基于面波多道分析法的无砟轨道性能劣化反演方法

Inversion Method of Ballastless Track Performance Degradation Based on Multi-channel Analysis of Surface Waves

摘要:

提出了基于面波多道分析法的无砟轨道性能劣化反演方法。以无砟轨道理论面波频散曲线为基础，分析具有不同劣化程度的无砟轨道面波频散特性，构建无砟轨道性能劣化反演方法，并研究激振频率与检波器布设方式对反演效果的影响。结果表明：无砟轨道的面波频散曲线在低频与高频段分别取决于CA砂浆与轨道板的横波速度。为提高反演效果，建议将激振频率取为50 kHz，最小偏移距取大于或等于0.05 m，道间距取0.05 m，并尽可能增大检波器排列长度。

关键词:无砟轨道;面波多道分析;频散特性;反演;性能劣化

Abstract:

The inversion method of ballastless track performance degradation based on the multi-channel analysis of surface waves was proposed. Based on the theoretical surface wave dispersion curve， the dispersion characteristics of ballastless tracks with varying degrees of degradation were analyzed. A method for inverting the ballastless track performance degradation was constructed， and the effect of excitation frequency and detector placement mode on the inversion effect was studied. The results indicate that the shear wave velocity of CA mortar and track slabs respectively determines the surface wave dispersion curve of ballastless tracks at low and high frequencies. To enhance the inversion effect， the excitation frequency is recommended to be set at 50 kHz， the minimum offset distance should be greater than or equal to 0.05 m， and the channel spacing between tracks should be 0.05 m. Moreover， the length of the detector arrangement should be increased as much as possible.

Key words:ballastless track;multi-channel analysis of surface wave;dispersion characteristics;inversion;performance degradation