Research Article
Classification Method and Application of Rock Fracture Ability by Supercritical CO2 Blasting
Table 2
Numerical scales of factor contribution.
| | Fracture ability grade | Rock mass density (g·cm−3) | Tensile strength (MPa) | Wave impedance of rock (×106 kg·m−2·s−1) | Intactness index of rock mass | Fracturing description |
| | Grade I | <2.5 | <8.0 | <5.0 | <0.05 | Extremely easy to fracture | | Grade II | 2.5～2.8 | 8.0～13.0 | 5.0～8.0 | 0.05～0.35 | Easy to fracture | | Grade III | 2.8～3.1 | 13.0～18.0 | 8.0～12.0 | 0.35～0.55 | Medium | | Grade IV | 3.1～3.4 | 18.0～23.0 | 12.0～15.0 | 0.55～0.75 | Hard to fracture | | Grade V | >3.4 | >23.0 | >15.0 | >0.75 | Extremely hard to fracture |
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