Codalike multiple scattering of elastic waves in dense granular media.
We study the multiple scattering of short-wavelength ultrasound through the force networks in dry and wet glass bead packings under stress. Over long distance scales, the diffusion approximation is shown to describe adequately the transport of elastic waves dominated by shear waves. The recovered transport mean path reveals a short-range correlation of the force chains. Also we observe the drastic effect of wetting liquids on the energy dissipation in the granular medium. The relevance of these experimental findings for the seismological applications is discussed.
Jia
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Laboratoire de Physique des Matériaux Divisés et des Interfaces, Université de Marne-la-Vallée, CNRS UMR 8108, Champs sur Marne, France. jia@univ-mlv.fr