摘要
运营期间的CRTS Ⅱ型板式无砟轨道在温度梯度荷载不断的作用下,轨道板与砂浆层之间会脱粘开裂,出现离缝,是无砟道床伤损形式之一。选择华东地区一高速铁路路基段设置测试工点,对轨道结构温度梯度及气温进行监测,并计算轨道板温度梯度极值。计算结果表明,测试期间出现的最大正温度梯度超过设计规定值。基于此,采用有限元方法建模并计算分析温度梯度荷载作用下轨道板与砂浆层间离缝的特征。结果表明,90℃/m正温度梯度荷载作用下,离缝由板端开始产生,并随温度梯度增大逐渐向板中心区域扩展。这与现场调研情况吻合。华东地区高速铁路线路高温季节出现过大的正温度梯度是轨道板与砂浆层间离缝产生和发展的主要原因之一。
During the operation period,the interlayer surface between the track slab and the mortar layer of CRTSⅡ slab ballastless track may debonding under the continuous action of the temperature gradient load.Then interface seammay form,which is one of the damage forms of the ballastless track bed.In this paper,a test site was set up in the subgrade of certain high speed railway in East China,and the temperature gradient of track slab and air temperature were monitored,and the maximumtemperature gradient of track structure was calculated.The calculation results showed that the maximumpositive temperature gradient that occurred during the test exceeded the design specification.Based on this phenomenon,the characteristics of the interface seambetween track slab and mortar layer under temperature gradient load were analyzed by the finite element method.The analysis results showthat under the action of 90 ℃/mpositive temperature gradient load,the interface seamstarts fromthe slab end and gradually expands to the central region of slab with the increase of temperature gradient.This results coincide with the investigation situation.The excessive positive temperature gradient of high speed railway track in East China in hot season is one of the main reasons for the generation and development of the interface seambetween track slab and mortar layer.
作者
何元庆
HE Yuanqing(Shanghai-Hangzhou Railway Passenger Dedicated Railway Co., Ltd., Shanghai 200071, China)
出处
《铁道建筑》
北大核心
2017年第4期102-105,共4页
Railway Engineering
基金
上海铁路局科技研究开发计划(20160285)
关键词
高速铁路
无砟轨道
CRTS
Ⅱ型轨道板
现场测试
有限元分析
温度梯度
离缝
High speed railway
Ballastless track
CRTS Ⅱ track slab
Field test
Finite element analysis
Temperature gradient
Interface seam
