Investigation and Modeling of Soil-Structure Interface Properties

by Patricia A. Lee, Ethyl Corp, United States,
William F. Kane, Ethyl Corp, United States,
Eric C. Drumm, Ethyl Corp, United States,
Richard M. Bennett, Ethyl Corp, United States,

Document Type: Proceeding Paper

Part of: Foundation Engineering: Current Principles and Practices


An investigation of some techniques suggested to reduce friction at the soil-structure interface, for example plastic sheet on sand, is presented, and a model proposed for characterizing such interface behavior. A series of direct shear tests were performed on various combinations of soils and construction materials. These included: clay-plastic sheet, clay-smooth concrete, clay-rough concrete, sand-plastic sheet, sand-smooth concrete, and sand-rough concrete. Each interface combination was tested over a range of normal stresses chosen to include the typical stresses to which a residential foundation is subjected. Shear strength and stiffness parameters were determined for each interface combination and the unloading response was observed.

Subject Headings: Shear tests | Shear strength | Concrete | Clays | Soil structures | Soil strength | Soil properties

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