Graduate Thesis Or Dissertation
 

Influence of expansive soils on structures in the Eugene area

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z029p7611

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  • Expansive soils in Eugene, Oregon present a problem to residents, consultants, contractors, and the city government. During the years 1977 to 1979, the nature and extent of the problem was identified, including an outline of the local occurrence of expansive soils and possible engineering solutions to the most often encountered problems. Two surveys were conducted to determine the influence of expansive soils on structures in the Eugene area. A literature review was made on the formation and occurrence of expansive clays in Eugene, general clay properties, and specific design methods of treating expansive soil problems. Interviews with city inspectors, soil scientists, engineers, and some non-technical people who have encountered structural damage, served to further outline the major factors. The surveys, literature review, and interviews were related to one another to arrive at specific sites and case histories involving expansive soils. Tests were run on soils from several of these sites to; (1) further delineate "expansive clay areas", (2) find a simple method of identifying local expansive soils which have caused problems, (3) determine the potential for volume change with a change in moisture content, and (4) relate potential volume change and structural conditions to damaged buildings. Conclusions are drawn regarding the occurrence of expansive soils in Eugene and engineering aspects of the problems encountered. Recommendations are made involving design procedures and future testing needs for construction on expansive soils in the Eugene area. Finally, a summary is made regarding unique elements of the treatise. Appendices include a summary of a mailed questionnaire , a research document on expansive soil properties, Soil Conservation Service soil series occurring in Eugene and a review of expansive soil test methods in common engineering use.
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