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  HS2 is going to use steel fibres for the rail tunnel lining segments

  High Speed Two is a new high-speed railway linking up London, the Midlands and the North, serving eight of Britain’s 10 largest cities. In the Phase One, the high-speed trains will travel between London and Birmingham on 134 miles of dedicated track, Phase 2a will run from the West Midlands to Crewe and Phase 2b route forms a Y shape, split into an eastern and a western leg. The first phase of HS2 between London and Birmingham is composed by three areas. The area South is then divided in S1, Euston Tunnels and Approaches, and S2, Northolt Tunnels. The Central area is splited in C1, Chiltern Tunnels and Colne Valley Viaduct, C2, North Portal Chiltern Tunnels to Brackley, and C3, Brackley to South Portal of Long Itchington Wood Green Tunnel. The area North is then divided in N1, Long Itchington Wood Green Tunnel to Delta Junction and Birmingham Spur, and N2, Delta Junction to WCML Tie-In. Five Bored Tunnels are planned: Euston Tunnel, Northolt Tunnel, Chiltern Tunnels, Long Itchington Tunnel and Bromford Tunnel, all will be twin tubes. Ultra-high strength steel wire fibres will reinforce the tunnel lining segments, Model Code 2010 and EN 14651 are adopted for design and testing. A massive experimental investigation had been carried out to validate the formula of the steel fibre-reinforced concrete (SFRC).

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