The nonlinear Hoek–Brown criterion for rock masses is widely accepted and has been applied in many projects around the world. The strength and deformation properties of intact rock, derived from laboratory tests, are reduced based on the properties of discontinuities in the rock mass. The criterion now incorporates both intact rock and discontinuities, such as joints, characterized by the geological strength index (GSI), into a system designed to estimate the mechanical behaviour of typical rock masses encountered in tunnels, slopes and foundations. Users should refer to the original published version of the material for the full abstract.The Hoek–Brown criterion was introduced in 1980 to provide input for the design of underground excavations in rock. No warranty is given about the accuracy of the copy. However, users may print, download, or email articles for individual use.
Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. This method is applied to an actual rock mass around a tunnel in the Hanjiang to Weihe River Project of China. The corresponding errors are within a range of 15%. The strengths predicted by the proposed method for limestone, granite, slate, and sandstone are in good agreement with those measured during laboratory tests. The single model parameter used in the new model controls the residual strength nonlinearity. A novel method based on the H–B failure criterion is established to predict the residual strength of rock. In addition, previously proposed methods of estimating the residual strength of rock are reviewed. A practical approach is proposed to determine the value of the parameter mi. A correlation between the contact friction coefficient and mi is established using published data. In this paper, a new perspective is presented for the physical meaning of the parameter mi of the H–B model in consideration of the contact friction coefficient. Triaxial tests for the calculation of this constant are time-consuming and expensive. Abstract: The constant mi is a fundamental parameter required in the Hoek–Brown (H–B) failure criterion for estimating rock strength.
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