Geotechnical properties of debris-flow sediments and slurries
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Abstract
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.
Suggested Citation
Major, J., Iverson, R., McTigue, D., Macias, S., Fiedorowicz, B., 1997, Geotechnical properties of debris-flow sediments and slurries, in 1st International conference on debris-flow hazards mitigation: Mechanics, prediction, and assessment, proceedings, San Francisco, CA, August 7-9, 1997, p. 249-259.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Geotechnical properties of debris-flow sediments and slurries |
| Year Published | 1997 |
| Language | English |
| Publisher | ASCE |
| Publisher location | New York, NY, United States |
| Contributing office(s) | Cascades Volcano Observatory |
| Description | 11 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Conference publication |
| Larger Work Title | 1st International conference on debris-flow hazards mitigation: Mechanics, prediction, and assessment, proceedings |
| First page | 249 |
| Last page | 259 |
| Conference Title | Proceedings of the 1997 1st International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment |
| Conference Location | San Francisco, CA |
| Conference Date | August 7-9, 1997 |