Abstract
A new microcrack based continuous damage model is developed to describe the behavior of brittle geomaterials under compression dominated stress fields. The induced damage is represented by a second rank tensor. The effective elastic compliance of damaged material is obtained from the Gibbs free energy function. The damage evolution is determined from microcrack propagation condition. The proposed model is applied to two brittle rocks. Comparison between test data and numerical simulations shows that the proposed model is able to describe main features of mechanical behaviors observed in brittle geomaterials under compressive stresses.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 103-108 |
| Number of pages | 6 |
| Journal | Key Engineering Materials |
| Issue number | 180 PART 1 |
| State | Published - 2000 |
| Externally published | Yes |
Funding
This work was performed during the visit of J.F. Shao to Northwestern University, Department of Civil Engineering from May to August 1999. The financial and scientific support provided by Northwestern University is greatly acknowledged. Partial financial support was provided by the US Department of Energy, Office of Basic Energy Sciences, Geosciences Research Program through Grant No. DE-FG02-93ER 14344/09 to Northwestern University. We are grateful to Wolfgang Wawersik for providing data on Tennessee marble from experiments at Sandia National Laboratories, Albuquerque, NM. The experimental data of the granite were obtained in the framework of the French research project ‘GDR-FORPRO-Géomécanique’ which was supported by the CNRS and ANDRA. This support is also greatly acknowledged. In this section, the procedure for the determination of model parameters is first presented. Then the proposed model is applied to describe the behavior of two typical brittle rocks: a French granite and the Tennessee marble. The French granite was investigated in the framework of the jointed research project ‘GDR-FORPRO’ supported by the CNRS and ANDRA. The purpose was to study influences of induced damage in safety analysis of underground storage of radioactive wastes. Laboratory investigations have shown important microcrack induced anisotropic damage in this material. On the other hand, inelastic behaviors related to microcrack growth and induced anisotropy in Tennessee marble have been investigated by Olsson (1995), Rudnicki and Chau (1996), Rudnicki et al. (1996) .
Keywords
- Anisotropy
- Brittle Rock
- Damage
- Microcrack
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Mechanical Engineering