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  Shotcrete Reinforced with Polypropylene Fibers for Tunnelling Lining

  Considering cities random growth and the increasing need for infrastructures, the underground have been becoming a better option to fullfill most of civil engineering needs. Nowadays, underground constructions, and more specifically those classified as tunnels, are executed through completely diversified construction techniques. Most of them are based on shotcrete lining in order to both improve the short-term structure lift and increase worker’s safty all along the construction period. The sprayed concrete, composed of small aggregates, is directly projected through a pressurized pipe on a smooth surface. It is worth pointing out that not of all rock masses need coating, but, in case of less resistent ones, it is recommended to use sprayed concrete lining. For a better structural performance, the sprayed concrete is reinforced with fibers. The polypropylene fiber presents great benefits when it comes to crack propagation control and fire resistance. With laboratory tests and bibliographical support, this work aimed to analyze the behavior of polypropylene fiber reinforced shotcrete under both compression and tension stresses. It was concluded that the polypropylene fiber was satifactory to resist fire propagation in a tunnel but the results showed that the fiber had a bad performance in resisting compressive and tensile stresses.Tunnel; Shotcrete; Polypropylene fiber; Lining; Compression; Tensile stress.

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