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    Effect of Light Biocementation on the Liquefaction Triggering and Post-Triggering Behavior of Loose Sands

    Source: Journal of Geotechnical and Geoenvironmental Engineering:;2021:;Volume ( 148 ):;issue: 001::page 04021170
    Author:
    Minyong Lee
    ,
    Michael G. Gomez
    ,
    Maya El Kortbawi
    ,
    Katerina Ziotopoulou
    DOI: 10.1061/(ASCE)GT.1943-5606.0002707
    Publisher: ASCE
    Abstract: Microbially induced calcite precipitation (MICP) is an environmentally conscious ground-improvement method that can enhance the engineering properties of granular soils through the precipitation of calcium carbonate (CaCO3) on soil particle surfaces and contacts. Although numerous studies have shown the ability of biocementation to improve the liquefaction resistance of loose sands, the effects of light cementation levels on undrained cyclic behaviors have remained relatively unexplored. A series of undrained monotonic and cyclic direct simple shear tests were performed to examine the effect of light biocementation (ΔVs<100  m/s and CaCO3 contents <0.9%) on the liquefaction triggering and post-triggering behavior of loose Ottawa F-65 sand subjected to varying loading magnitudes [cyclic stress ratio (CSR)=0.1 to 0.3]. Results suggest that the presence of light biocementation can significantly improve the liquefaction triggering resistance of loose sands, with log-linear increases in the number of cycles required to trigger liquefaction, which consistently correlated with cementation-induced Vs increases. Despite these remarkable pretriggering improvements, almost no improvements were observed in post-triggering strain accumulation and postcyclic reconsolidation behaviors, with Vs measurements indicating that small-strain improvements were largely erased following shearing events.
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      Effect of Light Biocementation on the Liquefaction Triggering and Post-Triggering Behavior of Loose Sands

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    contributor authorMinyong Lee
    contributor authorMichael G. Gomez
    contributor authorMaya El Kortbawi
    contributor authorKaterina Ziotopoulou
    date accessioned2022-05-07T21:17:27Z
    date available2022-05-07T21:17:27Z
    date issued2021-10-21
    identifier other(ASCE)GT.1943-5606.0002707.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4283545
    description abstractMicrobially induced calcite precipitation (MICP) is an environmentally conscious ground-improvement method that can enhance the engineering properties of granular soils through the precipitation of calcium carbonate (CaCO3) on soil particle surfaces and contacts. Although numerous studies have shown the ability of biocementation to improve the liquefaction resistance of loose sands, the effects of light cementation levels on undrained cyclic behaviors have remained relatively unexplored. A series of undrained monotonic and cyclic direct simple shear tests were performed to examine the effect of light biocementation (ΔVs<100  m/s and CaCO3 contents <0.9%) on the liquefaction triggering and post-triggering behavior of loose Ottawa F-65 sand subjected to varying loading magnitudes [cyclic stress ratio (CSR)=0.1 to 0.3]. Results suggest that the presence of light biocementation can significantly improve the liquefaction triggering resistance of loose sands, with log-linear increases in the number of cycles required to trigger liquefaction, which consistently correlated with cementation-induced Vs increases. Despite these remarkable pretriggering improvements, almost no improvements were observed in post-triggering strain accumulation and postcyclic reconsolidation behaviors, with Vs measurements indicating that small-strain improvements were largely erased following shearing events.
    publisherASCE
    titleEffect of Light Biocementation on the Liquefaction Triggering and Post-Triggering Behavior of Loose Sands
    typeJournal Paper
    journal volume148
    journal issue1
    journal titleJournal of Geotechnical and Geoenvironmental Engineering
    identifier doi10.1061/(ASCE)GT.1943-5606.0002707
    journal fristpage04021170
    journal lastpage04021170-19
    page19
    treeJournal of Geotechnical and Geoenvironmental Engineering:;2021:;Volume ( 148 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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