Liquefaction potential of sands under one- and two-dimensional shakings
Date Issued
2005
Date
2005
Author(s)
翁作新
DOI
932625Z002028
Abstract
This project used the large biaxial laminar shear box developed by National Center for
Research on Earthquake Engineering (NCREE) to prepare the large specimens of Vietnam sand
to study the behavior of saturated sand, especially liquefaction, and soil-structure interactions
under two-dimensional earthquake shaking on the shaking table at NCREE. Pore pressures and
accelerations within the soil, and the displacements and accelerations of the frames at various
depths were measured during tests under both one- and multi-directional shakings of sinusoidal
accelerations and earthquake records with various amplitudes. It is found that the excess pore
water pressures generated during a two-dimensional shaking are substantially higher than those
generated under the one-dimensional shaking of the same magnitude of acceleration. The sand at
a shallower depth is more susceptible to liquefaction than the sand at a greater depth. There is
always an upward hydraulic gradient in the sand during shaking regardless of occurrence of
liquefaction. The pore water tends to flow from the deeper soil, even without liquefaction,
towards the shallower soil. The results obtained from the multidirectional shaking tests in this
sub-projects can be used as the basis for corrections for the problem of soil liquefaction and
ground settlement to the existing analyses and design methods which consider only the single-directional shaking.
Subjects
earthquake
sand
shaking table
laminar shear box
liquefaction
pore water pressure
Publisher
臺北市：國立臺灣大學土木工程學系暨研究所
Type
report
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