西南交通大学学报2023，Vol.58Issue(6)：1385-1393,9.DOI:10.3969/j.issn.0258-2724.20211094
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
摘要
Abstract
In order to explore the long-term monitoring method of bi-block ballastless track sleeper pressure,this paper took the CRTSⅠbi-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Key words
bi-block sleeper/fiber Bragg grating strain sensor/sleeper pressure/long-term monitoring method分类
交通运输引用本文复制引用
李培刚,兰才昊,魏强,李俊奇,刘增杰,杨永明..双块式无砟轨道枕上压力监测标定方法[J].西南交通大学学报,2023,58(6):1385-1393,9.基金项目
国家自然科学基金(51608317) （51608317）
中国国家铁路集团有限公司科技研究开发计划项目(K2020G031) （K2020G031）
