COMPARING THE EFFECTS OF FLUID SCALING ONLIQUEFACTION IN GEOTECHNICAL CENTRIFUGE

In modeling of dynamic problems such as liquefaction in centrifuge, there are still manydiscrepancies in viscosity scaling among researchers due to the amount of effect of this scaling onother parameters like subsidence and dissipation and difficulties of model preparation. This paper aimsto shed light on the necessity of scaling the viscosity in centrifuge physical modeling, especially inproblems related to earthquakes, permeability, and subsidence. In this study, two tests were conductedon saturated model ground with water and viscous fluid-saturated (Carboxy methylcellulose and waterwhich had ۴۰ times more viscous than water) conditions. In addition, two shakes were imposed oneach model for assessing the after-shake impacts on re-liquefaction and subsidence. According to theresults, using water as a saturating fluid (CMC) can cause about ۳۵% more subsidence in ۱st shakedue to the diluted fluid which leads to inaccurate outcomes. In addition, the evident difference in thedissipation rate of pore pressure can lead to imprecise outcomes in diverse issues such asre-liquefaction.

Keywords:

Centrifuge , Model Test , Liquefaction , Viscosity