TRANSPORT FOR LONDON RIVER CROSSINGS: SILVERTOWN TUNNEL SUPPORTING TECHNICAL DOCUMENTATION This report is part of a wider SILVERTOWN CROSSING suite of documents which STUDY: TUNNEL outline our approach to traffic, environmental, optioneering ENGINEERING and engineering disciplines, Mott MacDonald amongst others. We would like to know if you have any June 2012 comments on our approach to This report presents the subsequent this work. To give us your studies of both bored tunnel and views, please respond to our immersed tunnel crossings of the consultation at Thames at Silvertown. www.tfl.gov.uk/silvertown- tunnel Please note that consultation on the Silvertown Tunnel is running from October – December 2014 Silvertown Crossing Study Tunnel Engineering June 2012 Transport for London Silvertown298348 MNC CrossingTUN 001 Study A C:\DOCUME~1\tuc06895\OTLocal\PiMS Live \Workbin \592E6A14.0 \Silvertown Crossing Study Rev 001 draft for 16 December 2011 Tunnel Engineering June 2012 Transport for London Windsor House, 42-50 Victoria Street, London SW1H OTL Mott MacDonald, Mott MacDonald House, 8-10 Sydenham Road, Croydon CR0 2EE, United Kingdom T +44(0) 20 8774 2000 F +44 (0) 20 8681 5706, W www.mottmac.com Silvertown Crossing Study Issue and revision record Revision Date Originator Checker Approver Description 001 24/02/2012 N Tucker /J Baber S Allen M Leggett Draft – for comment 002 22/06/2012 N Tucker/J Baber S Allen M Leggett Final - updated for comments This document is issued for the party which commissioned it We accept no responsibility for the consequences of this and for specific purposes connected with the above-captioned document being relied upon by any other party, or being used project only. It should not be relied upon by any other party or for any other purpose, or containing any error or omission which used for any other purpose. is due to an error or omission in data supplied to us by other parties. This document contains confidential information and proprietary intellectual property. It should not be shown to other parties without consent from us and from the party which commissioned it. Mott MacDonald, Mott MacDonald House, 8-10 Sydenham Road, Croydon CR0 2EE, United Kingdom T +44(0) 20 8774 2000 F +44 (0) 20 8681 5706, W www.mottmac.com Silvertown Crossing Study Content Chapter Title Page Executive Summary i 1. Introduction 1 1.1 Background________________________________________________________________________ 1 1.2 Scope of this report__________________________________________________________________ 2 1.2.1 Bored tunnel _______________________________________________________________________ 2 1.2.2 Immersed Tunnel ___________________________________________________________________ 3 1.3 Report structure ____________________________________________________________________ 3 1.4 Contributors _______________________________________________________________________ 3 2. Project Constraints 4 2.1 Greenwich Peninsula Development _____________________________________________________ 4 2.2 London Cable Car (LCC) _____________________________________________________________ 4 2.3 Gas Works Foundations ______________________________________________________________ 5 2.4 River Flood Walls ___________________________________________________________________ 5 2.5 Land Ownership ____________________________________________________________________ 5 2.6 Connections to A102 Blackwall Approach ________________________________________________ 6 2.7 Gas Holder ________________________________________________________________________ 6 2.8 DLR Viaduct _______________________________________________________________________ 6 2.9 DLR Thames Wharf Station ___________________________________________________________ 6 2.10 JLE Future Extension ________________________________________________________________ 6 2.11 Royal Victoria Dock Western Entrance ___________________________________________________ 6 2.12 Royal Victoria Dock Drainage __________________________________________________________ 7 2.13 Land Use__________________________________________________________________________ 7 2.14 Project Location ____________________________________________________________________ 7 3. Geotechnical 9 3.1 General ___________________________________________________________________________ 9 3.1.1 Topography________________________________________________________________________ 9 3.1.2 Regional Geology ___________________________________________________________________ 9 3.1.3 Scour Hollows______________________________________________________________________ 9 3.1.4 Hydrogeology ______________________________________________________________________ 9 3.1.5 Expected Ground Conditions _________________________________________________________ 10 3.1.6 Geological Overview of the Greenwich Peninsula _________________________________________ 12 3.1.7 Geological Overview of the London Borough of Newham Silvertown Area_______________________ 12 3.2 Geotechnical Implications for Bored Tunnel ______________________________________________ 13 3.2.1 TBM Selection & Specification ________________________________________________________ 14 3.2.2 Cross Passages ___________________________________________________________________ 14 3.2.3 Low Point Sump ___________________________________________________________________ 14 3.2.4 Cut and Cover_____________________________________________________________________ 15 3.2.5 Open Cut Ramps __________________________________________________________________ 15 3.3 Geotechnical Implications for Immersed Tube Tunnel ______________________________________ 15 3.3.1 The Dredged Trench________________________________________________________________ 15 3.3.2 Marine Temporary Works ____________________________________________________________ 16 3.3.3 Control of settlements _______________________________________________________________ 16 298348/MNC/TUN/001/B 22/06/2012 C:\DOCUME~1\BAB58876\OTLocal\PIMS LIVE\Workbin\59C11FC7.0\Silvertown Crossing Study Rev 002.doc Silvertown Crossing Study 3.3.4 The Casting Basin__________________________________________________________________ 16 3.3.5 Cut and cover tunnels _______________________________________________________________ 17 3.3.6 Open Cut Ramps __________________________________________________________________ 17 3.3.7 Re-use of materials_________________________________________________________________ 17 4. Bored Tunnel – Design Criteria 18 4.1 General __________________________________________________________________________ 18 4.2 Alignment Development _____________________________________________________________ 18 4.3 Design Criteria ____________________________________________________________________ 19 4.3.1 Design Speed and Stopping Site Distance _______________________________________________ 19 4.3.2 Carriageway Dimensions ____________________________________________________________ 19 4.3.3 Super Elevation____________________________________________________________________ 20 4.3.4 Gradient _________________________________________________________________________ 20 4.4 Tunnel Diameter ___________________________________________________________________ 20 4.5 Minimum Alignment Plan Radius ______________________________________________________ 20 4.6 Minimum Tunnel Crown Cover ________________________________________________________ 20 4.7 Traffic, Equipment and Structure Gauge_________________________________________________ 21 4.7.1 Vertically _________________________________________________________________________ 21 4.7.2 Horizontally _______________________________________________________________________ 21 4.8 Cross Passages ___________________________________________________________________ 21 4.9 Cross Passage Sump _______________________________________________________________ 21 4.10 Tunnel Linings_____________________________________________________________________ 22 4.11 Tunnel Ventilation __________________________________________________________________ 22 5. Bored Tunnel – Environmental Issues 24 5.1 Air Quality ________________________________________________________________________ 24 5.2 Archaeology ______________________________________________________________________ 25 5.3 Biodiversity _______________________________________________________________________ 25 5.4 Ground Contamination ______________________________________________________________ 26 5.4.1 Greenwich________________________________________________________________________ 26 5.4.2 Newham _________________________________________________________________________ 27 5.5 Heritage _________________________________________________________________________ 27 5.6 Landscape & Townscape ____________________________________________________________ 27 5.7 Noise & Vibration __________________________________________________________________ 28 5.8 Waste Management ________________________________________________________________ 29 5.9 Water Resources and Flood Protection _________________________________________________ 30 5.9.1 Surface Water_____________________________________________________________________ 30 5.9.2 Flood Risk________________________________________________________________________ 30 5.9.3 Groundwater ______________________________________________________________________ 31 5.10 Sustainability______________________________________________________________________ 32 6. Bored Tunnel - Fire Life Safety 34 6.1 Introduction _______________________________________________________________________