This paper describes issues related to stiffness of unsaturated particulate materials including the effects of time-varying processes during the formation and disruption of the menisci during loading and their effect in the matric suction. The phenomena are studied using a true triaxial device with matric suction control and equipped with bender elements for shear-wave velocity measurements. Evidence shows that the low-strain and high-strain stiffness of the particulate media are stress- and suction-controlled. However at high strains the stiffness that results from the effect of matric suction is lost and its re-stiffening rate depends on the moisture content.

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