Graduate Thesis Or Dissertation
 

Engineering properties of Southeast Alaskan forest soils

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/9593tz86h

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  • The strength of both undisturbed and compacted soils from 10 sites in the slide-prone Tongass National Forest in SE Alaska were studied. Index property tests were also conducted on disturbed samples. The index tests included natural water content, Atterberg Limits, specific gravity of solids, grain size distribution, and moisture-density relationship. The effect of drying on the soils was studied by conducting the Atterberg Limits tests on materials which had not been dried below their field water content and comparing the results to those of Atterberg Limits tests conducted on air-dried material. Nine of the 10 samples studied exhibited a marked decrease in plasticity as a result of drying. Consolidated-undrained triaxial shear tests with pore pressure measurements were conducted on both undisturbed and compacted samples to evaluate the soils' effective strength parameters. Test results on several undisturbed specimens from a single site often did not provide comparable results because of material variability. In general, an increase in effective angle of internal friction with decreasing plastic index and increasing dry density was observed. Applications of the test results to problems in slope stability analysis and use of the soils in engineered construction are discussed.
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