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

Table 1

Parameters to consider for the different classification systems [37].

Classification systems	RMR	Q	GSI	RMI
Parameters	UCS	Joint set number	UCS	UCS
	RQD	RQD	Surface condition	Block volume
	Joint spacing	Joint roughness	Structure/interlocking of rock blocks	Joint roughness
	Joint condition	Joint alternation		Joint alternation
	Ground water condition	Joint water reduction factor		Joint size and termination
		Stress reduction factor
Adjustment parameters	Joint orientation