000022057 001__ 22057
000022057 005__ 20170622145954.0
000022057 04107 $$aeng
000022057 046__ $$k2015-05-25
000022057 100__ $$aZhang, Zitao
000022057 24500 $$aEXAMINING THE INITIATION MECHANISMS OF STATIC AND DYNAMIC LIQUEFACTION USING THREE DIMENSIONAL DEM SIMULATIONS

000022057 24630 $$n5.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000022057 260__ $$bNational Technical University of Athens, 2015
000022057 506__ $$arestricted
000022057 520__ $$2eng$$aStatic and dynamic liquefaction may produce different levels of damages on the infrastructures and various numbers of casualties. Understanding the associated initiation mechanisms therefore is very important for geotechnical engineers to predict and manage the relevant hazards. In this study, a series of DEM simulations of undrained triaxial compression tests and a cyclic undrained triaxial test are carried out to examine the initiation mechanisms from a micromechanical perspective. The simulation results demonstrate a continuous decrease in the mean of contact normal forces and a continuous increase in the associated COV as the shear strain increases during undrained compression of a loose sample. Such kind of evolution trend found in the contact force distribution was not observed in the simulations of undrained compression tests on medium dense to dense sand samples. However, the same behavior can be detected in the cyclic undrained triaxial tests on a dense sample, i.e., a continuous decrease in the mean of contact normal forces and a continuous increase in the associated COV. Hence, such an evolution tendency of contact force distributions can serve as a basis to explain the initiation mechanisms of the static and dynamic liquefaction from a micromechanical point of view.

000022057 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022057 653__ $$aStatic Liquefaction, Cyclic Loading, Contact Force Distribution, Discrete Element Method.

000022057 7112_ $$aCOMPDYN 2015 - 5th International Thematic Conference$$cCrete (GR)$$d2015-05-25 / 2015-05-27$$gCOMPDYN2015
000022057 720__ $$aZhang, Zitao$$iWang, Yu-Hsing
000022057 8560_ $$ffischerc@itam.cas.cz
000022057 8564_ $$s4960357$$uhttps://invenio.itam.cas.cz/record/22057/files/C1094.pdf$$yOriginal version of the author's contribution as presented on CD, section: 
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000022057 962__ $$r22030
000022057 980__ $$aPAPER