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Crossrail Farringdon Station - Geotechnical Assessment
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| Service: | Temporary works design included design of tunnels prior to ring closure and 28 day strength as well as depressurisation design.
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| Estimated cost: | Commencement: | May 01, 2013
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Completion date: | October 01, 2015
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| Location: | Cnr Charterhouse St & Farringdon Rd London EC1M3HN |
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| 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. |
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| Bid cost: | Final cost: | £300 million GBP
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| Overburden: | 25 m
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| Excavation area: | 95
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| Tunnel length: | 1000 m
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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.
