沪宁城际高速铁路轨道质量指数分布规律研究

轨道质量指数(Track Quality Index,TQI)是评价轨道质量状态的重要指标。为了更加科学有效地利用TQI来指导现场的养护维修,需要了解其分布情况。统计分析发现,沪宁城际高速铁路动态不平顺TQI超限主要出现在检测速度不大于180 km/h的数据中,而且集中分布在苏州、无锡、常州、镇江的道岔段。对于检测速度大于180km/h的数据,进行了分布函数的拟合及检验,结果表明:在置信度为95%的情况下,TQI服从对数正态分布;根据近十年的TQI的统计,发现除道岔区段外,TQI年平均值为3.65 mm,标准差为0.44 mm,TQI值大于5 mm的百分比年均值为0.5。

Research on Distribution Rule of Track Quality Index of Shanghai-Nanjing Intercity High-speed Railway

Track Quality Index(TQI) is an important index to evaluate the quality of railway track.In order to more scientifically and effectively use TQI to guide on-site maintenance and repair,it is necessary to know about its distribution rule.Statistical analysis has found that,for the Shanghai-Nanjing Intercity High-speed Railway,these TQI values beyond the limits of dynamic irregularity occur mainly among the data with detection speed of not more than 180 km/h,concentrating in the turnout regions of Suzhou,Wuxi,Changzhou and Zhenjiang.In addition,aiming at those data with detection speed of more than 180 km/h,the distribution function fitting and testing were carried out.The results show that,on condition that the confidence level is 95%,the TQI obeys logarithmic normal distribution.Also according to statistic data on TQI in recent ten years,it has been found that except for turnout regions,TQI's annual average value is 3.65,with a standard deviation of 0.44;for those TQI values of larger than 5,the annual average percentage is 0.5.