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The Barton-Bandis strength model can be used to model the shear strength of a joint. The Barton-Bandis strength model establishes the shear strength of a failure plane as:

Barton-Bandis Strength Model Equation

where Residual Friction Angle Symbol is the residual friction angle of the failure surface [Barton and Choubey, 1977],

JRC is the joint roughness coefficient, and JCS is the joint wall compressive strength.

For further information on the shear strength of discontinuities, including a discussion of the Barton-Bandis failure criterion parameters, see Chapter 4 of Practical Rock Engineering by Dr. Evert Hoek, available on the Rocscience website.

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