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SUMMARY:Floatation of Underground Structures in Liquefiable Soils - Darren
  Chian\, CUED
DTSTART:20110610T150000Z
DTEND:20110610T160000Z
UID:TALK30542@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Underground infrastructure has been a widespread alternative i
 n redeveloping urban spaces to ease congestion pressure arising from land 
 scarcity. It has often served as vital lifelines for transport\, utility a
 nd storage purposes. They include subway train and highway tunnels\, gas\,
  electrical\, water and sewage pipelines. However\, in the event of an ear
 thquake\, the functionality of these lifelines could be put into jeopardy 
 especially in soils susceptible to liquefaction.\n\nHistorically and recen
 t earthquake events have proven the floatation susceptibility of undergrou
 nd structures. Such structures passing through liquefiable soil deposits a
 re susceptible to floatation due to their lower\nunit weight as compared t
 o the surrounding saturated soil. Centrifuge test results will be presente
 d to describe the soil-structure interaction involved in floating tunnels 
 and pipes in liquefied soil deposits. \n\n\nThe influence of the 1)mass\, 
 2)buried depth\, and 3)diameter of the structure\, as well as the 4)type\,
  5)relative density\, 6)permeability of the sand will be covered in the pr
 esentation. The soil deformation around the soil would also be illustrated
  with the use of PIV analysis. A simplified mechanism of the floatation wi
 ll be shown and applied to predict uplift displacement of buoyant structur
 es. \n\n\n
LOCATION:Engineering Department - Lecture Room 6
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