Effect of Penetration Rate on Penetrometer Resistance in Clay
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 132, Issue 9
Abstract
This paper discusses the effects of penetration rate on the penetration resistance in soft clay for various shaped penetrometers (cone, T-bar, ball, and plate) and for T-bars with different aspect ratios. Constant rate (“normal”) and variable rate (“twitch”) penetration tests, where the penetration rate was successively halved over eight steps with the penetrometer advanced by one or two diameters in each step, were undertaken in the beam centrifuge at the University of Western Australia. The tests were conducted on samples reconstituted from clay collected from the Burswood site in Western Australia. The twitch tests showed higher penetration resistance than the corresponding normal tests after the penetration rate had been reduced by a factor of 16 due to cumulative effects of partial consolidation. The penetration rate at which the resistance started to increase due to partial consolidation was used to estimate the consolidation coefficient, , of the reconstituted clay. The interpreted values were similar to values estimated from other consolidation data, both in the centrifuge and from laboratory Rowe cell and constant rate of strain consolidation tests. In addition, results from in situ twitch tests at the Burswood site were examined to evaluate viscous effects on the penetration resistance.
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Acknowledgments
This work forms part of the activities of the Center for Offshore Foundation Systems (COFS), established and supported under the Australian Research Council’s Research Centers Program. The first and third authors hold International Postgraduate Research Scholarships and University Postgraduate Awards from the University of Western Australia. Acknowledgment is made of the excellent technical support for the centrifuge and field penetrometer tests, principally Mr. Don Herley and Mr. Alex Duff, and also of the advice provided by Professor Marcio Almeida of the Federal Univ. of Rio de Janeiro in the planning and execution of the centrifuge tests.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 132 • Issue 9 • September 2006
Pages: 1188 - 1196
Copyright
© 2006 ASCE.
History
Received: Dec 21, 2005
Accepted: Feb 2, 2006
Published online: Sep 1, 2006
Published in print: Sep 2006
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