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A modified Hoek–Brown failure criterion for anisotropic intact rock

This paper was the first to introduce anisotropy into the Hoek-Brown failure criterion to allow prediction of the strength of anisotropic rocks. It has been adopted and applied internationally (e.g. http://dx.doi.org/10.1007/s10064-013-0472-9) and was crucial for research on the behaviour of anisotropic rock masses in tunneling (http://dx.doi.org/10.1016/j.enggeo.2012.05.001). It is ideally suited for application by the shale gas industry for the prediction of fracture propagation during hydro-fracturing. Awarded the “Theocharis” Prize in Mechanics by the Academy of Athens (2009) and the Richard Wolters Prize from IAEG (2012). Presented as an invited lecture by Saroglou at the IAEG International Conference, Beijing-2013 (iaegst@163.com).