High Performance Fiber Reinforced Concrete Lining for Road and Railway Galleries

Galleries are common measures to protect roads and railways from rock fall. Rock fall is one of the most relevant natural hazards in the mountainous regions. Accelerated and cost effective construction methodologies for gallery lining have attracted a growing attention in recent years. Sequential construction such as excavation, primary support, reinforcement, formwork, concreting has made limitations for decreasing the execution time. Available methodologies to accelerate the construction will require the elimination or merging of some of these steps. An innovative construction technology has been presented in this paper which reduces the reinforcements, omits the formwork and reduce the construction volumes by utilizing the appropriate properties of macro synthetic fibers, steel reinforcement and wet shotcrete. The design can also utilize the bearing capacities of primary support and create a composite single shell for load carrying. The procedure for analysis, design and construction of the support has been discussed in the paper. All materials including special distributed latticed panels, steels and fiber shotcrete were selected so as to satisfy the durability criteria. The lining can be used for different applications including metro tunnels, road tunnels and sewerage and waterways. The general design concept of these structures is based on the application of a static equivalent force. This approach is simple in use for the engineers in practice, however, the dynamic behavior of the structure is not satisfyingly taken into consideration

Keywords:

High Performance Concrete , Fiber Reinforced Shotcrete , Lattice Panel , Accelerated Construction