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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...
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...