Tunnels Archives - Crossrail Learning Legacy

Tunnelling induced strains and deformations at Central Line

In October and November 2012, Imperial College installed electrical resistance strain gauge rosettes, potentiometric displacement transducers and tape extensometer eye bolts at selected locations in the Central Line eastbound running tunnel between Lancaster Gate and Marble Arch. The installations w [...]

In Situ Stress Strain Measurements at Tottenham Court Road Platform Tunnel

The redevelopment of Tottenham Court Road Underground Station started in 2011 as part of the Tube Upgrade Plan to improve and increase the capacity of the existing facility. The plan is to upgrade the station by 2016 to meet an estimated demand of more than 200,000 journeys per day once Crossrail is [...]

Lessons learnt from the installation of field instrumentation to monitor ground response to tunnelling

Imperial College in collaboration with Crossrail are performing field monitoring research to investigate the effect of tunnelling in London Clay. This is part of an EPSRC-funded research project investigating how tunnelling affects existing tunnels with segmental cast iron linings. The field researc [...]

Stepney Green Cavern – Design Concepts and Performance of SCL Lining

Crossrail includes several kilometres of SCL tunnels which were designed by Contract C121, Mott MacDonald supported by Gall Zeidler Consultants. The largest of these SCL tunnels are Stepney Green turnout caverns designed to allow trains from Maidenhead in the west to travel to Shenfield and Woolwich [...]

Design and Construction of Crossrail Stepney Green Sprayed Concrete Lined Caverns

At over 50m long, 17m wide and 14m high the Stepney Green Caverns are the largest caverns ever built using Sprayed Concrete Lining techniques in Central London. This paper describes the design, construction and monitoring of the Primary Sprayed Concrete Lining together with lessons learnt that can b [...]

Design of Sprayed Concrete Linings in Soft Ground─ A Crossrail Perspective

Sprayed concrete lined (SCL) tunnelling has seen rapid development over the last twenty years in the UK. The purpose of this paper is to give an update on the latest design philosophies and methodologies, and to discuss the future development trends for SCL tunnelling in soft ground. The paper wi [...]

Delivering a Safe Integrated SCL Design: The Challenges and Successes of Crossrail Contract C300/C410

The design delivery for the sprayed concrete linings (SCL) for Crossrail contract C300/C410 Western Running Tunnels and Station Caverns has involved a unique set of circumstances. The SCL primary lining was designed to withstand the various temporary conditions and also formed part of the composi [...]

Stabilisation of soil pillar adjacent to Eastern Ticket Hall at Bond Street Crossrail Station

Sprayed concrete lining (SCL) tunnelling alongside the secant pile walls forming the Eastern Ticket Hall (ETH) box at Bond Street station left a narrow pillar of clay, less than 1m wide in places, between the piles and the tunnel lining. Since the tunnelling was to occur after excavation of the box, [...]

Design of Crossrail’s Precast Tunnel Linings for Fire

This paper describes the approach taken to design Crossrail’s precast concrete running tunnel linings for structural stability during a severe fire incident. In recent decades there have been a number of fire incidents in road and rail tunnels which have caused severe damage to the lining struc [...]

Data management, analysis and visualisation on Crossrail Drive X Western Tunnels

Crossrail Drive X Western Tunnels extend from Westbourne Park to Farringdon Station. With the TBM and SCL contracts working under the most expensive real estate in the world, the safeguarding of assets is paramount for safety and stakeholder’s assurance. The management of instrumentation data from [...]

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