Case Study - Deep Foundations

Crossrail C511 Whitechapel Station, UK

PROJECT SUMMARY

NAME: C511 Whitechapel Station

Advance Works Piling & Diaphragm Wall - Durward Street shaft YEAR: Autumn-Winter 2011

CLIENT: Crossrail

MAIN CONTRACTOR: BAM Nuttall/Kier JV

CONSULTANT: Ove Arup & Partners Int Ltd

OVERVIEW MONITORING PRODUCTS USED Crossrail will deliver a high frequency, Due to the close proximity of existing Borehole extensometer high-capacity service to 37 stations buildings and the London Overground, The Geosense® GEO-XB rod type linking Maidenhead and Heathrow in extensive monitoring is required under extensometer range used to measure the west, to Shenfield and Abbey Wood Crossrail document CR-STD-303-11 and locate settlement, displacement in the east via 21 km of new twin-bore Instrumentation & Monitoring. and deformation in soil around the tunnels under central London. It will excavation. Monitoring is required as part of Asset bring an additional 1.5 million people Protection as well as design validation within 45 minutes commuting distance Inclinometer casing and construction safety. of London’s key business districts. Used in combination with the portable As part of the first phase of monitoring vertical inclinometer. Advanced station works are currently a series of borehole rod extensometers being carried out for the Whitechapel and inclinometers have been installed Portable MEMS inclinometer Station as part of the Crossrail project. prior to the diaphragm guide walls Used to measure lateral displacement of The advanced works for the shaft in being installed. ground. Durward Street involves installing a Future instrumentation to be installed diaphragm wall in a very confined area includes In-place inclinometers, VW VW 2106 readout located over the London Overground, piezometers, VW strain gauges and a Measures all types of vibrating wire. next to Swanlea School. data logging system.

Geosense Ltd, Nova House, Rougham Industrial Estate, Rougham, Bury St Edmunds, Suffolk IP30 9ND, England www.geosense.co.uk e [email protected] t +44(0)1359 270457 V1.3 01/2021