Selection of Optimal Threshold of Generalised Rock Quality Designation Based on Modified Blockiness Index

Table 8

Optimal thresholds of all hypothetical models.

Joint persistence (m)		Joint spacing (m)
		Extremely wide	Very wide	Wide	Moderate	Close	Very close	Extremely close
		0.02	0.04	0.13	0.4	1.3	4	6
40	Very high	200	200	300	500	800	100	100
20	High	100	300	200	200	900	100	100
10	Medium	100	100	100	300	100	100	100
3	Low	100	200	200	300	100	100	100
1	Very low	100	100	100	100	100	100	100