范围 

分 类 号：U213.244[交通运输工程—道路与铁道工程]