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Road TunnelTunnel ConstructionSoft GroundTunnel Boring MachineTunnel LiningHard RockRail TunnelTunnel Boringthe Channel TunnelConcrete LiningLong TunnelConstruction MethodsTunnel ProjectSprayed ConcreteJoint VentureTunnel ExcavationPipe JackingSegmental LiningCompressed AirUnderground Construction