Barton - Bandis
The Barton-Bandis shear strength failure criterion for the rock mass takes the following form:
where: | JRC | - | joint roughness coefficient |
σn | - | normal stress acting on the surface of the rock joint | |
JCS | - | joint compressive strength | |
φb | - | basic angle of internal friction of the slip surface |
If possible the shear strength parameters should be determined from in-situ measurements. Approximate ranges of parameters of the Barton-Bandis failure criterion are given here.