Abstract
The presence of microcracks in rocks have a significant impact on elastic properties, whereby the characterization and determination of material behavior involves effective properties. Several theories have been developed in an attempt to determine the effective properties of an elastic solid as a function of crack parameters. However, very little experimental work has been performed to support these theories. Two-dimensional experiments were conducted on artificially cracked aluminum plates and the results obtained were compared with some of the existing theories. In the case of a random distribution of cracks, the results show a very good agreement with the non-interacting approximation, even when interactions may be significant. These results were then applied to the characterization of microcracks in Charcoal granite matrix, assuming a random distribution of penny-shaped cracks of radius l. The properties of the matrix material were obtained upon closure of microcracks from the measurement of linear strain and hydrostatic pressure. The matrix modulus of about 84 GPa is reduced to about 50 GPa due to a crack density, defined as the sum of l3 divided by the total volume of the rock, of 39%.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 43.e1-43.e11 |
| Number of pages | 1 |
| Journal | International Journal of Rock Mechanics and Mining Sciences |
| Volume | 34 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Apr 1 1997 |
| Event | Proceedings of the 1997 36th US Rock Mechanics ISRM International Symposium - New York, NY, USA Duration: Jun 29 1997 → Jul 2 1997 |
Bibliographical note
Publisher Copyright:© 1997
Keywords
- bulk modulus
- crack density
- effective modulus
- hydrostatic pressure
- linear elasticity
- microcracked solid
- non-interacting cracks
- random distribution
- tensile tests