ABSTRACT
The final lining of the emergency tunnel consists of a sandwich structure with two layers of sprayed concrete with an impermeable sprayable membrane between the two concrete layers. The membrane bonds to both the substrate steelfibre reinforced sprayed concrete (primary rock support) as well as the sprayed concrete layer (unreinforced) which covers
ABSTRACT: An innovative method for the waterproofing of tunnels was employed for the 4 m diameter bored tunnel, an emergency escape facility for the recently completed Giswil highway tunnel in central Switzerland.
