Review of the Geological Strength Index (GSI) as an Empirical Classification and Rock Mass Property Estimation Tool: Origination, Modifications, Applications, and Limitations

Table 3

Comparison of various correlations among the rock mass classifications.

S. no.	Authors	Correlation	Estimated parameter	Reference	Equation no.
1	Hoek and Brown		GSI from RMR79	[61]	(42)
2	Hoek and Brown		GSI from RMR89	[61]	(43)
3	Morales et al.		GSI from RMR89	[94]	(44)
4	Coşar		GSI from RMR89	[95]	(45)
			GSI from Q	[95]	(46)
5	Osgoui and Ünal		GSI from RMR89	[51]	(47)
6	Hashemi et al.		GSI from RMR89	[84]	(48)
			GSI from GSI	[84]	(49)
7	Irvani et al.		GSI from RMR89	[96]	(50)
8	Singh and Tamrakar		GSI from RMR89	[65]	(51)
9	Zhang et al.		GSI from RMR89	[50]	(52)
10	Sadeghi et al.		GSI from RMRBasic	[97]	(53)
			GSI from RMR89		(54)
			GSI from Q		(55)
			GSI from RMi		(56)
			GSI from RSR		(57)
			GSI from RCR		(58)
			GSI from QN		(59)
			GSI from GSICai		(60)