ABSTRACT
Those tunnels coming to be older, they represent now an important topic in the tunneling field especially in Europe, were the matter of inspection, maintenance and repair adopts an ever increasing degree of importance (Richards, 1998). The tunnels’ owners need a performing system qualifying and evaluating their state, which is essential for maintenance optimization. Therefore, most usual diagnosis methods are qualitative and focus the surveying operations on superficial lining information, without studying each structure component separately and then their interaction. In consequence, they input limited quality information for maintenance decision.
