Experimental and numerical assessment of fabric anisotropy using multi-orientation shear wave velocity measurements.


The soil fabric is made up of the arrangement of soil particles and inter-particle interactions, which impacts the behavior of granular soils and can lead to anisotropic soil characteristics and behavior. This paper provides the results of an experimental and numerical investigation aimed at developing an indirect method to measure the fabric of coarse-grained soils using multi-orientation measurements of shear wave velocity, Vs. Vs measurements are obtained on specimens prepared with varying degrees of fabric and stress anisotropy. The results indicate that the changes in contact fabric affect the stiffness anisotropy as shown by the angular distribution of measured Vs. Results during K0 compression highlight the stress anisotropy, with maximum Vs aligning with the major principal stress direction. Isotropic compression results highlight the effect of particle shape orientation, where the maximum Vs aligns with the direction with long axis orientation. The ability to measure Vs experimentally and numerically is shown to provide an indirect estimation of contact fabric and link the physical and numerical modeling of coarse-grained soils.

In Proceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2021