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  Project study of tunnels with time-dependent behaviour - Records of planning and construction

  Recently, the maintenance of the aging infrastructures has become a more serious social issue in Japan. It would be ideal if the social aging infrastructure could be to be repaired and maintained in an efficient manner. The authors selected a pair of the road tunnels as the study area in order to develop estimation methods for tunnels with time-dependent behaviour of the rock around the tunnel. The initial tunnel was constructed between 1972 and 1977, and few years later of use the tunnel’s road base and lining concrete were much damaged due to time-dependent behaviour. The other tunnel was constructed by NATM and completed in March 2014. This paper describes the historical records of the planning, investigation, construction and countermeasures for these two road tunnels focussing on the time-dependent behaviour.

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