Twin-tube road tunnel under the River Thames, 2 x 1,400 m long,
internal diameter 10.66 m, external diameter 11.45 m
Access ramps, 600 m in length
8 cross-passages
Service buildings at both tunnel portals
1 new footbridge
1 new overbridge for the southbound carriageway of the Blackwall Tunnel
Construction method:
TBM tunnelling using an EPB TBM, 2 x 1,120 m
TBM diameter 11.8 m,
Twith steel fibre reinforced segmental lining,
Construction of cross-passages using ground freezing and sprayed concrete lining including rebar reinforded concrete secondary lining, 300 m cut and cover tunnel
Geology
London Clay, dense sands of the Lambeth Group, dense gravels of the Harwich Formation, River Terrace Deposits
General data
Project Silvertown Tunnel, London, United Kingdom
Client
Transport for London (TfL), London, United Kingdom
Contractor
Wayss & Freytag Ingenieurbau AG in a Joint Venture