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Science 10 November 1989:
Vol. 246. no. 4931, pp. 796 - 799
DOI: 10.1126/science.246.4931.796
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Articles

Dynamic Pore-Pressure Fluctuations in Rapidly Shearing Granular Materials

Richard M. Iverson 1 and Richard G. LaHusen 1

1 U.S. Geological Survey, Cascades Volcano Observatory, 5400 MacArthur Boulevard, Vancouver, WA 97661

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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Gravity-Driven Consolidation of Granular Slurries: Implications for Debris-Flow Deposition and Deposit Characteristics.
(2000)
Journal of Sedimentary Research 70, 64-83


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