Landfill Liner Interface Strengths from Torsional‐Ring‐Shear Tests
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Volume 120, Issue 3
Abstract
A torsional‐ring‐shear apparatus and test procedure are described for measuring soil/geosynthetic and geosynthetic/geosynthetic interface strengths. Typical interface strengths are presented for a double‐composite liner system and the relevancy of ring‐shear strengths is illustrated using the slope failure at the Kettleman Hills Waste Repository, Kettleman City, Calif. The results of undrained ring‐shear tests show that for a clay/geomembrane interface: (1) Interface strength depends on plasticity and compaction water content of the clay, and the applied normal stress; (2) interface strengths measured with the torsional‐ring‐shear apparatus are in excellent agreement with back‐calculated field strengths; and (3) peak and residual interface failure envelopes are nonlinear, and the nonlinearity should be modeled in stability analyses instead of as a combination of cohesion and friction angle. Design recommendations for interface strengths and stability analyses are also presented.
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Published In
Journal of Geotechnical Engineering
Volume 120 • Issue 3 • March 1994
Pages: 597 - 615
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Oct 27, 1992
Published online: Mar 1, 1994
Published in print: Mar 1994
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