Field Test of Safety,Stability,and Vibration Reduction of Ladder-Sleeper Track in Urban Rapid Rail Transit
This study comprehensively summarizes the testing scheme and results of a ladder-sleeper ballastless track in urban rapid rail transit for safety,stability,and vibration reduction performance compared with an ordinary ballasted track at a maximum speed of 220 km/h on the National Railway Test Center Circular Line in 2023.The test used eight CRH380AJ comprehensive inspection units,including the safety and stability of the wheelset derailment coefficient,wheel load reduction rate,wheel-rail lateral force,vertical and lateral dynamic displacement indicators of the rail and sleeper,vertical and lateral vibration characteristics of the rail,and vibration reduction performance of the roadbed surface at a distance of 3.5 m from the centerline of the line.The test results for these indices were lower than the limits of the corresponding standards and close to those for the existing ballasted track.The test results show that the safety,stability,and wheel-rail vibration characteristics of the ladder-sleeper ballastless track in urban rapid rail transit can satisfy the requirements of the line at a speed of 220 km/h.According to different weighting methods,the average vibration reduction of the ladder-sleeper ballastless track compared with an ordinary ballasted track in urban rapid rail transit can reach 3.3-5.1 dB and 4.4-6.8 dB.The test results provide a reference for urban rapid rail transit and intercity railway track vibration reduction technologies.
万方数据
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