Farringdon station SCL Design – Reducing risk at the heart of Crossrail

Farringdon Station consists of approximately 1 km of tunnels to be constructed using a “Sprayed Concrete Lining” (SCL). The tunnel layout comprises a network of subterranean platform tunnels, connecting cross passages, concourse tunnels, escalator inclines and ventilation adits (see figure 1). The tunnel excavation diameters vary from approximately 6m to 11m and will be constructed at depths of up to 35m below ground surface beneath a congested area of central London that forms a major transport hub and employment centre for thousands of commuters. Impacts from tunnelling on these activities could be serious and potentially affect two London Underground lines, Thameslink services and Smithfield Market.