高铁路堤段列车进出站加减速阶段振动特性实测

Field Measurement of Vibration Characteristics During Acceleration and Deceleration of Train Entry and Exit along Embankment Sections of High‑speed Railways

摘要:

为研究高铁进出站加减速阶段列车运行引起的路堤段地面不同位置处振动特性，实测了阜阳西站附近郑阜高铁和商合杭高铁之间路堤段地面振动，对比不同线路上不同列车加减速引起的地面不同方向上振动加速度时频曲线，研究了列车车型、列车运行状态和高铁线路型式对地面振动特性的影响。研究结果表明，列车车型对靠近轨道处地面沿轨道方向振动影响明显。列车运行加速度较小时，列车不同轮对产生的地面振动加速度峰值差异较小。列车车型主要改变地面水平方向振动频谱特性。列车运行状态对距轨道较远处地面水平方向振动加速度峰值影响较大，对不同位置处地面竖向振动主频影响较大。商合杭高铁和郑阜高铁列车运行产生的地面振动反弹增大现象出现的位置不同。郑阜高铁线上不同列车对距轨道中心较远处地面振动影响较商合杭高铁线大。商合杭高铁列车运行引起的地面水平方向振动主频整体随与轨道中心间距增加而增大，郑阜线上不同方向振动主频随与轨道中心间距增加未呈现明显的变化规律。商合杭高铁上不同列车运行产生的地面水平方向加速度振动主频差异较小，在郑阜高铁上不同列车运行产生的振动主频差异较大。

Abstract:

To investigate the vibration characteristics at different ground locations of embankment sections caused by train acceleration and decel-eration during entry and exit of high-speed railway stations, field measurements were conducted on ground vibrations along the em-bankment section between the Zhengzhou-Fuyang high-speed railway and the Shangqiu-Hefei-Hangzhou high-speed railway near Fuyang West station. The time-frequency curves of vibration accelerations in different directions on the ground caused by acceleration and deceleration of different trains on different lines were compared. The effects of train type, train operating status, and high-speed railway line type on the ground vibration characteristics were investigated. The results showed that the train type significantly affected the ground vibration along the track direction near the rails. When the acceleration of the train was small, the differences in the peak values of ground vibration acceleration caused by different wheelsets were relatively small. Train type primarily altered the spectral characteristics of ground vibrations in the horizontal direction. The train operating status had a considerable effect on the peak values of horizontal ground vibration accelerations at locations farther from the track, and a greater effect on the dominant frequencies of vertical ground vibrations at different locations. The locations where the ground vibration rebound amplification phenomenon occurred differed between trains on the Shangqiu-Hefei-Hangzhou high-speed railway and Zhengzhou-Fuyang high-speed railway. Trains on the Zheng-zhou-Fuyang high-speed railway had a greater impact on ground vibrations at locations farther from the track center compared to those on the Shangqiu-Hefei-Hangzhou high-speed railway. The dominant frequencies of horizontal ground vibrations induced by trains on the Shangqiu-HefeiHangzhou high-speed railway generally increased with increasing distance from the track center. In contrast, the dominant frequencies of vibrations in different directions on the Zhengzhou-Fuyang line did not exhibit a distinct variation pattern with increasing distance from the track center. The differences in the dominant frequencies of horizontal ground vibrations caused by differ-ent trains on the Shangqiu-Hefei-Hangzhou high-speed railway were relatively small, whereas significant differences were observed for those on the Zhengzhou-Fuyang high-speed railway.