Prediction of shear behaviour of joints using profiles |
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| Authors: | G Swan S Zongqi |
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| Institution: | (1) Canmet, Elliot Lake, Ontario, Canada;(2) Central-South Institute of Mining and Metallurgy, Changsha, China |
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| Abstract: | Summary The 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. |
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