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Dilatancy Characteristic and Anisotropy of Sand
under Monotonic and Cyclic Loading
Masaya Hinokio, Teruo Nakai, Takuya Hoshikawa and
Hideo Yoshida
ABSTRACT : To examine the factors
affecting the strength and deformation characteristics of sand, we
performed various triaxial tests under drained and undrained conditions.
In monotonic loading tests, we consider the effects of different density
and shearing from different stress ratios on the strength and
deformation characteristics. In cyclic loading tests, the effects of
different amplitudes of stress ratio and its position on the stress
ratio plane are investigated. Next, to investigate the history
dependency of stress-strain characteristics, monotonic shearing from the
same stress and strain states are performed on sand samples, which were
previous undergone various cyclic stress history. Also, undrained
behavior is compared with drained behavior.
From the results of these tests, it is observed that the stress-dilatancy
characteristic of sand changes with density and cyclic loading
anisotropy develops with plastic deformation, but it cannot be linked
with plastic strains. To explain anisotropy, plastic deformation
processes must be taken into account. It is observed that the drained
and undrained behaviors are closely related and can be explained
consistently.Key words: anisotropy, density, dilatancy,
sand, shear strength (IGC: D6)
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