Research On Monitoring Of Ballastless Track Structure Of High-speed Railway

In recent years,the rapid development of rail transit and the rapid advancement of China’s economy have driven each other.In particular,continuous breakthroughs in high-speed rail technology and high-speed rail mileage have made high-speed rail one of the cards in the world.High-speed railways have always been the first choice for people to travel because of their speed,smooth running,low transportation costs,and low maintenance.These high-quality rail services are inseparable from the advanced technology of the train itself and are closely linked to the structure of the ballastless track that carries it.Therefore,the healthy working state of the high-speed rail ballastless track is the premise of ensuring the safe driving of high-speed trains.Therefore,it is particularly important to grasp the safety status of the ballastless track structure in a timely,accurate and comprehensive manner.Through the scientific and systematic monitoring of the high-speed rail ballastless track structure,timely detection of structural defects or potential structural safety hazards,and an effective analysis and assessment of the structural state,can improve the safety and security of ballastless track structures to some extent.Therefore,the design and construction of ballastless tracks can be guided more safely and scientifically.This article focuses on the development of a monitoring system for high-speed rail ballastless track structures.The main research contents are:Firstly,by reviewing and researching the monitoring literature on the ballastless track structure of high-speed rail at home and abroad,grasping the current research progress in ballastless track monitoring of high-speed rails,summarizing the achievements and deficiencies at home and abroad on the monitoring of high-speed rail ballastless tracks and comparing them.The specific sub-structures and characteristics of several different forms of high-speed rail ballastless track structures are established.According to the characteristics of the CRTSII type plateless ballastless track structures,the finite element model of Abaqus is established to analyze the most unfavorable position of the structure.Secondly,in-depth exploration and systematic expatiation were made on the composition of the monitoring system,its functions,the principles and methods for the determination of monitoring indicators,and the determination of the monitoring sites;and the principles for the selection and deployment of sensors were summarized.In order to lay a good foundation for the selection of sensors for monitoring indicators.Thirdly,refer to the composition and characteristics of the ballastless track structure of the high-speed rail,and the content points of the structural monitoring system.Based on the conclusion of the finite element analysis of the ballastless track structure,combined with the common types of disease and the location of the disease in the ballastless track structure in operation,establish the compliance with the flawless.The fiber grating sensor subsystem monitored by the track structure monitors the distribution of the ballastless track structure of the roadbed section and the bridge section.Finally,on the basis of the design of sensor subsystems in the monitoring of high-speed rail ballastless track structures,the data acquisition and transmission subsystems that meet their own monitoring needs have been established based on their respective monitoring characteristics,sensor types,etc.,and data on the corresponding indicators have been monitored.Processing analysis to compare the stress state of the rails at bridge piers and bridge spans,and the trend of changes with temperature and time;at the same time,to coordinate,integrate the sensor subsystem and data acquisition and transmission subsystem,and propose storage,query,and modification The data management system and user sub-interface design can be classified,managed,updated,etc.