Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 50, Issue 2, Pages 341-352Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-016-1083-0
Keywords
Failure criterion; Micromechanics; Damage and friction coupling; Unilateral effects; Penny-shaped cracks; Brittle rocks
Funding
- National Natural Science Foundation of China [11202063, 51679068]
- Fundamental Research Funds for the Central Universities [2014B06914, 2016B20214]
- 111 Project [B13024]
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A proper criterion describing when material fails is essential for deep understanding and constitutive modeling of rock damage and failure by microcracking. Physically, such a criterion should be the global effect of local mechanical response and microstructure evolution inside the material. This paper aims at deriving a new mechanisms-based failure criterion for brittle rocks, based on micromechanical unilateral damage-friction coupling analyses rather than on the basic results from the classical linear elastic fracture mechanics. The failure functions respectively describing three failure modes (purely tensile mode, tensile-shear mode as well as compressive-shear mode) are achieved in a unified upscaling framework and illustrated in the Mohr plane and also in the plane of principal stresses. The strength envelope is proved to be continuous and smooth with a compressive to tensile strength ratio dependent on material properties. Comparisons with experimental data are finally carried out. By this work, we also provide a theoretical evidence on the hybrid failure and the smooth transition from tensile failure to compressive-shear failure.
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