References | Equations | Maximum value of UCS (MPa) |
D’Andrea et al. (1964) [1] | UCS = 15.3 PLS + 16.3 | 350 |
Broch and Franklin (1972) [2] | UCS = 23.7 PLS | 250 |
Bieniawski (1974; 1975) [3] [4] | UCS = 23 PLS | 350 |
Brook (1977; 1980) [5] [6] | UCS = 12.5 PLS | 300 |
Hassani et al. (1980) [7] | UCS = 29 PLS | 200 |
ISRM Commission (1985) [8] ; Brook (1985) [9] | UCS = 20∙∙∙25 PLS | 250 |
Hikita and Kikuchi (1988) [10] | UCS = 12.3∙∙∙15.0 PLS | 200 |
Kahraman (2001) [11] | UCS = 23.62 PLS − 2.69 | 150 |
Kahraman (2001) [11] | UCS = 8.41 PLS + 9.51 | 150 |