Influence of soil aggregation on slope stability in the Oregon Coast Ranges |
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| Authors: | Carlton S Yee R Dennis Harr |
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| Institution: | (1) School of Forestry, Oregon State University, 97331 Corvallis, Oregon, U.S.A.;(2) USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, 97331 Corvallis, Oregon, U.S.A.;(3) Present address: School of Natural Resources, Humboldt State University, 95521 Arcata, California, U.S.A. |
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| Abstract: | Two major cohesionless soil series of the central Coast Ranges of Oregon were examined for soil and hydrologic properties.
Although derived from different parent material, the Bohannon and Klickitat series exhibited nearly identical values of soil
and hydrologic properties. Aggregation in both soils was found to be the most important property, for it influences shear
strength and subsurface water movement, prime components of slope stability. The unusually high angle of internal friction
of both cohesionless soils was 40° to 41°. The angle of internal friction was affected significantly by the mode of wetting.
Subsurface water movement was predominantly by unsaturated flow. The influence of soil aggregation on pore-size distribution
and arrangement created conditions where unsaturated flow was an effective means for water dispersal in both soils during
most observed storm events. Considering the large area covered by these two soil series, aggregation appears to be an important
slope-stability property with regional significance. |
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