Determination of a friction angle for an alkaline igneous rock

CIM Bulletin, Vol. 72, No. 809, 1979

JOHN E. UDD and RIMAS PAKALNIS, Associate Professor and Former Student, Department of Mining and Metallurgical Engineering, McGill University, Montreal, Quebec

The stability of a rock mass is influenced by the presence of discontinuities. In assessing stability, it is required that one should know the frictional and cohesive properties of these contained weaknesses.In the study performed by the authors, a number of samples of diamond drill core containing open discontinuities were tested in shear. The results obtained were compared with values which resulted from back analyses of instabilities in the field.
Keywords: Rock mechanics, Friction angles, Drill samples, Slope design, Discontinuities, Shear strength, Alkaline rocks.