Analytical Solution for Vacuum Electroosmosis Consolidation Considering Nonlinear Attenuation of Electric Permeability Coefficient of Copper-Contaminated Sediment
Publication: Journal of Environmental Engineering
Volume 149, Issue 11
Abstract
Conventional vacuum electroosmosis consolidation theory tends to assume that the electric permeability coefficient remains unchanged or attenuates linearly. In contrast, the sediment from environmental dredging projects contains copper contaminants, whose electrochemical reactions during electroosmosis may influence the soil properties. Consequently, electroosmosis experiments were conducted for copper-contaminated sediments. It was found that the electric permeability coefficient attenuated rapidly due to the generation of copper hydroxide flocculant deposits under electrochemical reactions. The attenuation was 67.89% after 48 h, and its attenuation trend had obvious nonlinear characteristics. On this basis, an expression for the attenuation of the electric permeability coefficient with time was obtained by fitting an exponential function. A two-dimensional vacuum electroosmosis consolidation model considering the nonlinear attenuation rule of the electric permeability coefficient was established, and the analytical solution of the pore water pressure was deduced. Vacuum electroosmosis experiments on contaminated sediment were carried out, and the measurement results of pore water pressure at the anode verified the rationality of the analytical solution. It was also compared with conventional vacuum electroosmosis consolidation theory, which showed that the analytical solution in this study is better able to predict the dissipation of pore water pressure during long-term vacuum electroosmosis.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors acknowledge the funding provided by the National Natural Science Foundation of China (No. 52278343). The authors would like to appreciate the reviewers and the editor for their excellent comments and suggestions to improve the quality of this article.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 149 • Issue 11 • November 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 16, 2023
Accepted: Jul 21, 2023
Published online: Sep 11, 2023
Published in print: Nov 1, 2023
Discussion open until: Feb 11, 2024
ASCE Technical Topics:
- Biological processes
- Chemical compounds
- Chemical elements
- Chemicals
- Chemistry
- Consolidated soils
- Continuum mechanics
- Copper (chemical)
- Dynamics (solid mechanics)
- Engineering mechanics
- Environmental engineering
- Geomechanics
- Geotechnical engineering
- Heavy metals
- Osmosis
- Permeability (soil)
- Pore pressure
- Pore water
- Pressure (type)
- River engineering
- Sediment
- Soil mechanics
- Soil properties
- Soils (by type)
- Solid mechanics
- Waste management
- Water (by type)
- Water and water resources
- Water management
- Water pressure
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