Abstract
The macro-scale response of wet particulate media reflects a wealth of microscale particle-fluid interaction processes, both in fine-grained and in coarse grained materials. Four phenomena are documented: changes in stiffness and attenuation due to partial saturation, chemico-mechanical coupling, static and dynamic electro-mechanical coupling, and stiffness transient. Experimental studies are conducted in a resonant column, an axi-symmetric cell, and oedometric chambers. The interpretation of these phenomena is based on micro-scale concepts.