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SUMMARY:Characterisation of clean and silty-sands using variable penetrati
 on rate cone testing - Professor Jason DeJong\, Department of Civil and En
 vironmental Engineering\, University of California\, Davis\, CA
DTSTART:20130530T150000Z
DTEND:20130530T163000Z
UID:TALK44558@talks.cam.ac.uk
CONTACT:Anama Lowday
DESCRIPTION:The performance of intermediate soils (e.g. silty sands) durin
 g dynamic earthquake loading is a primary source of uncertainty in the des
 ign of geotechnical systems.  The characterization of intermediate soils i
 s challenging due to complications with obtaining high quality samples for
  laboratory testing and in interpreting soil properties from in situ penet
 rometer measurements obtained when partial drainage conditions exist.  The
  penetration of the cone at different penetration rates enables control of
  drainage conditions\, and therefore has the potential to improve estimati
 on of drained and undrained soil properties.  Cone penetration testing in 
 sands with fines contents up to 35% is explored through drained and undrai
 ned cylindrical cavity expansion simulations with a modified MIT-S1 consti
 tutive model. Stress-normalizations of drained and undrained cone tip resi
 stance are explored in terms of the state parameter. Partial drainage effe
 cts on the state-normalized cone tip resistance – cyclic resistance rati
 os used in liquefaction triggering curves are evaluated. The ratio of drai
 ned to undrained penetration resistance is then explored to evaluate how t
 he ratio changes with stress level and state. The results indicate that so
 il stiffness\, stress-dilatancy\, and limiting compression behaviors are f
 ound to be the primary factors that affect the ratio of drained to undrain
 ed penetration resistance.
LOCATION:Engineering Department - Lecture Room 3A
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