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Tableau 2
Facteur de masse (Hobbs, 1974).
Rock mass factor (Hobbs, 1974).
| RQD (%) | Velocity index VF2/VL2 | Mass factor j |
|---|---|---|
| 0–25 | 0–0,2 | 0,2 |
| 25–50 | 0,2–0,4 | 0,2 |
| 50–75 | 0,4–0,6 | 0,2–0,5 |
| 75–90 | 0,6–0,8 | 0,5–0,8 |
| 90–100 | 0,8–1,0 | 0,8–1,0 |
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