Rheological Response of Natural Soft Coastal Mud under Oscillatory Shear Loadings
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144, Issue 4
Abstract
The dynamic rheological properties of natural cohesive sediments are essential to understanding cohesive sediment transport under waves. In this study, dynamic rheological measurements of natural mud collected from Yueqing Bay, Zhejiang province, China, were conducted under oscillatory shear loadings in a laboratory. The mud samples exhibited nonlinear viscoelastic behavior when the strain amplitude was larger than 0.0005. Mud fluidization began at a large strain amplitude because of the significant decrease in complex viscosity. Strain amplitude was found to play an important role in mud fluidization, whereas frequency had limited influence under small-amplitude oscillatory shear. Time-dependent nonlinear stress waveforms were analyzed to further quantify the nonlinear viscoelastic response of natural mud. The nonlinearity of the samples increased with strain amplitude; however, it decreased at extremely large strain amplitudes.
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Acknowledgments
This work was financially supported by the project Morphodynamic Evolution of the Pearl River Network-Estuary System and Its Implications for Delta Management (Grant 2016YFC0402607). In addition, the authors acknowledge the financial support by Projects 2017J05141, JA15373, and YKJ15010R. The authors thank the editor and reviewers for their valuable suggestions. Additionally, the authors thank the School of Agriculture and Biology at Shanghai Jiao Tong University for providing the rheometer used in this study.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144 • Issue 4 • July 2018
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© 2018 American Society of Civil Engineers.
History
Received: Aug 1, 2017
Accepted: Feb 12, 2018
Published online: May 8, 2018
Published in print: Jul 1, 2018
Discussion open until: Oct 8, 2018
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