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Abstract: Crossover tunnel in Metro Line-3 of Mumbai is a sequentially excavated (SEM) 103m long tunnel in volcanic breccia rock with 180m2 excavation area which accommodates 6.35m O.D. twin tube TBM tunnels. Due to schedule constraints during the construction, the JV had decided to complete the TBM tunnels prior to Crossover tunnel construction which requires demolishing of previously constructed...
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...