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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