Dynamic Pore-Pressure Fluctuations in Rapidly Shearing Granular Materials

Science  10 Nov 1989:
Vol. 246, Issue 4931, pp. 796-799
DOI: 10.1126/science.246.4931.796


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.