双块式无砟轨道温度场监测方法研究  

Monitoring method of temperature field on bi-block ballastless track

作　　者：毕澜潇 赵坪锐[1] 邢梦婷 龚闯[1] 

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

出　　处：《铁道科学与工程学报》2016年第9期1667-1673,共7页Journal of Railway Science and Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2013CB0036202);国家自然科学基金重点项目(U1434208);中国铁路总公司重大项目资助项目(Z2013-G001;Z2014G001-A);中央高校基本科研业务费专项资金资助项目(SWJTU12CX065)

摘　　要：由于构成无砟轨道主体结构的材料为混凝土等热的不良导体和温度敏感材料,无砟轨道内部温度场的分布特性受环境影响很大,且对无砟轨道受力状态有较大影响,而目前关于无砟轨道温度场的系统研究刚刚开始,急需建立一套合理可行的无砟轨道温度场监测方法为温度应力的计算和无砟轨道设计提供真实可靠的基础参数。为在制定监测方案时合理确定测点位置,对双块式无砟轨道温度场进行了有限元模拟和实测,通过对无砟轨道温度场分布特性分析对混凝土内部温度传感器的布设提出建议。研究结果表明:轨道结构对称部位的温度分布基本相同,轨道结构边角部分温度变化幅度较大;距侧边约30 cm以上的轨道结构内部温度场分布基本相同,在场地有限的情况下,可建立较小的试验段进行测试,要获取无砟轨道整体温度梯度参数,测点布置应距板边至少30 cm以上;采用钢筋、木条等热传导性与混凝土差别较大的材料作为温度传感器附着物时测得的轨道结构温度场同轨道结构实际情况有一定差别,应尽量选择与混凝土类似的材料作为温度传感器的附着物。Ballastless track is a composite structure made of reinforced concrete material.Because of the thermal conductivity properties of track structure,the change of surrounding environmental conditions affects the tempera-ture field and stress of track.The systematic study of ballastless track temperature field has just begun.In order to provide reliable parameters for the calculation of temperature stress and ballastless track design, it needs to estab-lish a set of methods to monitor ballastless track temperature field.The measured data and the results of numerical simulations show that the temperature distribution of the symmetric part of the structure is basically the same,and the marginal part of the track structure have large variation in concrete temperature. More than about 30 cm from the track side,the temperature field distribution inside the track structure is basically the same.Due to the limited testing ground, establishing a small test model for the test is acceptable.The temperature field data measured by the method of installing sensors on different kinds of materials, such as steel, wood etc, have a certain difference from the actual situation of track structure.

关 键 词：无砟轨道 温度场 有限元 温度荷载 

分 类 号：U213.244[交通运输工程—道路与铁道工程]