Coupled DEM/FDM Simulation for Subgrade Stress Analysis under Moving Load

The failure of track structures is closely related to subgrade stress state. In this paper, the discrete element method (DEM) is used to establish the railway ballasted track, and the subgrade system is modeled as a continuum with the finite difference method (FDM), by coupling the DEM/FDM model to simulate mechanical behavior of the railway ballast-subgrade system. After verifying the model according to some previous experimental results and empirical data, the DEM/FDM hybrid simulation is carried out to obtain dynamic stress state of the subgrade with or without the ballast pocket that formed by compaction or just geometry deformation of subgrade. The simulation results show the compaction is accompanied by the initial stress state change and will cause the uneven distribution of stress in subgrade, which has large influence on the status and paths of subgrade stress under the moving load.

Language

  • English

Media Info

  • Media Type: Web
  • Pagination: pp 612-619
  • Monograph Title: ICRT 2017: Railway Development, Operations, and Maintenance

Subject/Index Terms

Filing Info

  • Accession Number: 01869702
  • Record Type: Publication
  • ISBN: 9780784481257
  • Files: TRIS, ASCE
  • Created Date: Jan 9 2023 5:02PM