Representative model to simulate general rock behavior (stiffer and stronger than other types of soil). Hoek-Brown model is isotropic linear elastic behavior and Generalized Hoek-Brown is to link the empirical criterion to geological observations by means of one of the available rock mass classification schemes. All geological index was subsequently extended for weak rock masses. This model is also applicable for Strength Reduction Method (slope stability analysis).

<Failure surface in principle stress plane>

The main nonlinear parameters of the Generalized Hoek-Brown criterion are as follows.

Refer to following Geological Index (Hoek, 1999)

[Uniaxial Compressive Strength]

[Intact Rock Parameter]

[Geological Strength Index (GSI)]

[Guideline for estimating Disturbance Factor (D), 0~1]

[Engineering example for material verification (Slope Stability Analysis)]