Table 7 Excavation classification system proposed by Abdullatif and Cruden7.
From: Re-evaluation of excavation class limits for underground excavations based on new data
Limits | Excavatability class |
|---|---|
RMR > 60 Q > 3.20 | Blasting |
30 < RMR < 60 1.05 < Q < 5.20 | Ripping |
RMR < 30 Q < 0.14 | Digging |
