Dynamic Centrifuge Tests to Evaluate the Seismic Performance of an Embankment Resting on Liquefiable Ground Improved by Unreinforced and Reinforced Soil–Cement Columns
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 148, Issue 12
Abstract
A series of centrifuge experiments were conducted to identify different internal failure modes of a group of soil-cement (SC) columns (e.g., shearing and tension due to bending) under combined effects of embankment loading and liquefaction-induced lateral spreading. The results were also used to investigate how an increase in the flexural/shear strength of SC columns (using high-strength steel reinforcement bars) can affect their ability to limit settlements or deformations. The centrifuge experiments included two centrifuge tests of liquefiable foundation reinforced by SC columns with and without high-strength steel reinforcement cores during strong earthquake loading. It was found that during and after cracking of the SC columns, shear and tilting failure is the prominent failure mechanism. The test results showed that increasing the flexural capacity of SC columns can reduce the potential for earthquake-induced liquefaction and associated damage. Compared with conventional SC columns, reinforced soil-cement (RSC) columns are more effective in providing confinement for the soil under the embankment during strong shaking events, resulting in lower shaking-induced pore-water pressure and a reduction in the lateral deformation of the soil and embankment.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available upon reasonable request.
Acknowledgments
Support for this work was partially provided by Deep Foundation Institute (DFI project number: CPF-2021-GRIM-2). The authors appreciate the assistance of the staff of the Centrifuge facility at the National Central University of Taiwan. Any opinions, findings, or recommendations expressed herein are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the above organizations. The assistance of the students at the center is also greatly appreciated.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 148 • Issue 12 • December 2022
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© 2022 American Society of Civil Engineers.
History
Received: Jun 15, 2021
Accepted: May 26, 2022
Published online: Sep 20, 2022
Published in print: Dec 1, 2022
Discussion open until: Feb 20, 2023
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