Prediction of shear behaviour of joints using profiles

SummaryThe nature of roughness scale effects and the limited use of simple regular profiles are discussed. Some details of the empirical Barton-Bandis and Ladanyi-Archambault models are critically reviewed. It is shown that true roughness amplitude exhibits an increasing magnitude with scale in contrast to the Barton-Bandis model.Generalized relationships between stress, displacement, and compliance are developed for a joint at the commencement of sliding. the relationships are derived using a new fundamental approach based upon profilometry, Hertzian contact theory and the laws of friction. Predictions for an interlocked slate joint and a mismatched granite joint agree well with experiment. An as yet unconfirmed nominal scale effect upon shear compliance is predicted, the latter increasing with joint area.

[1]  J. C. Jaeger,et al.  Fundamentals of rock mechanics , 1969 .

[2]  C. M. Gerrard,et al.  JOINT COMPLIANCES AS A BASIS FOR ROCK MASS PROPERTIES AND THE DESIGN OF SUPPORTS , 1982 .

[3]  D. Cruden,et al.  ESTIMATING JOINT ROUGHNESS COEFFICIENTS , 1979 .

[4]  Norbert R. Morgenstern,et al.  THE ULTIMATE FRICTIONAL RESISTANCE OF ROCK DISCONTINUITIES , 1979 .

[5]  G. Swan,et al.  Determination of stiffness and other joint properties from roughness measurements , 1983 .

[6]  H. K. Chiu,et al.  PREDICTION OF SHEAR BEHAVIOUR OF JOINTS USING PROFILES , 1981 .

[7]  D. F. Coates,et al.  Deformability of joints and its relation to rock foundation settlements , 1978 .

[8]  N. Barton,et al.  The shear strength of rock joints in theory and practice , 1977 .

[9]  N. Suh,et al.  The genesis of friction , 1981 .

[10]  R. S. Rosso.  A comparison of joint stiffness measurements in direct shear, triaxial compression, and In Situ , 1976 .

[11]  J. Greenwood,et al.  The Contact of Two Nominally Flat Rough Surfaces , 1970 .

[12]  Mechanisms of elastic contact and friction between rough surfaces , 1978 .

[13]  F. P. Bowden,et al.  The Friction and Lubrication of Solids , 1964 .

[14]  N. Rengers,et al.  INFLUENCE OF SURFACE ROUGHNESS ON THE FRICTION PROPERTIES OF ROCK PLANES , 1970 .

[15]  Nick Barton,et al.  Experimental studies of scale effects on the shear behaviour of rock joints , 1981 .

[16]  N. Lundborg,et al.  Strength of rock-like materials , 1968 .

[17]  Nick Barton,et al.  Some effects of scale on the shear strength of joints , 1980 .