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Abstract Based on relationship between Poisson′s ratio and angle of internal friction for pure tensile failure，the relationship between Poisson′s ratio and angle of internal friction for pure shear failure is deduced；the shear，brittle shear，plastic shear and tensile failures as well as creep deformation distribution zones are defined by Poisson′s ratio and angle of internal friction. Based on the analysis of test data，the linear boundary lines for tensile shear and shear tensile failures are determined；the semi-empirical formulae of brittle shear failure criteria are established. According to the semi-empirical formulae，Poisson′s ratio and angle of internal friction and shear strength of single rock specimen can be calculated easily；the mesoscopic failure modes of rock can be zoned. By comparing with the results of triaxial compression tests，the mechanisms for different rock failures are explained. The case study demonstrates that it is practical to use the Poisson′s ratio to calculate shear strength of single rock specimen. The classification of rock failure zones can be used in prediction of failure modes and failure types.
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Received: 27 January 2010
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2011, Vol. 30 
