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Crossrail 2

Client
Service Performed
Provide SCL project services, supporting main tunnel-stations-alignment workstreams, design of tunnel cross sections, SCL design principles, geotechnical review and risk assessment.
Commencement - Services
January 01, 2015
Location
22 Carlisle Place
London
SW1P1JA
United Kingdom
Geology description

The geology is expected to be highly variable crossing most of the typical units of the London basin (river terrace deposits, London Clay, Lambeth Group, Thanet Sand).

Geology types
Description

Crossrail 2 is a proposed new rail infrastructure project, aiming to alleviate further crowding and congestion across London. The proposed central route will provide a link between Wimbledon in the South and New Southgate and Tottenham Hale in the North with a provision for an Eastern branch towards Hackney Central. It will provide interchange with multiple London underground, London Overground, Crossrail 1, national and international rail services. It is expected to increase significantly the capacity of the regional rail network and reduce the journey times supporting the population growth of the City of London.

Activity
Construction methods
Tunneling under
Building, Rail, Road
Proposed route according to public consultation autumn 2015
Crossrail 2 in numbers (www.crossrail2.co.uk)
Project number
476C
Final cost
£30 billion GBP
Completion date
Ongoing

Crossrail Farringdon Station - Geotechnical Assessment

Service Performed
Temporary works design included design of tunnels prior to ring closure and 28 day strength as well as depressurisation design.
Commencement - Services
May 01, 2013
Completion - Services
October 01, 2015
Location
Cnr Charterhouse St & Farringdon Rd
London
EC1M3HN
United Kingdom
Geology description

Excavation encountered almost all the London basin units but mainly Lambeth Group, comprising stiff to very stiff overconsolidated clays to water bearing sand units.

Geology types
Description

The station is located in central London between Tottenham Court Road and Liverpool Street Crossrail (CRL) Stations. Constructed in the geologically most complex area in the whole of CRL, an optimised geotechnical and SCL tunnel design was implemented, which resulted in significant time and cost benefits for the project. Using a dynamic 3D geological model in conjunction with SCL tunnelling represented a key element of the geotechnical risk management framework.

Activity
Service areas
Construction methods
Special Construction techniques
Tunneling under
Building, Rail, Road
Groundwater control
Max Overburden
25 m
Max Excavation Area (m2)
95
Tunnel length
1000 m
Qualitative geotechnical risk mapping
Exerpt of the 3D finite element model
Project number
222D5
Min Overburden
5 m
Final cost
£300 million GBP

Bond Street Station Upgrade Design

Service Performed
Design of the primary and secondary sprayed concrete linings, 3D FE modelling of all SCL tunnels including excavation steps and ground movement assessments.
Commencement - Services
January 01, 2011
Completion - Services
January 01, 2013
Location
Oxford Street
London
W1C 2HU
United Kingdom
Geology description

The tunnel horizon is generally within the London Clay formation with the lowest tunnels sitting in the Lambeth Group, where clay layers and water bearing clayey sands are inter-changing.

Geology types
Description

Bond Street tube station is a major gateway to London's West End served by both the Central and Jubilee lines. As part of the LU tube upgrade plan, the station is undergoing a major upgrade to increase capacity, improve accessibility and create interchange with the new Crossrail station. The project provides two additional escalators from the interchange level to the Jubilee line, low-level interchange route between the Central and Jubilee lines, a new step-free entrance, ticket hall and new lifts. The majority of the tunnelling works will be mechanically excavated and lined with sprayed concrete.

Activity
Final cost
$150,000,000
Construction methods
Tunneling under
Max Excavation Area (m2)
15-90m2
Tunnel length
370m
3D view of proposed tunnelling and existing infrastructure
Connection chamber one
Graphic  showing split of 3D FE models
3D Graphic showing construction site and building frame used for laydown/plant
Northern Tunnels in relation to Jubilee Line platforms and Post Office Tunnel
Binocular Tunnel at Jubilee Platform level
Project number
419D1
Final cost
£150 million GBP

Crossrail Farringdon Station Execution

Service Performed
Tunnel design, engineering support, geotechnical engineering and site supervision services were provided.
Commencement - Services
March 01, 2013
Completion - Services
November 01, 2015
Location
39 Cowcross Street
London
EC1M 6BY
United Kingdom
Technical data

Located in the heart of Crossrail, Farringdon is one of London’s major rail interchange stations, providing connections between three networks (Thameslink, Crossrail and London Underground). Dr. Sauer & Partners provided 24/7 supervision support during the SCL works.

Geology description

The majority of the tunnelling takes place within the Lambeth Group formations.

Geology types
Description

Farringdon station is now one of London's major rail interchange stations, providing connections between three networks. During the construction of the Crossrail project, it also received four earth pressure balanced tunnel boring machines (TBMs): the two Drive X TBMs, running from Royal Oak to Farringdon and the two Drive Y TBMs, running from Limmo to Farringdon. The complete station layout will comprise two ticket halls, two platform tunnels, connecting cross passages, escape and ventilation adits, two escalator - inclines and two concourse tunnels constructed using mainly SCL tunnelling.

Activity
Bid cost
$300,000,000
Final cost
$400,000,000
Construction methods
Special Construction techniques
Tunneling under
Max Excavation Area (m2)
25-110m2
Tunnel length
1000m
Western ticket hall site overview
Cross passage 3 from platform tunnel east
Platform Tunnel West - RTE2 excavation - TBM Turn and Bury
Western Ticket Hall Site Overview I
Platform Tunnel West - TBM Tunnel Enlargement
Project number
222E5
Final cost
£400 million GBP

Crossrail Farringdon Station Design

Service Performed
Design of the primary sprayed concrete linings and excavation stability including depressurisation/dewatering. 3D FE modelling of all SCL tunnels including excavation steps.
Commencement - Services
April 01, 2012
Completion - Services
October 01, 2015
Location
39 Cowcross Street
London
London
EC1M 6BY
United Kingdom
Technical data

The BFK joint venture was awarded the constrction contract for Farringdon Crossrail station in 2011. BFK appointed Dr. Sauer & Partners as consultants for all sprayed concrete lining (SCL) tunnelling works prior to ring closure. 

Geology description

From the ground surface to the bedrock the geology comprised made ground, river terrace deposits, followed by London Clay, Lambeth Group formation, Thanet Sands and chalk.

Geology types
Description

Farringdon station is situated at the heart of London's rail network and will be one of its major rail interchange stations, which will link Crossrail, Thameslink services and London Underground trains. The station layout includes two ticket halls, two escalator inclines, two platform tunnels, connecting cross passages, concourse tunnels and ventilation adits. The chosen tunnelling system for Farringdon Station was sprayed concrete lining (SCL). The station comprised a total of 1km of SCL tunnels at depths of up to 35m below ground level and excavation cross-sections varying from 25m2 to 110m2.

Activity
Final cost
$400,000,000
Construction methods
Tunneling under
Max Excavation Area (m2)
25-110m2
Tunnel length
1000m
General view of the Crossrail route with focus on Farringdon Station
Western ticket hall and SCL tunnels
CP1 (left), CP1-CH1 connection adit (centre) and PL2RC (right)
Plan view of the station showing the projection of the Faults at tunnel axis level and the Sand lenses
Probing in CP1
Cycle of risk reduction through the implementation of geotechnical risk management tools
Project number
222D5
Final cost
£400 million GBP