A failure criterion for transversely isotropic rocks

In this paper, a new failure criterion for the transversely isotropic rocks is presented. The new criterion is based on two distinct failure modes; on e is the sliding mode where the failure is caused by sliding along the disc ontinuity, and the other is the non-sliding mode where the failure is contr olled by the rock material and is not dependent on discontinuity. This fail ure criterion is defined with seven material parameters. The physical meani ngs of, and the procedures for determining, these parameters are described. Both the original Jaeger criterion and the extended Jaeger criterion are s hown to be special cases of the proposed criterion. The accuracy and applic ability of the proposed failure criterion are examined using the published experimental data. The data used cover various types of transversely isotro pic rocks, different orientation angels and confining pressures. The predic ted strength behaviors of the transversely isotropic rocks agree well with the experimental data from various investigators. The accuracy and applicab ility of the proposed empirical failure criterion are demonstrated in this paper. (C) 2001 Elsevier Science Ltd. All rights reserved.