01/07/1996 · PII:S0886-7798 (96)00026-0 Road Tunnels in Japan: Deterioration and Countermeasures Akira Inokuma and Shigero Inano Abstract--Recently, some road tunnels have been deteriorating in Japan. The deterioration rakes several forms, for example, cracking, collapse, etc. Generally it is thought that force on a tunnel lining or decay of lining concrete