Geo-Congress 2020
Feasibility Study on Liquefaction Mitigation of Fraser River Sediments by Microbial Induced Desaturation and Precipitation (MIDP)
Publication: Geo-Congress 2020: Biogeotechnics (GSP 320)
ABSTRACT
A bio-mediated ground improvement technique known as microbial-induced desaturation and precipitation (MIDP) via denitrification can be used to introduce biogas and bio-minerals into the soil matrix. A feasibility study was performed to assess the potential of MIDP to stabilize sediments under an embankment along the Fraser River in Richmond, a coastal city in Canada. Locally collected sediments were subjected to multiple MIDP treatment cycles under similar stress conditions as expected in the field using a modified triaxial test set up. The hydraulic conductivity was determined after each treatment cycle. The mechanical response of the treated soil was evaluated under undrained loading conditions. Results show that with increasing treatment cycles, the hydraulic conductivity decreased significantly. The original tangent modulus increased with the number of treatment cycles as did the slope of the straight line passing through the phase transformation point in the effective stress path plane. The effective stress paths of treated samples almost merged, and they lie somewhere between the drained and undrained lines.
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ACKNOWLEDGMENT
This research was supported by the Chinese Scholarship Council (CSC), the Postgraduate Research&Practice Innovation Program of Jiangsu Province No. KYZZ16_0270, the National Science Foundation (NSF) under NSF CA No. EEC-1449501 and partly supported by Groundwater Technology and Municipality of Richmond BC, Canada. These supports are gratefully acknowledged.
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Information & Authors
Information
Published In
Geo-Congress 2020: Biogeotechnics (GSP 320)
Pages: 121 - 131
Editors: Edward Kavazanjian Jr., Ph.D., Arizona State University, James P. Hambleton, Ph.D., Northwestern University, Roman Makhnenko, Ph.D., University of Illinois at Urbana-Champaign, and Aaron S. Budge, Ph.D., Minnesota State University, Mankato
ISBN (Online): 978-0-7844-8283-4
Copyright
© 2020 American Society of Civil Engineers.
History
Published online: Feb 21, 2020
ASCE Technical Topics:
- Business management
- Climates
- Effective stress
- Engineering fundamentals
- Environmental engineering
- Feasibility studies
- Geomechanics
- Geotechnical engineering
- Meteorology
- Methodology (by type)
- Microbes
- Mitigation and remediation
- Organisms
- Practice and Profession
- Precipitation
- Research methods (by type)
- River engineering
- Rivers and streams
- Sediment
- Soil liquefaction
- Soil mechanics
- Soil properties
- Stress (by type)
- Structural analysis
- Structural engineering
- Water and water resources
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