ABSTRACT
A significant financial investment is required to construct, operate and maintain tunnels and therefore, a systematic inspection procedure in place is imperative to effectively evaluate the condition of the lining during their operation. Thus, a proper maintenance schedule can be followed preventing unexpected repairs and keeping costs down. This paper presents the implemented procedure for the concrete lining visual inspection of “Ionia Odos” highway tunnels in Western Greece. It provides a systematic approach to visually evaluate the structural integrity and record issues needing to be addressed during operational life of the tunnels. Furthermore, a case study from the first structural visual inspection of these tunnels is presented. Initial findings from the implemented procedures along with aspects of structural issues and operational challenges that occurred during the inspection are outlined in detail.
