ABSTRACT
Civil engineering infrastructures in Japan were intensively developed from the 1960s to the 1970s, thus there is a concern that rapid growth of aging will progress in the future. Therefore, it is necessary to evaluate the health status of each civil engineering infrastructure and to develop the method for evaluating the order of importance for maintenance based on the result of investigation. Various methods of health evaluation have been proposed on the lining of road tunnels. One of them is the Tunnel-lining Crack Index (TCI) proposed by one of the authors, which makes it possible to quantitatively evaluate the status of crack distribution on a tunnel lining. In this paper, TCI was applied to multiple road tunnels managed by Yamaguchi local prefecture. From the time-history of TCI, the crack progression and the priority of tunnel inspection were analyzed to improve the efficiency of maintenance in the future.
