A new Hoek-Brown-Matsuoka-Nakai failure criterion for rocks

In the current paper, we propose a new three-dimensional strength criterion for rocks expressed in terms of the first principal stress invariant, I1, and the second and third invariants of the deviatoric stress tensor, J2 and J3. The design of this constitutive model conjugates the characteristics of two of the most well-known and widely used criteria in geotechnical engineering: Hoek-Brown and Matsuoka-Nakai. Its material parameters can be calibrated based on conventional axisymmetric compression and extension tests. Experimental polyaxial test data from a dozen different rock types were used to validate the current criterion.

Automated summary

A new three-dimensional strength criterion for rocks is proposed in this paper, which combines the characteristics of two widely used criteria. The material parameters can be calibrated based on experimental data.