ANISOTROPIC BEHAVIOR OF OTTAWA SAND IN COMPARISON WITH GLASS SPHERES

概要

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Laboratory experiments were conducted on an assemblage of glass spheres and on Ottawa sand to evaluate the effect of fabric on stress-strain behavior, volume change, and the maximum dynamic shear modulus. Series of tests on hollow cylindical specimens were performed by a torsional simple shear/resonant column apparatus. After specimens were prepared by the dry tamping method and saturated, they were first isotropically consolidated, and then sheared along different stress paths while keeping the mean effective stress constant. The test results showed that for specimens of both materials, depositional fabric had a slight influence on the stress-strain behavior, and one half-cycle of preshearing created a clear anisotropy on the stress-strain response. In comparisons of the two types of specimens, Ottawa sand showed a slightly stronger depositional fabric effect but was more difficult to induce fabric as a result of preshearing. In general, both materials showed very similar behavior and it may be concluded that the assemblage of glass spheres can be effectively used in studying state and evolution of fabric of this type of granular materials.
社団法人地盤工学会の論文
1991-03-15