Shear Strength, Friction Angle; Joint Roughness Coefficient
Shear force is applied along a shear plane while maintaining a constant normal force to cause shear displacement within an intact rock specimen. The shear force is recorded and used to calculate friction angle. Any specimen orientation can be tested.
3 or 4
In most cases, the least cross-sectional dimension of the specimen should be at least 10 times the largest grain size in the specimen. The test plane should have a minimum area of 1900 mm2 (3 in2). Specimen should fit within 6" diameter shear rings.
Asperity, direct shear strength, discontinuity, displacement, rock, roughness, sliding friction, stress