双块式无砟轨道枕上压力监测标定方法  

Calibration Method of Bi-block Ballastless Track Monitoring on Sleeper Pressure

作　　者：李培刚 兰才昊 魏强 李俊奇 刘增杰 杨永明 LI Peigang;LAN Caihao;WEI Qiang;LI Junqi;LIU Zengjie;YANG Yongming(Faculty of Railway Transportation,Shanghai Institute of Technology,Shanghai 201418,China;MOE Key Laboratory of High-Speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China;Engineering Management Center,China State Railway Group Co.,Ltd.,Beijing 100844,China)

机构地区：[1]上海应用技术大学轨道交通学院,上海201418 [2]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 [3]中国国家铁路集团有限公司工程管理中心,北京100844

出　　处：《西南交通大学学报》2023年第6期1385-1393,共9页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金(51608317);中国国家铁路集团有限公司科技研究开发计划项目(K2020G031)。

摘　　要：为探寻双块式无砟轨道枕上压力的长期监测方法,以CRTSⅠ型双块式轨枕为研究对象,首次利用埋入式光纤光栅传感器研究了双块式轨枕内部应变值和枕上压力的线性关系.首先,在轨枕制造阶段埋入FRP-OF光纤光栅应变传感器,用于测试轨枕内部应变变化;其次,通过反力架和千斤顶对轨枕进行静力加载标定,分析轨枕表面加载力和轨枕内部应变的线性关系;最后,通过有限元仿真进行验证和修正.结果表明:在轨枕表面施加的载荷和轨枕内部光纤光栅应变传感器的测试值具有良好线性关系,将此线性斜率确定为标定系数(4.90~5.28 kN/με),仿真数据与实测数据的误差在5%以内;对比轨枕在反力架约束和在道床板约束两种不同边界条件工况下的枕内应变,修正了枕上压力计算式,提出了一种基于双块式轨枕内部应变的枕上压力计算方法,并在高速铁路运营线路上测得枕上压力约为30~42 kN;该方法为高速铁路轮轨荷载传递研究、无砟轨道结构的强度计算理论和方法的完善以及列车轮对状态监测提供重要依据.In order to explore the long-term monitoring method of bi-block ballastless track sleeper pressure,this paper took the CRTSⅠ bi-block sleeper as the research object and studied the linear relationship between the internal strain values and the sleeper pressure by using the embedded fiber Bragg grating sensor.Firstly,the fiber reinforced polymer-optical fiber(FRP-OF) strain sensor was embedded in the sleeper at the manufacturing stage.Secondly,the sleeper was calibrated under static load by the reaction rack and jack,and the linear relationship between the surface loading force and the internal strain of the sleeper was analyzed.Finally,the finite element simulation was used for verification and correction.The results show that the load applied on the sleeper surface has a good linear relationship with the measured value of the FRP-OF strain sensor inside the sleeper.The slope of this linearity is determined as the calibration coefficient,with a range of about 4.90–5.28 kN/με.The error rate between simulation data and measured data is within 5%.The internal strains of the sleeper are compared under two different boundary conditions:reaction frame constraint and track slab constraint,and the equation for calculating sleeper pressure is corrected.As a result,a calculation method of sleeper pressure based on the internal strain of a bi-block sleeper is presented,and the sleeper pressure measured on a high-speed railway operating line is about 30 –42 kN.This method provides an important basis for studying the wheel/rail force transfer,improving strength calculation theory and method of ballastless track structures,and monitoring the condition of wheels of high-speed railways.

关 键 词：双块式轨枕 光纤光栅应变传感器 枕上压力 长期监测方法 

分 类 号：U213.212[交通运输工程—道路与铁道工程]