Research Article
Engineering Geological Assessment of Diversion Tunnel of Bakhtiari Damsite (Biggest Two-Arch Concrete Dam in Southern Iran)
Table 10
Estimation of rock support system for the upper diversion tunnel.
| | Rock masses of different geological units | RMR | Rock-mass class | Proposed Fully grouted rock bolt (20 mm) | Rock Shocrete | Support Steel Rib |
| | SV2 | 75 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | SV3 | 77 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | SV3 Dis | 68 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | SV2 and SV3 | 61 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | SV4 | 80 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | SV5 | 95 | I | Local bolting | No need | No need | | SV6 | 77 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | SV5 and SV6 Dis | 61 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | SV7 | 75 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need | | F2 fault zone | 61 | II | 3 m rock bolts in crown at 2.5 m spacing | 50 mm in crown | No need |
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