Multiaxial response of a microcrack constitutive model for brittle rock

J. W. Rudnicki, K. T. Chau

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

12 Scopus citations

Abstract

This paper describes a model that predicts the moduli for brittle rock loaded by compressive principal stresses. All inelastic deformation is assumed due to microcracks that open under local tensile stresses caused by small scale heterogeneities. For axisymmetric loading and an isotropic initial distribution of cracks, the model predicts that crack growth begins in the axial direction and expands to a cone of angle 12-15° as loading continues to peak stress. The macroscopic response evolves from isotropic to transversely isotropic and the elastic moduli decrease with ongoing deformation. For combined axisymmetric compression (a) and torsion (r), axial loading causes the damage surface in r vs. a space, separating stress states causing unloading from those that cause continued damage, to evolve from an ellipse to a surface with a sharp vertex at the current stress point.

Original languageEnglish (US)
Title of host publication2nd North American Rock Mechanics Symposium, NARM 1996
Editors Hassani, Mitri, Aubertin
PublisherAmerican Rock Mechanics Association (ARMA)
Pages1707-1714
Number of pages8
ISBN (Print)905410838X, 9789054108382
StatePublished - 1996
Event2nd North American Rock Mechanics Symposium, NARM 1996 - Montreal, Canada
Duration: Jun 19 1996Jun 21 1996

Publication series

Name2nd North American Rock Mechanics Symposium, NARM 1996

Other

Other2nd North American Rock Mechanics Symposium, NARM 1996
Country/TerritoryCanada
CityMontreal
Period6/19/966/21/96

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology
  • Geophysics

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