Mechanism of Liquefaction Response in Sand-Silt Dynamic Centrifuge Tests

Mourad Zeghal *, Ahmed-W. Elgamal * Xiangwu Zeng * and Kandiah Arulmolil *


Dynamically induced liquefaction of saturated medium-dense sand strata overlain by low permeability silt layer is studied in centrifuge tests. Level site and embankment simulations are conducted at Rensselaer Polytechnic Institute (RPI) and the University of California at Davis (UCD). The recorded lateral accelerations are employed to evaluate shear stress and strain histories at various locations within the tested soil-systems. These histories shed light on two-layer sand-silt-system liquefaction characteristics and associated mechanisms of: (1) lateral deformation, (2) stiffness and strength degradation, and (3) sand densification and regain of stiffness.

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