Dynamic Shear Behavior of a Needle-Punched Geosynthetic Clay Liner
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 8
Abstract
An experimental investigation of the dynamic internal shear behavior of a hydrated needle-punched geosynthetic clay liner is presented. Monotonic and cyclic displacement-controlled shear tests were conducted at a single normal stress to investigate the effects of displacement rate, displacement amplitude, number of cycles, frequency, and motion waveform on material response. Monotonic shear tests indicate that peak shear strength first increased and then decreased with increasing displacement rate. Cyclic shear tests indicate that cyclic response was primarily controlled by displacement amplitude. Excitation frequency and waveform had little effect on cyclic shear behavior or postcyclic static shear strength. Number of cycles also had little effect on postcyclic static shear strength. Shear stress versus shear displacement diagrams displayed hysteresis loops that are broadly similar to those for natural soils with some important differences due to the presence of needle-punched reinforcement. Secant shear stiffness displayed strong reduction with increasing displacement amplitude and degradation with continued cycling. Values of damping ratio were significantly higher than those typical of natural clays at lower shear strain levels. Finally, cyclic tests with increasing displacement amplitude yielded progressively lower postcyclic static peak strengths due to greater levels of reinforcement damage. Postcyclic static residual strengths were unaffected by prior cyclic loading.
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Acknowledgments
Financial support for this investigation was provided by a grant from CETCO of Arlington Heights, Ill. and a University Graduate Fellowship from Ohio State University for the first writer. This support is gratefully acknowledged. The writers would like to thank David Varathungarajan, formerly a senior at Ohio State University, for his assistance with the experimental work presented in this paper. In addition, we thank Jim Olsta of CETCO for his general assistance with the project and Professor Steven L. Kramer of the University of Washington for a valuable discussion on the application of the equivalent linear model to cyclic shear behavior of geosynthetic clay liners.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 8 • August 2007
Pages: 973 - 983
Copyright
© 2007 ASCE.
History
Received: Jul 11, 2006
Accepted: Nov 8, 2006
Published online: Aug 1, 2007
Published in print: Aug 2007
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