RMR scenario | Rating | Entry width | Bolt length | Bolt spacing (SF = 1.7) | Numbers of bolts per row |
RMRB | 43 | 5.50 m | 1.60 m | 0.90 m | 6 |
RMRretro. | 68 | 5.50 m | 1.00 m | 1.20 m | 5 |