Modeling of Rail Track Substructure Soil Plasticity Modeling

Elastic modeling of soil is unable to capture permanent deformation and settlement in soil that may come from rail applications. In addition, elastic models may not correctly predict dynamic deformation of soil. The authors modify a soil model an elasto-viscoplastic soil model to account for better performance at low mean stresses and improve its numerical implementation. The authors modify the Sandia Geomodel, a three-invariant, cap plasticity model with isotropic and kinematic hardening, with a tension cap for more realistic behavior in the tensile regime. The authors rewrite the yield function in terms of homogenous function of order one to prevent spurious solutions that troubled previous implementations. Finally, the authors create an algorithm to determine from the trial state whether they are on the shear or cap surface, enhancing robustness. These are implemented in a fully implicit, unconditionally stable return-mapping algorithm.

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  • Supplemental Notes:
    • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program. This report consists of two distinct documents: "Modeling of Rail Track Substructure Soil Plasticity Modeling" and "Modeling of Rail Track Substructure Linear Elastic Coupling."
  • Corporate Authors:

    National University Rail Center (NURail)

    University of Illinois at Urbana-Champaign
    Department of Civil and Environmental Engineering, 205 N. Mathews Avenue
    Urbana, IL  United States  61801

    Research and Innovative Technology Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Foster, Craig
    • Motamedi, Mohammad Hosein
  • Publication Date: 2015-9-30

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 42p

Subject/Index Terms

Filing Info

  • Accession Number: 01599274
  • Record Type: Publication
  • Report/Paper Numbers: NURail2012-UIC-R01-B
  • Contract Numbers: DTRT12-G-UTC18
  • Files: UTC, TRIS, RITA, ATRI, USDOT
  • Created Date: Apr 27 2016 9:34AM