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Shear and Interface Strength of Clay at Very Low Effective Stress

by Robert C. Pedersen, Graduate Research Assistant; Department of Civil Engineering, The University of Texas at Austin, Austin, TX 78712,
Roy E. Olson, L. P. Gilvin Professor; Department of Civil Engineering, The University of texas at Austin, Austin, TX 78712,
Alan F. Rauch, Assistant Professor; Department of Civil Engineering, The University of Texas at Austin, Austin, TX, 78712,



Part of: From Soil Behavior Fundamentals to Innovations in Geotechnical Engineering: Honoring Roy E. Olson

Abstract:

Thin-specimen direct shear (TSDS) tests were conducted to measure the shearing strength of kaolinite, and interface strengths between kaolinite and acrylic plastic and anodized aluminum, at normal effective stresses from 1 to 2400 Pa (0.02 to 50 lb/ft²). At the lowest effective normal stresses, curved strength envelopes fitted through the data exhibited no cohesion and high secant friction angles. Accurate information on the behavior of soil in this low-pressure range is needed to properly interpret the behavior of prototype foundations in laboratory-scale model tests.

Copyright holder: Previously published in Geotechnical Testing Journal, ASTM International, 26(1), 2003, 71-78

Subject Headings: Effective stress | Soil strength | Shear tests | Shear strength | Strength of materials | Soil properties | Shear stress

 

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