市域快轨梯形轨枕无砟轨道在线实测及分析

总结分析2023年在国家铁道试验中心环行线完成的最高时速220km/h条件下，市域快轨梯形轨枕无砟轨道相对于普通有砟轨道的安全性、平稳性及减振效果等测试方案及测试结果。测试列车为8辆编组CRH380AJ综合检测车，测试指标包括：脱轨系数、轮重减载率、轮轴横向力等安全性及稳定性指标，钢轨及轨枕垂、横向动态位移等变形指标，钢轨垂、横向振动加速度等振动特性指标，以及距线路中心线3.5 m处路基表面的减振效果等。测试结果表明：市域快轨梯形轨枕无砟轨道的各项指标均低于相关规范标准限值，且与有砟轨道相近，表明市域快轨梯形轨枕在安全性、稳定性及钢轨振动特性方面可满足220 km/h速度级应用要求；市域快轨梯形轨枕无砟轨道相对于普通有砟轨道的减振效果按不同计权方式分别为3.3～5.1 dB、4.4～6.8 dB。本次测试成果可为市域快轨及城际铁路轨道减振技术应用提供借鉴与参考。

Field Test of Safety, Stability, and Vibration Reduction ofLadder-Sleeper Track in Urban Rapid Rail Transit

This study comprehensively summarizes the testing scheme and results of a ladder-sleeper ballastless track in urbanrapid rail transit for safety, stability, and vibration reduction performance compared with an ordinary ballasted track at a maximumspeed of 220 km/h on the National Railway Test Center Circular Line in 2023. The test used eight CRH380AJ comprehensiveinspection units, including the safety and stability of the wheelset derailment coefficient, wheel load reduction rate, wheel–raillateral force, vertical and lateral dynamic displacement indicators of the rail and sleeper, vertical and lateral vibration characteristicsof 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 existingballasted track. The test results show that the safety, stability, and wheel–rail vibration characteristics of the ladder-sleeperballastless track in urban rapid rail transit can satisfy the requirements of the line at a speed of 220 km/h. According to differentweighting methods, the average vibration reduction of the ladder-sleeper ballastless track compared with an ordinary ballastedtrack 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 railtransit and intercity railway track vibration reduction technologies.