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 language | English (US) |
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| Title of host publication | 2nd North American Rock Mechanics Symposium, NARM 1996 |
| Editors | Hassani, Mitri, Aubertin |
| Publisher | American Rock Mechanics Association (ARMA) |
| Pages | 1707-1714 |
| Number of pages | 8 |
| ISBN (Print) | 905410838X, 9789054108382 |
| State | Published - 1996 |
| Event | 2nd North American Rock Mechanics Symposium, NARM 1996 - Montreal, Canada Duration: Jun 19 1996 → Jun 21 1996 |
Publication series
| Name | 2nd North American Rock Mechanics Symposium, NARM 1996 |
|---|
Other
| Other | 2nd North American Rock Mechanics Symposium, NARM 1996 |
|---|---|
| Country/Territory | Canada |
| City | Montreal |
| Period | 6/19/96 → 6/21/96 |
Funding
A. Olsson and W. A. Wawersik for many helpful suggestionsa nd discussionsF. inancial support for this work was provided by the U.S. Department of Energy, Office of Basic Energy SciencesG, rant
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology
- Geology
- Geophysics