Research Article

Engineering Geological Assessment of Diversion Tunnel of Bakhtiari Damsite (Biggest Two-Arch Concrete Dam in Southern Iran)

Table 11

Estimation of the rock-support systems for the upper diversion tunnel based on -support chart [10].

Rock masses of different geological units ProposedRockSupport
untensioned rock
bolt (fully grouted)
ShotcreteSteel Rib

SV2143 m rock bolts at 2.4 m spacingSystematic boltingNo need
SV3153 m rock bolts at 2.4 m spacingSystematic boltingNo need
SV3 Dis113 m rock bolts at 2.3 m spacingSystematic bolting with 40 mm unreinforced shotcreteNo need
SV2 and SV3103 m rock bolts at 2.3 m spacingSystematic bolting with 40 mm unreinforced shotcreteNo need
SV4153 m rock bolts at 2.4 m spacingSystematic bolting No need
SV5353 m rock bolts at 3 m spacingSpot bolting
SV6143 m rock bolts at 2.4 m spacingSystematic bolting No need
SV5 and SV6 Dis113 m rock bolts at 2.3 m spacingSystematic bolting with 40 mm unreinforced shotcreteNo need
SV7123 m rock bolts at 2.3 m spacingSystematic bolting with 40 mm unreinforced shotcreteNo need
F2 fault zone103 m rock bolts at 2.3 m spacingSystematic bolting with 40 mm unreinforced shotcreteNo need