高速铁路不同轨下基础无砟轨道不平顺谱的构建及对比分析

Construction and comparative analysis of ballastless track irregularity spectrum with different substructures of high-speed railway

为将高速铁路轨道谱细化以应用到不同工况动力学分析中,基于10条设计速度为350 km/h的典型高速线路轨道不平顺动态检测数据及谱构建算法,对高速线路不同轨下基础无砟轨道谱进行构建分析。首先,对动态检测数据进行预处理,并对不同窗函数、参数模型估计阶数及谱估计算法进行对比分析,选用新矩形窗的改进周期图法计算各类轨道谱,分析谱概率分布特征,提出谱峰自动识别剔除算法并对比不同阶数多项式拟合模型以对随机谱线进行表征,构建CRTSⅠ型、Ⅱ型、Ⅲ型板式及双块式高速铁路路基、桥梁、隧道地段轨道谱,并对各类型不同波段无砟轨道几何状态进行对比分析。研究结果表明:路基、桥梁地段Ⅲ型板线路轨道不平顺状态最优,其次为Ⅱ型板线路、Ⅰ型板线路,双块式随机不平顺状态最差;隧道地段Ⅱ型板线路轨道不平顺状态比双块式的好。

To refine the track spectrum of high-speed railways for dynamic analysis under various operational conditions,the ballastless track spectrum of the foundation under different tracks of the high-speed line were constructed and analyzed,based on dynamic inspection data from 10 typical high-speed lines designed for speeds of 350 km/h and a spectrum construction algorithm.The data were preprocessed,and various window functions,parameter model orders and spectral estimation algorithms were evaluated.A refined periodogram method using a new rectangular window was selected to calculate the track spectra for different types of railways.The probability distribution of the spectral characteristics was analyzed,and an automatic identification and rejection method for spectral peaks was proposed.Different polynomial fitting models of various orders were employed to represent the random spectral lines.The track spectra for CRTS I,II,III slab and double-block in subgrade,bridge,and tunnel sections of high-speed railway were constructed.The geometric state of ballastless tracks across different bands for each type was compared and analyzed based on the proposed spectral lines.The results show that in subgrade and bridge sections,the random irregularity of the CRTS III slab is the best,followed by CRTS II slab line and CRTS I slab line,and the double-block type line is the worst.In the tunnel section,the random irregularity of the CRTS II slab is superior to that of the double-block type.