Hoek-Brown
Hoek-Brown
The Hoek-Brown strength criterion in Slide2 refers to the ORIGINAL Hoek-Brown failure criterion [ Hoek & Bray (1981) ], described by the following equation:
This is a special case of the Generalized Hoek-Brown criterion, with the constant a = 0.5. See below for definition of the parameters in this equation.
The original Hoek-Brown criterion has been found to work well for most rocks of good to reasonable quality in which the rock mass strength is controlled by tightly interlocking angular rock pieces.
For lesser quality rock masses, the Generalized Hoek-Brown criterion can be used.
Generalized Hoek-Brown
The Generalized Hoek-Brown strength criterion is described by the following equation:
where:
is the uniaxial compressive strength (UCS) of the intact rock pieces
See the Generalized Hoek-Brown topic for more information.