Multi-aquifer pressure relief in east London

Crossrail is a major new east-west rail link through central London. The twin 6.2m diameter running tunnels under central London were driven by TBMs from the west and east to meet at Farringdon. This paper is concerned with the dewatering and pressure relief measures required for the eastern drive and auxiliary shafts located at Limmo peninsula between the Isle of Dogs and the Royal Docks, Figure 1. The site is bounded by the tidal waters of Bow Creek to the west, Canning Town Station to the east (Jubilee Line and Docklands Light Railway) and by the Lower Lea Crossing (road bridge) to the south. The location was chosen to facilitate material delivery and muck-away for the TBM drives by river.