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Drift Filled Hollows (‘scours’, ‘pingos’) are small to very large Quaternary ground features. They can extend deep into bedrock geology and are infilled with disturbed, metastable, superficial deposits and highly weathered bedrock. They present major risks to tunnelling and construction projects, yet predicting their location is extremely difficult.
This presentation will explain the ground model and ground risk analysis developed for the 6.9km Lee Tunnel drive in east London. We will show how the Slurry TBM coped with a potentially catastrophic encounter with one of the largest of these features at over 50m below ground level. We will detail the urgent measures taken following this encounter, the behaviour of the crucial Northern Outfall Sewer, look at lessons learned, how DFH’s are formed, and how these features may be predicted in the future.
Please note that advance booking is not required, and the event is free of charge to attend.
Geotechnical Engineer, Jacobs
Site Manager, Morgan Sindall
Senior Partner, Geotechnical Consulting Group
e: [email protected]