Effect of Anisotropy on Compression, Strength and Permeability Properties of Clayey Soil
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Abstract
Anisotropy on compression, strength and permeability of a clayey soil selected from Mosul
city was studied in this paper. Laboratory standard tests were conducted on sets of duplicate
disturbed and undisturbed specimens prepared in the vertical, 45º inclined and horizontal directions
from block samples retrieved from the site. The one dimensional consolidation of the clayey soil was
shown to be cross-anisotropic for the vertical and horizontal directions, the 45º inclined showed an
intermediate results. Drainage occurred more rapidly in the horizontal direction comparing with 45º
inclined and vertical directions, with horizontal to vertical permeability ratio (rkh) not less than (2.0) for
disturbed and undisturbed specimens from both consolidation and permeability tests. Compression at
higher effective stresses caused significant reductions in the coefficient of consolidation (cv) and
permeability (k) although the rk values remained independent of the stress level. Furthermore the
clayey soil specimens were noticeably anicotropic in strength, where the relationship between
stresses and strains for vertical, 45º inclined and horizontal directions exhibited consistently dissimilar
peak values as well as deformations at various strain levels.
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