The ARMR Classification System and the Modified Hoek-Brown Failure Criterion Compared to Directional Shear Strength Models for Anisotropic Rock Masses

  • Neil Bar ORCID
    Affiliation

    Gecko Geotechnics Pty Ltd, P. O. Box 14226, QLD 4868, Cairns, Australia

  • Charalampos Saroglou
    Affiliation

    School of Civil Engineering, National Technical University of Athens, Zografou, 15773 Athens, Greece

Abstract

The anisotropic rock mass rating classification system, ARMR, has been developed in conjunction with the Modified Hoek-Brown failure to deal with varying shear strength with respect to the orientation and degree of anisotropy within an anisotropic rock mass. Conventionally, ubiquitous-joint or directional shear strength models have assumed a general rock mass strength, typically estimated using the Hoek-Brown failure criterion, and applied a directional weakness in a given orientation depending on the anisotropic nature of the rock mass. Shear strength of the directional weakness is typically estimated using the Barton-Bandis failure criterion, or on occasion, the Mohr-Coulomb failure criteria. Directional shear strength models such as these often formed the basis of continuum models for slopes and underground excavations in anisotropic rock masses. This paper compares ARMR and the Modified Hoek-Brown failure criterion to the conventional directional shear strength models using a case study from Western Australia.

Keywords: rock mass classification, slope stability, anisotropy, heterogeneous ground conditions
Published online
2019-12-11
How to Cite
Bar, N., Saroglou, C. “The ARMR Classification System and the Modified Hoek-Brown Failure Criterion Compared to Directional Shear Strength Models for Anisotropic Rock Masses”, Periodica Polytechnica Civil Engineering, 64(1), pp. 14-19, 2020. https://doi.org/10.3311/PPci.14767
Section
Research Article