Precast Steel Fibre Reinforced Concrete Segmental Lining For Metro Tunnels

Precast concrete segmental linings in metro tunnels have been traditionally perceived and designed using conventional steel rebars. While technically and practically proven for years with satisfactory results, there exist issues specific to segmental lining tunnels which perhaps could be still addressed in a better manner in such a system. In this paper, a new system of reinforcing precast segments with steel fibres as primary reinforcement is introduced. The advantages of using steel fibres vis-à-vis traditional reinforcement are discussed, along with guidelines to select the correct fibre types and dosages to ascertain the performance of fibres.