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WANG Lin-feng, ZHU Hong-zhou, SONG Nan-nan, ZOU Zheng, YAO Chang-yin. Impact signal dynamic characteristics of energy dissipation shed tunnel[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 33-41. doi: 10.19818/j.cnki.1671-1637.2019.05.004
Citation: WANG Lin-feng, ZHU Hong-zhou, SONG Nan-nan, ZOU Zheng, YAO Chang-yin. Impact signal dynamic characteristics of energy dissipation shed tunnel[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 33-41. doi: 10.19818/j.cnki.1671-1637.2019.05.004
shu

Impact signal dynamic characteristics of energy dissipation shed tunnel

doi: 10.19818/j.cnki.1671-1637.2019.05.004
  • 1.

    School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, China

  • 2.

    School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China

More Information
  • Author Bio:

    WANG Lin-feng(1983-), male, professor, PhD, wanglinfeng@cqjtu.edu.cn

  • Received Date: 2019-04-03
  • Publish Date: 2019-10-25
    Abstract
  • Considering the rockfall falling height, mass, shape and cushion thickness, the impact signal dynamic characteristics of energy dissipation shed tunnel were studied by the indoor model test. The spectrums and autocorrelation curves of impact signal were obtained. The time-frequency characteristics of impact signal and the vibration frequency and its change law corresponding to the maximum spectrum were analyzed, and the impact signal of each frequency band was extracted based on the wavelet analysis method. The main energy distribution range of impact signal was obtained. Research result shows that the spectrum magnitude of impact signal at the center of shed tunnel roof increases as the rockfall falling height increases, and this spectrum of impact signal has four peaks with a symmetric distribution. When rockfalls with different shapes impact the shed tunnel, the order of spectrum magnitudes of impact signals from big to small is spherical, cuboid, cube and cylindrical. The thicker the ordinary shed tunnel roof cushion and the smaller the rockfall mass, the smaller the spectrum magnitude of impact signal at the center of shed tunnel roof. When a 5 kg spherical rockfall falls from the height of 0.5 m to impact the shed tunnel without cushion at the top, the maximum spectrum of impact signal of energy dissipation shed tunnel and the peak of autocorrelation curves are 60.98% and 82.57% lower than those of ordinary shed tunnel, respectively. When a 5 kg spherical rockfall falls from the height of 2.0 m to impact the shed tunnel without cushion at the top, the rockfall impact energy of energy dissipation shed tunnel mainly distributes in the frequency range of impact signal from 15.625 to 62.500 Hz, accounting for 63.73% of total energy. The rockfall impact energy of ordinary shed tunnel mainly distributes in the frequency range of impact signal from 0 to 15.625 Hz, accounting for 74.30% of total energy. Thus, the medium-frequency impact should be considered priorly when designing an energy dissipation shed tunnel, and the low-frequency impact should be considered priorly when designing an ordinary shed tunnel.

     

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