Ballast support condition affecting crosstie performance investigated through discrete element method

Wenting Hou, Bin Feng, Wei Li, Erol Tutumluer

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper reports on the ballast layer mesoscale behavior, tie-ballast interaction, and ballast-subgrade interaction under five crosstie support conditions, namely full support, lack of rail seat support, lack of center support, high center binding, and severe center binding condition. Discrete Element Method, an effective technique to study particulate natured unbound aggregate materials, i.e., ballast, was adopted in this study. The DEM simulations included one-tie spacing geometry, approximately 11,000 polyhedral particles. The ballast gradation used in DEM models was according to the AREMA No. 3 and No. 4A specifications. The shape properties of ballast particles in DEM models was consistent with field collected samples. The pressure distributions along tie-ballast interface under rail seat load of 10-kips predicted by DEM simulations were in good agreement with the results backcalculated from laboratory tests, which validated the DEM models. Next, DEM simulations considered rail seat loads of 20-kips and 25-kips. The predicted results indicated that support condition is a key factor for predicting normal stress distribution and force transmission within ballast layer. Ballast particles in shoulders and areas with poor support indicated low or negligible contact stresses. Extremely high normal stresses observed in some support conditions often exceeded single particle crushing load limit and thus would cause ballast particle breakage and layer degradation under repeated loading. Further, the tie-ballast pressure captured in some scenarios could be higher than allowable maximum pressure of 85-psi under concrete tie in AREMA standard. Finally, the pressure at bottom of the ballast layer obtained from the DEM simulations were compared with top of subgrade pressure calculated from analytical/empirical equations such as Talbot equation and AREMA manual.

Original languageEnglish (US)
Title of host publication2018 Joint Rail Conference, JRC 2018
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791850978
StatePublished - 2018
Event2018 Joint Rail Conference, JRC 2018 - Pittsburgh, United States
Duration: Apr 18 2018Apr 20 2018

Publication series

Name2018 Joint Rail Conference, JRC 2018


Other2018 Joint Rail Conference, JRC 2018
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Transportation
  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Automotive Engineering


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