Abstract
The constant mi is a fundamental parameter required for the Hoek-Brown (HB) criterion to estimate the strength of rock materials. To calculate mi values, triaxial tests need to be carried out; however, triaxial tests are time-consuming and expensive. In this research, a simplified method is proposed that can estimate mi values using information on rock types and the uniaxial compressive strength (UCS) of intact rocks. To evaluate the reliability of the proposed method, mi values estimated from the proposed method are used in the HB criterion to predict intact rock strength. The predicted intact rock strength is then tested against experimental intact rock strength using existing triaxial tests and tests in the authors’ laboratory. Results from the comparison show that mi values calculated from the proposed method can be used reliably in the HB criterion for estimating intact rock strength when triaxial test data are not available.
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