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

Table 3

Three-dimensional joint densities of 35 pairs of “persistence-spacing.”

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	0.0398	0.0199	0.0061	0.0020	0.0006	0.0002	0.0001
20	High	0.1592	0.0796	0.0245	0.0080	0.0024	0.0008	0.0005
10	Medium	0.6369	0.3185	0.9799	0.0318	0.0098	0.0032	0.0021
3	Low	7.0771	3.5386	1.0888	0.3539	0.1089	0.0354	0.0236
1	Very low	63.6620	31.8310	9.7942	3.1831	0.9794	0.3183	0.2122