Direct shear testing of polished slickensided surfaces |
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| Authors: | Christopher L Meehan Thomas L Brandon J Michael Duncan Binod Tiwari |
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| Institution: | (1) Department of Civil and Environmental Engineering, University of Delaware, 301 DuPont Hall, Newark, DE 19716, USA;(2) Department of Civil and Environmental Engineering, Virginia Tech, 200 Patton Hall, Blacksburg, VA 24061, USA;(3) Dept. of Civil and Environmental Engineering, California State University, Fullerton, 800 N. State College Blvd. E-419, Fullerton, CA 92834, USA |
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| Abstract: | A series of ring shear and direct shear tests were performed to measure the drained residual strength of three clay soils.
For each of the soils, slickensided direct shear specimens were prepared by wire-cutting intact specimens, and polishing the
resulting shear plane on a variety of surfaces to align the clay particles in the direction of shear. Drained direct shear
tests were then conducted on each of the polished specimens. The resulting shear strengths were compared with the residual
strengths measured in the ring shear device to evaluate the effectiveness of the different polishing techniques for creating
slickensided surfaces. Test results indicated that the measurement of residual strengths along preformed slickensided surfaces
is extremely sensitive to both the soil type and the slickenside preparation technique that is used. Consequently, this approach
does not appear to be a viable alternative to conventional repeated direct shear or ring shear tests to measure residual shear
strengths. |
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