Postpeak Strength of Interfaces in a Stress-Dilatancy Framework
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 11
Abstract
Laboratory sand-steel interface tests, using a range of sand sizes on a wide range of surface roughnesses, have been conducted using a direct shear apparatus modified to enable reliable measurements of both friction and dilation. The paper looks at the minimum interface strength after peak, termed here the postpeak strength, and assesses its dependence on roughness, density, and stress level. Its upper limit is the large displacement direct shear friction angle, related to but not equal to the critical state friction angle. When data are normalized by this value, they show linear dependence on the logarithm of relative roughness in the intermediate zone between smooth and rough. Once the roughness dependence of the postpeak strength has been allowed for, dilatant interfaces are found to follow classical stress–dilatancy relationships. It appears that there is no fundamental difference in the responses of sand-on-steel or sand-on-sand interfaces.
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Acknowledgments
The writers offer their thanks to Dr. Thomas Pearce and Alan Speight of the Institute of Grinding Technology, University of Bristol, for the use of their profilometer; also, to Mike Pope for technician support in the laboratory. Financial support from the Engineering and Physical Sciences Research Council, U.K., is also gratefully acknowledged.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 11 • November 2006
Pages: 1474 - 1484
Copyright
© 2006 ASCE.
History
Received: Nov 1, 2005
Accepted: Feb 8, 2006
Published online: Nov 1, 2006
Published in print: Nov 2006
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