钢轨维修对高速铁路轨道平顺性的影响分析

钢轨维修是高速铁路轨道结构修理的核心作业内容，其对线路平顺性的影响直接关系到维修作业计划的有效制定. 针对某300 km/h高速铁路无砟轨道钢轨维修前后的轨检数据，分析1~42 m和1~120 m波长区间高低及轨向不平顺的时域、频域以及与车辆振动加速度的相干函数，确定钢轨维修对轨道平顺性的影响. 结果表明:钢轨维修仅对1~120 m的轨向不平顺轨道质量指数（Track Quality Index, TQI）有显著改善作用，使其降低约0.7 mm；在轨道不平顺频域分布上，钢轨维修作业对于轨道不平顺波长的组成没有显著作用，仅对于波长3 m以下轨道不平顺有一定的改善作用；钢轨维修作业对改善列车垂向振动有一定的效果.

Analysis on influence of rail maintenance on rail smoothness of high-speed railway

Rail maintenance is the core operation content of high-speed railway track structure repair, and its influence on line smoothness is directly related to the effective formulation of maintenance operation plans. Based on the track inspection data before and after maintaining of ballastless track of a 300 km/h high-speed railway, the time domain and frequency domain of vertical profile and track alignment irregularities and the coherent function with the vehicle vibration acceleration were analyzed, in the wavelength range of 1~42 m and 1~120 m, the influence of rail maintenance on track irregularity was figured out. The results show that the rail maintenance operation can only significantly improve track alignment irregularity track quality index (TQI) of 1~120 m. In the frequency domain distribution of track irregularity, rail maintenance has no significant effect on the composition of track irregularity wavelength, but improves the short-wave irregularity. Rail maintenance has certain effect on improving vertical vibration of train.