考虑波长因素的提速线路捣固作业质量评价方法研究

Research on quality evaluation method of ballast tamping operation for raising speed railway considering the factor of wavelength

捣固作业质量直接关系到线路轨道服役状态,多维度研究捣固作业后轨道几何形位的变化规律是有效提升线路捣固作业效率的关键。以某160 km/h提速干线改造工程为例,提出考虑波长因素的捣固方案,针对捣固作业后的轨道几何形位的变化,分析轨道静态不平顺数据及动态不平顺数据,研究70 m弦矢高、轨道质量指数、功率谱密度、小波变换、小波能量谱等时频分布特征,确定捣固作业前后轨道不平顺波长及幅值的变化规律。研究结果表明:考虑波长因素的捣固作业方法可以有效地改善线路的长波不平顺状态,高低不平顺的改善效果优于轨向不平顺;曲线区段改善率大于直线区段且曲线轨道质量改善率随圆曲线半径的增大而降低;线路线形得到基本控制后不能通过盲目地增加捣固作业次数来达到改善轨道质量的目的。

The quality of ballast tamping operation is directly related to the service status of the railway track.Multi-dimensional discussion of the change rule for track geometry after the ballast tamping operation is the key to effectively improving the efficiency of ballast tamping operation.This paper discussed the ballast tamping scheme considering the factor of wavelength.Starting from the changes in track geometry after ballast tamping operation,this work analyzed the static and dynamic irregularities data of track by taking a 160km/h speed-increasing trunk line reconstruction project as an example,and further studied the time-frequency distribution characteristics of the Rise of Arch of 70-meter Chord,Track Quality Index,Power Spectral Density,Wavelet Transform,and Wavelet Energy Spectrum.This paper finally determined the variation law of wavelength and amplitude about the track irregularities before and after the ballast tamping operation.The result shows that the ballast tamping operation method considering the factor of wavelength can effectively improve the long-wave irregularities state of the track.The improvement effect of the vertical irregularities is better than that of the alignment irregularities.The improvement rate of the curved section is greater than that of the straight line section.The improvement rate of curved track quality decreases with increasing the radius of circular curve.The purpose of improving track quality cannot be achieved by blindly increasing the number of ballast tamping operation after controlling the essential track linear.