Geotechnical properties of debris-flow sediments and slurries
January 1, 1997
Measurements of geotechnical properties of various poorly sorted debris-flow sediments and slurries (??? 32 mm diameter) emphasize their granular nature, and reveal that properties of slurries can differ significantly from those of compacted sediments. Measurements show that: (1) cohesion probably offers little resistance to shear in most debris flows under low confining stresses normally found in nature; (2) intrinsic hydraulic permeabilities of compacted debris-flow sediments vary from about 10-14-10-9 m2; permeabilities of 'typical' debris-flow slurries fall toward the low end of the range; (3) debris-flow slurries are characterized by very large values of 'elastic' compressibility (C approx. 10-2 kPa-1); and (4) hydraulic diffusivities of quasistatically consolidating slurries are approx. 10-4-10-7 m2/s. Low hydraulic diffusivity of debris slurries permits excess fluid pressure and low effective strength to persist during sediment transport and deposition.
Citation Information
Publication Year | 1997 |
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Title | Geotechnical properties of debris-flow sediments and slurries |
Authors | J. J. Major, R.M. Iverson, D.F. McTigue, S. Macias, B.K. Fiedorowicz |
Publication Type | Conference Paper |
Publication Subtype | Conference Paper |
Index ID | 70020072 |
Record Source | USGS Publications Warehouse |
USGS Organization | Cascades Volcano Observatory |