The Crossrail project in London comprises twin TBM driven railway tunnels. The scheme includes several short cross link tunnels between the TBM drives to house switch gear, sumps and for access.
Two adjacent deep shafts in east London involved excavation to 30m below standing groundwater level and required temporary control of pressures in the Lower Aquifer below the London Clay.
This paper describes the development and implementation of an inclined sub-surface ejector well scheme which was used to target and depressurise the channel sands.
This paper describes the construction of an 8.2m diameter by 37.5m deep shaft. The shaft is part of the Crossrail works in central London, and is fonned of precast concrete segments.
The paper describes the ground investigation and discusses how the design accommodated the ground conditions to allow the tunnel and approach structures to be safely and efficiently constructed.
Installation of a new 6km services pipeline under the Humber Estuary required the construction of a launch pit and a reception shaft for the TBM drive each side of the estuary.
This paper describes ground conditions and difficulties encountered in constructing deep excavations in highly permeable fluvioglacial gravels in Cork city, southern Ireland.
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