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SUMMARY:Long-term basement heave in over-consolidated clay\, or how to des
 ign an underground station using a time machine - Deryck Chan\, CUED
DTSTART:20200723T150000Z
DTEND:20200723T154500Z
UID:TALK149950@talks.cam.ac.uk
CONTACT:Magdalena Charytoniuk
DESCRIPTION:The Earth is a giant sponge. This is particularly noticeable w
 hen underground spaces are constructed in places with stiff clay\, like Lo
 ndon 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 the
 se movements often continue for many years after the end of construction\,
  causing significant conservatism in design. This seminar will present a s
 eries of physical experiments of basement heave that used the technique of
  geotechnical centrifuge modelling to reduce the size of the model and spe
 ed 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 i
 n London\, to discern the mechanisms of heave and propose improvements to 
 the methods of basement structure design.\n\nVenue: Google Meet - https://
 meet.google.com/tdf-zivs-chk\n
LOCATION:Delivered online via Google Meet
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