Long-term basement heave in over-consolidated clay, or how to design an underground station using a time machine

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• Deryck Chan, CUED
• Thursday 23 July 2020, 16:00-16:45
• Delivered online via Google Meet.

If you have a question about this talk, please contact Magdalena Charytoniuk.

The seminar will be delivered online via Google Meet platform. To join, please click on the link below on Thursday, 23rd July 2020 at 4:00 pm BST

The Earth is a giant sponge. This is particularly noticeable when underground spaces are constructed in places with stiff clay, like London and Cambridge. When a large basement is excavated in stiff clay, the removal of soil overburden causes the remaining soil to swell slowly and push the new basement upwards, in a phenomenon known as “long-term heave”. The underlying stress-strain relationships are highly non-linear and these movements often continue for many years after the end of construction, causing significant conservatism in design. This seminar will present a series of physical experiments of basement heave that used the technique of geotechnical centrifuge modelling to reduce the size of the model and speed up the process of heave while preserving the mechanisms of deformation. The experimental results will be compared with finite element simulations of the same prototypes and with 21 years of monitoring data from a site in London, to discern the mechanisms of heave and propose improvements to the methods of basement structure design.

Venue: Google Meet – https://meet.google.com/tdf-zivs-chk

This talk is part of the Engineering Department Geotechnical Research Seminars series.

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