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List of products by author: A. St.John
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Delivering a Safe Integrated SCL Design: The Challenges and Successes of Crossrail Contract C300/C410
Abstract: The SCL primary lining was designed to withstand the various temporary conditions and also formed part of the composite permanent works design. Retaining design responsibility for the composite SCL primary and secondary lining design with one party (Mott MacDonald (MM)), whilst ensuring that the Contractor retained responsibility for excavation and temporary support...
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Geotechnical Risk Management for Sprayed Concrete Lining Tunnels in Farringdon Crossrail Station
Abstract: The proposed Crossrail station will comprise two ticket halls, two escalator/concourse tunnels, two platform tunnels, numerous cross passages and ventilation tunnels. All station tunnels are constructed using sprayed concrete lining (SCL) techniques. The geological conditions were the principal challenge for the design and construction of the Farringdon station tunnels, excavated mainly within...
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Stabilisation of soil pillar adjacent to Eastern Ticket Hall at Bond Street Crossrail Station
Abstract: Sprayed concrete lining (SCL) tunnelling alongside the secant pile walls forming the Eastern Ticket Hall (ETH) box at Bond Street station left a narrow pillar of clay, less than 1m wide in places, between the piles and the tunnel lining. Since the tunnelling was to occur after excavation of the box, the stability of this soil pillar during excavation was identified as a concern. This paper...
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Use of TBM pilots for large diameter SCL caverns: Crossrail C300/C410
Abstract: Crossrail is Europe’s largest construction project, and will transform rail transport in London, increasing capacity by 10%, supporting regeneration and cutting journey times across the city. The Crossrail route will run over 100km from Maidenhead and Heathrow in the west, through new tunnels under central London to Shenfield and Abbey Wood in the east. There will be 38 Crossrail stations...
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