Brittle Failure of Rock: A Review and General Linear Criterion
Joseph Labuz
Civil, Environmental, and Geo- Engineering, University of Minnesota
ABSTRACT: A successful failure criterion is a generalization of experimental data obtained from strength tests. For isotropic rock that exhibits a pressure dependence on strength, the simplest failure criterion is a linear equation in major and minor principal stresses. A general linear failure criterion called Paul-Mohr-Coulomb (PMC) includes the intermediate principal stress and provides a framework to describe a nonlinear failure surface by a set of planes “hugging” the curved surface. In this presentation, Labuz explains PMC and illustrates fitting strength data with two planes to form 6- and 12-sided pyramidal failure surfaces.
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