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Experimental and Numerical Analysis ...

Kwon, Patrick Sun,

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Experimental and Numerical Analysis for Microbially Induced Desaturation and Precipitation (MIDP) for Liquefaction Mitigation /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Experimental and Numerical Analysis for Microbially Induced Desaturation and Precipitation (MIDP) for Liquefaction Mitigation // Patrick Sun Kwon.
Author:	Kwon, Patrick Sun,
Description:	1 electronic resource (206 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-06, Section: B.
Contained By:	Dissertations Abstracts International86-06B.
Subject:	Geotechnology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31637584
ISBN:	9798346807186

Experimental and Numerical Analysis for Microbially Induced Desaturation and Precipitation (MIDP) for Liquefaction Mitigation /
Kwon, Patrick Sun,

Experimental and Numerical Analysis for Microbially Induced Desaturation and Precipitation (MIDP) for Liquefaction Mitigation /Patrick Sun Kwon. - 1 electronic resource (206 pages)

Source: Dissertations Abstracts International, Volume: 86-06, Section: B.

This study investigates the effectiveness of Microbially Induced Desaturation and Precipitation (MIDP), a bio-mediated ground improvement technique, for mitigating earthquake-induced soil liquefaction in stratified soil conditions. A meter-scale tank experiment was conducted to simulate two-dimensional planar flow in layered sand and silt profiles, evaluating the impact of MIDP treatment on soil properties and gas behavior. The experiment demonstrated successful desaturation of the target sand layer. However, biogenic gas migrated upwards and formed a gas lens beneath the overlying silt layer. Subsequent treatment cycles led to further desaturation and episodic gas migration through the silt layer, resulting in an equilibrium state with fluctuating degrees of saturation ranging from 65 to 90%. Calcium carbonate precipitation was observed, with concentrations ranging from 0.5% to 1.6% after 10 cycles, exhibiting higher values near the inlet due to increased reaction rates. The study also developed a numerical reactive transport model to predict substrate and product distribution, porosity, saturation, and hydraulic conductivity changes during MIDP treatment. The model, validated against experimental data, offered insights into the influence of biomass accumulation, attachment, and varying reaction rates on treatment outcomes. The findings highlight the potential of MIDP as a sustainable ground improvement method for liquefaction mitigation, emphasizing the importance of considering soil heterogeneity and gas migration in treatment design and implementation. Additionally, the study underscores the need for further research into the long-term effects of MIDP, including gas persistence and the influence of bio-cementation on soil strength and stiffness. This research shows the potential for enhancing the stability of infrastructure in earthquake-prone regions using MIDP.

English

ISBN: 9798346807186Subjects--Topical Terms:

1018558
Geotechnology.
Subjects--Index Terms:

Denitrification

Experimental and Numerical Analysis for Microbially Induced Desaturation and Precipitation (MIDP) for Liquefaction Mitigation /
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520 $a This study investigates the effectiveness of Microbially Induced Desaturation and Precipitation (MIDP), a bio-mediated ground improvement technique, for mitigating earthquake-induced soil liquefaction in stratified soil conditions. A meter-scale tank experiment was conducted to simulate two-dimensional planar flow in layered sand and silt profiles, evaluating the impact of MIDP treatment on soil properties and gas behavior. The experiment demonstrated successful desaturation of the target sand layer. However, biogenic gas migrated upwards and formed a gas lens beneath the overlying silt layer. Subsequent treatment cycles led to further desaturation and episodic gas migration through the silt layer, resulting in an equilibrium state with fluctuating degrees of saturation ranging from 65 to 90%. Calcium carbonate precipitation was observed, with concentrations ranging from 0.5% to 1.6% after 10 cycles, exhibiting higher values near the inlet due to increased reaction rates. The study also developed a numerical reactive transport model to predict substrate and product distribution, porosity, saturation, and hydraulic conductivity changes during MIDP treatment. The model, validated against experimental data, offered insights into the influence of biomass accumulation, attachment, and varying reaction rates on treatment outcomes. The findings highlight the potential of MIDP as a sustainable ground improvement method for liquefaction mitigation, emphasizing the importance of considering soil heterogeneity and gas migration in treatment design and implementation. Additionally, the study underscores the need for further research into the long-term effects of MIDP, including gas persistence and the influence of bio-cementation on soil strength and stiffness. This research shows the potential for enhancing the stability of infrastructure in earthquake-prone regions using MIDP.
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650 4 $a Soil sciences. $3 2122699
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653 $a Denitrification
653 $a Liquefaction mitigation
653 $a Numerical modeling
653 $a Soil improvement
690 $a 0428
690 $a 0768
690 $a 0481
710 2 $a Arizona State University. $b Civil, Environmental and Sustainable Engineering. $e degree granting institution. $3 3815976
720 1 $a Kavazanjian, Edward $e degree supervisor.
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