Field Implementation of Microbially Induced Calcium Carbonate Precipitation for Surface Erosion Reduction of a Coastal Plain Sandy Slope
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 148, Issue 9
Abstract
Over the past decade, several researchers have demonstrated that microbially induced carbonate precipitation (MICP) has the potential to improve soil behavior in the laboratory setting. In this study, MICP was implemented at a sandy slope field site to enhance erosion resistance and surficial soil strength. Three application systems—surface spraying, prefabricated vertical drains (PVDs), and shallow trenches—were compared. Improvement of the treated soil was assessed using dynamic cone penetration, impinging jet, and pocket penetrometer tests and was monitored for 331 days. Results indicated that MICP is an effective soil improvement method for surficial and deeper applications. Penetration index values improved up to 73% and 55% at the surface and a depth of 30 cm, respectively. Critical shear stress and coefficient of erodibility values exhibited significant improvements. The surface spraying method is preferred for the treatment of large surficial areas, whereas the PVD method demonstrated deep soil improvement potential. The shallow trenches resulted in significant surficial improvements, however, in a highly localized manner. Post-treatment monitoring indicated no significant degradation of the treated areas with time and after major storm events (e.g., Hurricane Dorian). Based on the field results, a sensitivity analysis was performed to address the applicability of future MICP-field implementations in various soil types.
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Data Availability Statement
Some or all data, models, or codes that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
Funding from the NCDOT is appreciated. Any opinions, findings, and conclusions or recommendations expressed are those of the authors and do not necessarily reflect the views of NCDOT. The field work discussed herein was conducted with help from many research group members, namely, Jinung Do, Qianwen Liu, Ashkan Nafisi, Thomas Na, Rowshon Jadid, and Azmayeen Shahriar. Their dedication to this work allowed for a successful field project. Additionally, Dr. Mo. Gabr’s insight throughout the project was invaluable. We would like to thank Dr. Atefeh Zamani’s support during treatment recipe development. Finally, we would like to thank Dr. Matt Evans for his expertise in unsaturated soil behavior.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 148 • Issue 9 • September 2022
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© 2022 American Society of Civil Engineers.
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Received: Jun 3, 2021
Accepted: Apr 1, 2022
Published online: Jul 6, 2022
Published in print: Sep 1, 2022
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