STEADY STATE RESPONSE OF A GRANULAR LAYER TO A MOVING LOAD--A DISCRETE MODEL

This paper discusses the steady state response of a rigidly supported, granular layer to a moving load. Accordingly, the dynamic behavior of a ballast layer under an instantaneous train axle passage is simulated, where the rigid support reflects a substratum that is much stiffer than the ballast layer. The discrete nature of the layer is captured via a 9-cell square lattice. After deriving the equations of motion for the lattice, the long-wave approximation of the equations of motion is compared with the equations of motion for a continuum model. This leads to relations between the macroscopic constitutive parameters of the continuum and the microscopic constitutive parameters of the discrete lattice. Next, the boundary value problem is formulated and solved. The influence by the particle size, the damping characteristics, and the load velocity on the layer response are demonstrated by means of a parametric study.

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  • Corporate Authors:

    Delft University of Technology

    Faculty of Civil Engineering, Stevin Laboratory, P.O. Box 5048
    2600 GA Delft,   Netherlands 
  • Authors:
    • Suiker, ASJ
    • METRIKINE, A V
    • DE BORST, R
  • Publication Date: 2000

Language

  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 75-87
  • Serial:
    • Heron
    • Volume: 45
    • Issue Number: 1
    • Publisher: Delft University of Technology
    • ISSN: 0046-7316

Subject/Index Terms

Filing Info

  • Accession Number: 00797638
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 14 2001 12:00AM