Strength Behaviour of Rockmass Containing Coplanar Close Intermittent Joints under Direct Shear Condition

Based on the results of model tests, the deformation and facture mechanisms of brittle rockmass containing coplanar close intermittent joints under direct shear condition were analysed , then the incipient crack strength and communicating destruction criterion of such rockmass were proposed in this paper. It was shown that the computing results suited the real measuring values well by comparing them, which indicated the criterions was reasonable ,reliable and has both the theory and construction significances.