Long-term application of Geomechanical classification (Bieniawski 1973) and Q-system (Barton et al. 1974) in Croatia has resulted in a database related predominantly to carbonate and clastic rock masses. On the basis of the classification of 461 geological situations during exploration works and tunnel construction, the relationship between classifications has been analyzed. For the purpose of deter-mining constants m and s at the Hoek-Brown failure criterion, the GSI and Q' correlations for carbonate and clastic rock masses have been analyzed.

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