Development of a damage-based constitutive model for brittle rocks

A. Mortazavi, H. Molladavoodi

Research output: Contribution to conferencePaperpeer-review


The dominant causes of irreversible rock deformations are damage process and plastic flow. Most of the existing elastic-plastic models employed in the analysis and design of rock structures only consider the plastic flow and ignore the full damage process. Therefore, developments of realistic damage models are essential in the design process of rock structures. In this paper, the basic concepts of continuum damage mechanics are outlined and a clear definition of the damage resistance function and its hardening and softening laws are established. Since quasi brittle materials such as rock degrade under shear microcracking (mode ∏), separate positive and negative damage yield functions are introduced. The proposed damage yield functions are formulated in the framework of a damage model which was coded in C++ environment and implemented into the commercial code UDEC. Accordingly, the developed algorithm was applied to the simulation of brittle rocks behavior. The uniaxial compressive and tensile testing of a brittle rock was simulated numerically and numerical findings were compared against experimental data. The analysis results show a very good match between numerical and experimental data especially in the post-elastic region.

Original languageEnglish
Publication statusPublished - Dec 1 2010
Externally publishedYes
Event44th US Rock Mechanics Symposium and the 5th US/Canada Rock Mechanics Symposium - Salt Lake City, UT, United States
Duration: Jun 27 2010Jun 30 2010


Conference44th US Rock Mechanics Symposium and the 5th US/Canada Rock Mechanics Symposium
CountryUnited States
CitySalt Lake City, UT

ASJC Scopus subject areas

  • Geology
  • Geotechnical Engineering and Engineering Geology

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