read Working Group 6: Maintenance and Repair
The Maintenance and Repair of Tunnels from an International Point of View Report on the Damaging Effects of Water on Tunnels during their Working Life Civil Engineering Records of Underground Structures State-of-the-art-report of Non-Destructive Testing Methods for Determining the State of Tunnel Lining Guidelines for structural fire resistance for road tunnels (May 2004) Study Methods for Repair of Tunnel Linings