Investigation on Dynamic Responses Induced by High-Speed Trains Using a New Time-Frequency Joint Method

With the highly advanced high-speed railways (HSRs) and enhancement of the speed of high-speed trains (HSTs), the environmental vibration problems caused by HSTs have become more prominent. Thus, to fully estimate the dynamic responses of the special condition sites along the HSR, an integrated time-frequency approach was proposed to analyze the vibration propagation characteristics in time, frequency, and time-frequency domains. Firstly, a field measurement was performed to record the acceleration responses along the slope at the embankment along the Baoji-Lanzhou HSR. Then, the dynamic responses of the slope were fully analyzed based on this new integrated time-frequency approach. The results show that the horizontal vibrations are evidently larger than the vertical vibrations along the slope. The peak acceleration and peak instantaneous energy gradually decrease with the increase of distance from the embankment, but both values in the horizontal and vertical directions are amplified at 35.3m. The effects of HST's speed on the dynamic responses of the slope gradually decrease with the increase of distance from the embankment. Besides, the vibrations along the slope are concentrated at 20 similar to 80 Hz, and the high-frequency vibrations rapidly attenuate with the distance, but the low-frequency vibrations hardly decay along the slope.