STRENGTH CHARACTERISTICS OF COMPACTED SOIL WITH PARTICULAR REFERENCE TO SOIL STRUCTURE AND ANISOTROPY

Abstract

In this paper, the effects of compaction method on deformation and strength properties of a
sandy soil were examined by means of triaxial and unconfined compression tests and bender element test. A
X-ray CT scan was also employed for providing us with image of structure of two sandy soils (n.b., sample A
and B). The undrained shear strength and dilatancy characteristics were seemingly affected by the
compaction method employed, and also the aspect depended on the soil type. The Ghh/Gvh -value of sample A
was larger than that of sample B. The result would mean that the Ghh/Gvh -value reflecting soil anisotropy is
strongly related to the shear strength and dilatancy characteristics. In addition, the variation of d and Dc of
the statically compacted specimens is more significant than that of the dynamically compacted specimens.
These variations in terms of d and Dc may also affect the deformation and strength characteristics.