Parameter | Description | Value |
RQD | 40 - 50 | 40 - 45 |
Jn | Three joint sets with random to four joint sets | 12 |
Jr | Smooth to planar | 1 |
Ja | Softening or low friction clay mineral coatings | 4 |
Jw | Dry to medium inflow of pressure | 1 - 0.66 |
SRF | Medium stress, favorable stress condition | 1 |
Q | 0.62 - 0.83 | |
Class No. | Very poor rock |