Effects of Mineral Composition on Dynamic Properties of Dry Sands

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Rodriguez, Ricardo
Aggour, Mohammed S
The effects of mineral composition on the dynamic properties of dry sands, mainly the shear modulus and damping, are not well determined. Due to the vast geologic diversity, knowledge of the effects of mineral composition on dynamic properties can be very beneficial since it can have a direct effect on the site’s seismic response analysis. To understand these effects, a series of dynamic tests using a Drnevich Resonant Column device were performed on various sand samples with different mineral compositions. Sands were selected and classified based on their respective ranking in the Mohs scale of hardness. All sand samples were engineered to have the same gradation properties. Resonant column tests were performed at various confining pressures in order to assess each sand’s shear modulus and damping ratio as a function of strain. Tests results show that the mineral composition has a large effect on both the shear modulus and damping. It was concluded that testing soils during the site characterization process should be emphasized.