This recorded presentation describes Crossrail’s experience of GBRs from the client’s perspective. It covers why Crossrail adopted GBRs, where they were adopted and summarises how they were adopted.
A semi quantitative assessment of the performance of the GBRs is then presented along with an analysis of the types of encounter that gave rise to successful compensation events.
The presentation closes with a subjective view on whether the GBRs were a success and some thoughts on who is best placed to write them.
This talk and Q&A session accompanies a learning legacy technical paper on the same subject.
John was seconded to the Chief Engineers Group within Crossrail from Geotechnical Consulting Group LLP from 2009 until July 2016.
Within the Chief Engineers Group John was responsible for all Crossrail geotechnical matters east of Farringdon. Whilst at Crossrail John was also closely involved with the production of Geotechnical Baseline Reports for all the major Civils contracts. Prior to Crossrail John spent 20+ years as a geotechnical designer working on a diverse range of structures across the world, these included deep basements, embankments, tunnels, slopes and retaining walls. John was seconded to London Underground for a couple of years in the mid 90’s where he led a research programme on the impact of rising groundwater on the tube network.
Mike is the Head of Geotechnics within Crossrail’s Chief Engineer’s Group. Mike’s role is to provide technical and professional leadership for all geotechnical aspects for the tunnelling and civil engineering sub-surface infrastructure work. He has been on the Crossrail Project since 1993 and has been involved in all stages of development of Crossrail from feasibility design, through the Parliamentary Bill process, ground investigations, civil design and construction. Prior to joining Crossrail, Mike worked in the oil and gas industry in the North Sea, the Channel Tunnel, the A27 Brighton & Hove Bypass and the Jubilee Line Extension.