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As China’s high-speed railway network expands, the probability of high-speed rail trains passing each other increases. Vibrations from passing double-track trains on the track and foundation should not be neglected. Based on the 2.5-dimensional finite element theory of saturated ground, a model of train-double track-foundation was established. Considering the vibration excitation caused by track irregularity, the Fourier transform derived the expression of train load in the frequency-wavenumber domain. A FORTRAN calculation program was compiled to assay the vibration properties of saturated foundations under four meeting conditions, and the amplitude amplification factor of the subgrade surface was proposed. The results demonstrate that compared with the single-track train, the track center’s vertical acceleration amplitude and vertical displacement amplitude significantly increase when the double-track trains meet.

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Vibration Characteristics of Saturated Foundation Caused by Double-Track High-Speed Railway

  • 会议论文

  • 发表日期：

    2025年

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  • Ying Wang,
  • Yingjie Jia,
  • Caiqing Zhao,
  • Danyang Li

摘要

As China’s high-speed railway network expands, the probability of high-speed rail trains passing each other increases. Vibrations from passing double-track trains on the track and foundation should not be neglected. Based on the 2.5-dimensional finite element theory of saturated ground, a model of train-double track-foundation was established. Considering the vibration excitation caused by track irregularity, the Fourier transform derived the expression of train load in the frequency-wavenumber domain. A FORTRAN calculation program was compiled to assay the vibration properties of saturated foundations under four meeting conditions, and the amplitude amplification factor of the subgrade surface was proposed. The results demonstrate that compared with the single-track train, the track center’s vertical acceleration amplitude and vertical displacement amplitude significantly increase when the double-track trains meet.