Evolution of small strain stiffness of granular soils with a large number of small loading cycles in the 3-D multiaxial stress space

Alessandro Mandolini, Andrea Diambra, Erdin Ibraim

Abstract

The effect of the application of a large number of small loading cycles on the small strain stiffness of granular soils has been explored in the generalized multiaxial stress space using the Hollow Cylinder Torsional Apparatus (HCTA). The experimental investigation has been carried out on an angular to sub-angular silica sand. The sequence of cyclic loading has been performed for a range of stress levels and orientation of the principal stress axes. Accurate measurements of the quasi-elastic properties of the material were obtained using six non-contact dis placement transducer (based on eddy current effect) with a resolution of 0.1 µm. Vertical, circumferential and radial strains of the sample could be accurately measured to obtain accurate estimation of Young and Shear moduli at very small strain levels. Changes in both moduli under a sequence of both axial and torque loading cycles will be presented for different initial multiaxial stress conditions.

Keywords

Small Strain Stiffness, Granular Soils, Hollow Cylinder Torsional Apparatus, Cyclic Loading, Multi-Axial Stress Conditions

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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