This paper presents a review of recent developmentsmade by the authors into the modelling of rock joints in directshear. Careful observation of laboratory direct shear testing onconcrete/rock joints containing two-dimensional roughness hasallowed theoretical models of behaviour to be developed. Theprocesses modelled include asperity sliding, asperity shearing,post-peak behaviour, asperity deformation and distribution ofstresses on the joint interface. Model predictions compareextremely well with laboratory test restults. These models werethen applied to direct shear tests on rock/rock joints, and althoughbehaviour in general was well predicted, the strength of rock/rockjoints was over-predicted. Direct shear tests have also been carriedout on samples containing both two- and three-dimensionalroughness to test the accuracy of the two-dimensionalapproximation to roughness adopted in the theoretical models.
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