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SUMMARY:Seismic behaviour pile foundations in improved and unimproved soft
  clays - Professor K.K. “Muralee” Muraleetharan\, Kimmell-Bernard Chai
 r in Engineering\, David Ross Boyd and Presidential Professor\, School of 
 Civil Engineering and Environmental Science\, University of Oklahoma
DTSTART:20130319T140000Z
DTEND:20130319T150000Z
UID:TALK43761@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:Pile foundations are integral part of many civil engineering s
 tructures and pile foundations are routinely constructed in soft clays. Th
 e seismic behavior of pile foundations is a very complex problem with inte
 ractions between soils (solid skeleton\, pore water\, and pore air)\, pile
 s\, and superstructure. This complexity is further increased when weak soi
 ls such as soft clays surround the pile foundation. Seismic behavior of pi
 le foundations in soft clays may be improved using ground improvement tech
 niques such as Cement Deep Soil Mixing (CDSM). The seismic behavior of pil
 e foundations in improved ground is\, however\, poorly understood. \n\nA f
 ully coupled finite element computer code\, TeraDysac\, and centrifuge mod
 el tests are used to study the influence of CDSM ground improvement around
  pile foundations in saturated soft clays during earthquakes. TeraDysac co
 nsiders the coupled differential equations governing the behavior of the s
 olid skeleton\, pore water\, and piles. Bounding surface elastoplastic con
 stitutive models are used to simulate the stress-strain behavior of soils 
 in TeraDysac. This presentation will first detail the theory and computati
 onal aspects behind the computer code TeraDysac and then present TeraDysac
  simulations of centrifuge model tests involving pile foundations in unimp
 roved and CDSM improved soft clays. The prototype of the centrifuge models
  consisted of 10 m of soft clay underlain by 8 m of dense sand with single
  piles and pile groups and various extents of CDSM ground improvement arou
 nd the piles. Centrifuge model tests and TeraDysac simulations show that w
 hile lateral stiffness of piles and pile groups in improved soil always in
 creases\, the seismic behavior of pile foundations is complicated and depe
 nds on the extent of the ground improvement around the piles.  \n
LOCATION:Schofield Centre
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