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Soil Properties for Slope Stability Analysis; Oregon and Washington Coastal Mountains

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Soils from 11 sites in the Oregon-Washington coastal region were collected and tested to determine their index properties and effective strength parameters. The index properties were natural moisture content, liquid limit, plastic limit, specific gravity, grain size distribution, moisture-density relationship, and in situ density. Effective strength parameters were determined by consolidated-undrained triaxial tests with backpressure saturation. The soils tested can generally be classified as slightly cohesive silty sands. The average angle of internal friction and saturated unit weight were 35.4 degrees and 1.86 g/cm³, respectively. For the soil population represented by this study it was estimated that 95 percent would have angles of internal friction exceeding 26.2 degrees and saturated unit weights exceeding 1.56 g/cm³. These statistics may be useful for slope analysis in the region. Forest Sci. 29:823-833.

Keywords: Landslides; analysis; forest management; mass wasting; slope stability

Document Type: Journal Article

Affiliations: Materials Engineer, Alyeska Pipeline Service Co., Anchorage, AK

Publication date: December 1, 1983

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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