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Geological Engineering Commons

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Earth Sciences

2010

Articles 1 - 1 of 1

Full-Text Articles in Geological Engineering

Effects Of Soil Aggregates On Debris-Flow Mobilization: Results From Ring-Shear Experiments, Neal R. Iverson, Janet E. Mann, Richard M. Iverson Jun 2010

Effects Of Soil Aggregates On Debris-Flow Mobilization: Results From Ring-Shear Experiments, Neal R. Iverson, Janet E. Mann, Richard M. Iverson

Geological and Atmospheric Sciences Publications

Rates and styles of landslide motion are sensitive to pore-water pressure changes caused by changes in soil porosity accompanying shear deformation. Soil may either contract or dilate upon shearing, depending upon whether its initial porosity is greater or less, respectively, than a critical-state porosity attained after sufficiently high strain. We observed complications in this behavior, however, during rate-controlled (0.02 m s− 1) ring-shear experiments conducted on naturally aggregated dense loamy sand at low confining stresses (10.6 and 40 kPa). The aggregated soil first dilated and then contracted to porosities less than initial values, whereas the same soil with ...