ABSTRACT
There are approximately 11,000 road tunnels in Japan. As with bridges, the majority of them were constructed during the period of rapid economic growth, in other words, tunnels reaching 30–50 in-service years are increasing. Road tunnels, by aging progresses, there is an increasing risk of an accident. In 2010, an accident to collapse the ceiling plate to be installed in Sasago road tunnel has occurred. This triggered the law to oblige the inspection of road tunnels. Based on the deterioration state and management system of the infrastructure in Japan, JSCE, as a third party institution, has also decided to assess the soundness of the current infrastructure. This paper describes the discussion that JSCE independently assesses the health status of the road tunnels and its management system using inspection data of the road tunnels.
