Design, manufacturing and installation of fiber reinforced segmental lining in Golab Tunnel

Many studies have been performed on fiber reinforced segmental lining for years, which is to improve some of the weak material properties of Segmental lining. Fiber-added reinforced concrete (FRC) applications have become widespread in areas such as, tunnel shells, concrete sewer pipes, and slabs of large industrial buildings. Usage of FRC in load-carrying members of buildings having conventional reinforced concrete (RC) frames is also gaining popularity recently because of its positive contribution to both energy absorption capacity and concrete strength. The paper is focused on the mechanical properties of the designed structural steel fiber reinforced concrete (SFRC), which are important for the capacity of the tunnel lining segments and their damage during manipulation. Generally the segments are more loaded during tunnel lining installation (long term load is lower). The realized investigation was focused on SFRC with various types of fibers, such as steel fiber and synthetic fiber. The use of fiber reinforced concrete for the Golab tunnel segments was examined, but for the highly loaded big rings with high bending moments and normal forces, a high amount of bar reinforcement is necessary