Seismic Assessment of Ballasted Tracks in Large-scale Earthquakes

The authors have concerns that even if no visible defects are found in on-site inspections, ballast of ballasted tracks will become loose in the event of a large-scale earthquake. Much labor and time are required before operation restart can be decided, since inspections of CWR creeping and measurement of lateral ballast resistance force are needed. By laying a full-size track on a shaking table tester, the authors observed ballast behavior and measured lateral ballast resistance force when shaking the track at different vibration accelerations and vibration frequencies in this research. The purpose of such testing is quantitative ballasted track seismic assessment. Test results clarified that the vibration acceleration at which lateral ballast resistance force decreases is around 750 gal and the vibration acceleration at which ballast is disturbed is around 600 gal. The authors also found that the decrease of lateral ballast resistance force and the disturbance of ballast have little dependence on frequencies in the range of 1 to 10 Hz. The authors also confirmed that those could be applied to operation handling rules in the event of a large-scale earthquake.

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  • English

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  • Accession Number: 01337702
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 20 2011 4:53PM