An Improved Method for Estimating the Strength of Jointed Rock Mass Using Drilling Technology

Table 2

Comparison of various correlation among the rock mass classification [4].

Researchers	Correlation	Estimated parameter
Bieniawski [54]		RMR from Q
Rutledge and Preston [69]		RMR from Q
Moreno [70]		RMR from Q
Cameron-Clarke and Budavari [71]		RMR from Q
Abad et al. [72]		RMR from Q
Kaiser and Gale [73]		RMR from Q
Al-Harthi [74]		RMR from Q
Barton [75]		RMR from Q
Tugrul [76]		RMR from Q
Kumar et al. [77]		RMR from Q
		RMR from RMi
		RMi from Q
		RMi from Q