Abstract
Two electrokinetic (EK) techniques are being developed to study wave propagation in consolidated and unconsolidated granular materials. In contrast to the more common acoustical techniques, EK transduction utilizes the electrokinetic coupling between sediment grain surface chemistry and pore fluid motion. When Biot theory is applicable, coupled electrokinetic-Biot theory predicts that a macroscopic electric potential is generated by fluid motion in electrolyte-saturated porous media. (Our previous research on the reciprocal case—of creating a pressure wave by applying a high voltage impulse to electrolyte-saturated sediments—has been presented at recent ASA meetings.) To assess the validity of Biot theory as a model of ocean sediments, various EK measurements were taken in the laboratory. Preliminary data using silica sand, as well as unconsolidated and consolidated (sintered) glass microspheres, will be presented. We will also describe the coupled electrokinetic-Biot theory, the underlying volume-averaged poroelastic model upon which it is based, and related issues in homogenization theory. [Work supported by ONR, Ocean Acoustics.]
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