A Study of an Anisotropically Overconsolidated Silt by the Resonant Column Method

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Courtesy of ASTM International

This paper presents the results of a study of the anisotropic characteristics of the shear modulus and damping ratio of a remolded silt that has been uniaxially consolidated. Resonant column tests were conducted on specimens trimmed vertically and horizontally from bulk samples previously subjected to various uniaxial preconsolidation pressures. The tests were performed under various confining pressures, hence resulting in a range of overconsolidation ratios. The degree of anisotropy was defined as the percent difference between the shear modulus of the vertically trimmed specimens and the horizontally trimmed specimens. Empirical relations were found to represent the degree of anisotropy as functions of the overconsolidation ratio and the effective confining pressure.

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