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  Stabilisation of soil pillar adjacent to Eastern Ticket Hall at Bond Street Crossrail Station

  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 describes this identification and modelling of the ground stability risk, and also the selection and design process that was employed in the development of a detailed temporary works scheme to mitigate that risk. The difficulties associated with the implementation of that design in a highly constrained location are also discussed.

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