FE MODELING OF STRAIN LOCALIZATION IN SOFT ROCK

A finite-element (FE) model of localized deformation in soft rock taking a strong discontinuity approach is presented. The model is formulated within the context of rate-independent, nonassociated Drucker-Prager plasticity with nonlinear cohesion hardening/softening. Strain localization is modeled as a jump in the displacement field and simulated within the framework of the FE method using the standard Galerkin approximation. The model is used to simulate the load-displacement behavior of Gosford sandstone deforming in plane strain, focusing on the prediction of the stress levels necessary to initiate strain localization, based on the strong and weak discontinuity criteria (jumps in displacement and strain, respectively), and on the demonstration of mesh-independence of the FE solutions in the bifurcated state. For the sandstone, the onset of weak discontinuity is detected first, before the onset of strong discontinuity, suggesting a possible coupling of the two types of discontinuities in the strain-softening regime.

  • Availability:
  • Supplemental Notes:
    • Financial support for this research was provided by the G3S division of the National Science Foundation under contract no. CMS-9700426.
  • Corporate Authors:

    American Society of Civil Engineers

    1801 Alexander Bell Drive
    Reston, VA  United States  20191-4400
  • Authors:
    • Borja, R I
    • Regueiro, R A
    • Lai, T Y
  • Publication Date: 2000-4

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00794034
  • Record Type: Publication
  • Contract Numbers: CMS-9700426, CMS-9358268
  • Files: TRIS
  • Created Date: Jun 21 2000 12:00AM