Vibration Characteristic Analysis of Ballast with Different Aspect Ratios by Means of the Discrete Element Method

As an ideal theory for researching granular assemblies, discrete element method (DEM) can explain the mechanical property of ballast track intuitionally. In this research, DEM software Particle Flow Code 3D (PFC3D) is used to investigate the vibration characteristic of ballast stones with different aspect ratios under wheel-rail loading. Accelerations of these ballast stones are extracted. Contrast of ballast vibration characteristic in different positions is carried on to survey the vibration propagation in the ballast layer. Vibration level comparison by means of one third octave analysis is also performed. The result indicates the vibration attenuation along with position change of the ballast. As a result, ballast layer should not be taken as a continuum and assigned with constant parameters such as stiffness and acceleration. Furthermore, one third octave analysis result shows that traditional ballast has higher vibration level in low frequency range. On the contrary, irregular ballast such as long ballast has more significant vibration in high frequency range. Special ballast like flat ballast has lower vibration level in all frequency range. It indicates a loose contact between sleeper and ballast layer and a higher settlement of the ballast track.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 16-23
  • Monograph Title: Geo-China 2016: Resilient Railroad Materials and Structures to Mitigate Climate Change

Subject/Index Terms

Filing Info

  • Accession Number: 01608845
  • Record Type: Publication
  • ISBN: 9780784480113
  • Files: TRIS, ASCE
  • Created Date: Jul 21 2016 3:11PM