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Abstract: Mount Ovit Tunnel Ovit Dağı Tüneli), is a highwayunder construction through Mount Ovit which is 2600 m in height and 12.6 km in length. Initially the project faced many problems caused by highly unstable portal batters, and fault zones with high water inflows and difficult rock conditions. Macro synthetic fiber reinforced shotcrete FRS lining was considered to use instead of steel mesh to...