Energy Capacity versus Liquefaction Strength Investigated by Cyclic Triaxial Tests on Intact Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 147, Issue 4
Abstract
A series of cyclic triaxial tests are performed on a number of intact soils sampled from various sites to examine their liquefaction behavior in terms of energy. Although several laboratory tests on reconstituted specimens carried out in cyclic simple shear tests have already shown that liquefaction behavior is uniquely determined by cumulative dissipated energy during cyclic loading irrespective of stress-time histories, it is found here that the energy capacity for liquefaction tends to vary depending on the cyclic stress ratio (CSR) or number of cycles for liquefaction () in triaxial tests on intact soils of higher cyclic resistance ratio (CRR) in particular. This is found to be specific to cyclic triaxial tests wherein axial strains tend to grow larger on the extension side than on the compression side. In overcoming this unfavorable trend in view of in situ simple shear stress condition, a unique correlation between the energy capacity and CRR for or 20 is developed by utilizing the test results, so that the liquefaction energy capacity to be used in the energy-based method (EBM) can be readily evaluated from CRR irrespective of soil types.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research became possible thanks to a soil investigation initiative lead by PWRI, Japan, as well as the dissemination of the associated database for this research. A research committee in the Japanese Geotechnical Society worked for four years (2015–2019) and provided a forum to discuss how to deal with the database from the viewpoint of energy. The authors (also belonging to the committee) are grateful to all the committee members for their cooperation in the committee activities. Professor Sako, Nihon University, Japan, is gratefully acknowledged for kindly providing valuable torsional cyclic shear test data that is used in this paper.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 147 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 5, 2019
Accepted: Nov 12, 2020
Published online: Jan 20, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 20, 2021
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