基于热力耦合的桥隧过渡段无砟轨道温度效应分析  

Analysis of Temperature Effect of Ballastless Track in Bridge-tunnelTransition Section Based on Thermo-mechanical Coupling

作　　者：陈泽林 蔡小培[1] 赵磊 董博 张乾 CHEN Zelin;CAI Xiaopei;ZHAO Lei;DONG Bo;ZHANG Qian(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道学报》2023年第4期84-91,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(52178405,51908552);中央高校基本科研业务费(2018JBZ003)。

摘　　要：为研究高温环境下高速铁路桥隧过渡段无砟轨道的温度分布和受力与变形特征,基于赣深高速铁路桥隧过渡段无砟轨道温度测试,提出无砟轨道纵向温度分布荷载模式,建立桥隧过渡段无砟轨道热力耦合模型,通过实测数据验证了模型有效性。在此基础上,分析过渡段无砟轨道的温度场分布及其内部力与位移传递规律。结果表明:高温环境下,从隧道外到隧道内,无砟轨道温度变化幅值不断减小,在距隧道口超过44 m后,温度基本稳定;实测无砟轨道表面温度沿纵向变化幅值为27.12℃,在14:00达到纵向最大温度变化率5.17℃/m;采用分段函数对桥隧过渡段纵向温度分布进行拟合,在无砟轨道纵向温度变化率最大区段,轨道板纵向应力达到1.41 MPa,轨道最大垂向位移1.50 mm。To study the temperature distribution and the force and deformation characteristics of the ballastless track in the bridge-tunnel transition section of high-speed railway under the natural environment of high-temperature seasons,based on the temperature test of ballastless track in the bridge-tunnel transition section of Ganzhou-Shenzhen high-speed railway,a longitudinal temperature gradient loading mode for ballastless track was proposed,along with the establishment of a thermo-mechanical coupling model of ballastless track in bridge-tunnel transition section.The validity of the model was verified through the actual measurement data.On this basis,the temperature field distribution,the internal force and the displacement transfer law of the ballastless track in the transition section were analyzed.The results show that the amplitude of temperature change of ballastless track decreases from outside the tunnel to inside the tunnel in a high-temperature environment.When the distance from the tunnel portal exceeds 44 m,the temperature is basically stable.The maximum longitudinal variation of the ballastless track surface temperature is 27.12℃,and the maximum longitudinal temperature change rate reaches 5.17℃/m at 14:00.The longitudinal difference of ballastless track temperature in the transition section is fitted by the segmental function.In the section with the maximum longitudinal temperature change rate of the ballastless track,the longitudinal stress of the track slab reaches 1.41 MPa,with 1.50 mm maximum vertical displacement of the track.

关 键 词：高速铁路 桥隧过渡段 无砟轨道 温度效应 热力耦合 

分 类 号：U213.2[交通运输工程—道路与铁道工程]