Graduate Thesis Or Dissertation
 

Engineering properties of Oregon and Washington coast range soils

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  • Landslides are frequent in the steep forested regions of the Oregon and Washington coastal mountain ranges. The need for forest products has resulted in increasing logging activity in these marginally stable areas. The occurrence of landslides has increased, which in turn has focused greater interest in slope stability management. Of the factors required for a slope stability analysis, the engineering properties of the soils comprising the slope are of great importance. In this study soils from 11 sites were collected and tested to determine their index properties and effective strength parameters (undisturbed and compacted). The index properties determined were natural moisture content, liquid limit, plastic limit, specific gravity, grain size distribution, moisture-density relationships, and in situ density. Effective strength parameters were determined by consolidated-undrained triaxial tests with backpressure saturation. It was found that the soils from these regions can generally be classified as cohesionless silty sands. The index properties as a rule showed little variance. The effective angle of internal friction (6') ranged from approximately 30 to 40 degrees, with an average value of 35.6 degrees.
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