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

Table 7

Theoretical RQD values (%) 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	11.50	13.69	42.03	73.71	83.08	89.69	99.21
20	High	14.03	17.32	57.59	77.05	86.87	99.25	99.52
10	Medium	14.76	17.66	58.23	79.87	95.16	99.55	99.55
3	Low	16.04	18.78	58.42	92.07	99.45	99.55	99.55
1	Very low	16.94	20.34	82.39	99.45	99.55	99.55	99.55