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SUMMARY:The effects of multi-directional loading on soil liquefaction - Me
 ngchen Sun\, CUED
DTSTART:20181115T160000Z
DTEND:20181115T164500Z
UID:TALK114403@talks.cam.ac.uk
CONTACT:Magdalena Charytoniuk
DESCRIPTION:While seismic waves are commonly treated as horizontally polar
 ised\, the earthquake is not limited to only one direction on the horizont
 al plane. This presentation discusses the results of undrained cyclic simp
 le shear tests with multi-directional loading paths. A conical failure env
 elope is hypothesised and validated in the 3D τ-σ’ space. This failure
  cone hypothesis explains the unsolved questions\, including why stress pa
 ths seem not able to reach the failure line in bi-directional linear tests
  and why\, in multi-directional shearing scenarios\, liquefaction can happ
 en without the excess pore pressure ratio reaching the unity. The concept 
 of conical surface\, however\, cannot be transferred conveniently to the p
 hase-transformation states\, where a bi-modal phenomenon is seen. Based on
  the testing data\, discussions are made regarding liquefaction criteria\,
  liquefaction resistance\, the development of excess pore pressure and she
 ar strain\, as well as the degradation of shear modulus in multi-direction
 al loading conditions.
LOCATION: Cambridge University Engineering Department\, Lecture Room 6
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