Sr. No. | RMR values | Q values | Estimated support by RMR | Estimated support by Q |
1 | 41 - 60 | 1 - 4 | Systematic bolts 4.0 m long, 1.5 - 2.0 m spaced in crown and walls with wire mesh in the crown. 50 - 100 mm shotcrete in crown and 30 mm. | Systematic bolting with 40 - 100 mm unreinforced shotcrete. |
2 | 61 - 80 | 4 - 10 | Locally, bolts in crown 3 m long, spaced 2.5 m with occasional wire mesh. Shotcrete 50 mm in crown where required. | Systematic bolting |