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  A Study on the Criteria for Rehabilitation of Old Mountain Tunnels Considering the Risk on Damages by Big Earthquake

  Of the road tunnels managed in Japan, the proportion of tunnels over 50 years after construction is currently around 20%, but will increase to over 50% in 20 years. In addition, Japan is an earthquake-prone country, and the risk of earthquake occurrence is high. This suddenly decreases the soundness of any tunnel within the influence zone, and there have been reports of cases of large-scale deformation in inside a tunnel due to an earthquake. However, the earthquake damage risk is not currently considered in the countermeasure priority of the tunnel. Therefore, in this study, we will assume tunnel damage in the case of a large earthquake on the active fault in Yamaguchi prefecture. Moreover, we tried to select priority measures for tunnel in Yamaguchi Prefecture, including the soundness and construction method of the current tunnel lining concrete and the emergency roads in Yamaguchi Prefecture.

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