title: Dynamic pore-pressure fluctuations in rapidly shearing granular materials.
abstract: Results from two types of experiments show that intergranular pore pressures fluctuated dynamically during rapid, steady shear deformation of water-saturated granular materials. During some fluctuations, the pore water locally supported all normal and shear stresses, while grain-contact stresses transiently fell to zero. Fluctuations also propagated outward from the shear zone; this process modifies grain-contact stresses in adjacent areas and potentially instigates shear-zone growth.
authors.forename: R M
authors.initials: RM
authors.lastname: Iverson
authors.forename: R G
authors.initials: RG
authors.lastname: Lahusen