Classification Method and Application of Rock Fracture Ability by Supercritical CO₂ Blasting

Table 9

Cloud digital characteristics of fracture ability evaluation index.

Fracture ability grade	Rock mass density (g·cm^−3)			Tensile strength (MPa)
	Ex	En	He	Ex	En	He
Grade I	1.25	0.42	0.01	4.00	1.33	0.01
Grade II	2.65	0.05	0.01	10.50	0.83	0.01
Grade III	2.95	0.05	0.01	15.50	0.83	0.01
Grade IV	3.25	0.05	0.01	20.50	0.83	0.01
Grade V	3.40	0.05	0.01	23.00	0.83	0.01
Fracture ability grade	Wave impedance of rock (×10^6 kg·m^−2·s^−1)			Intactness index of rock mass
	Ex	En	He	Ex	En	He
Grade I	2.50	0.83	0.01	0.025	0.008	0.01
Grade II	6.50	0.50	0.01	0.20	0.05	0.01
Grade III	10.00	0.67	0.01	0.45	0.033	0.01
Grade IV	13.50	0.50	0.01	0.65	0.033	0.01
Grade V	15.00	0.50	0.01	0.75	0.033	0.01