TY - JOUR
T1 - Centrifuge Model Testing of Liquefaction Mitigation via Denitrification-Induced Desaturation
AU - Hall, Caitlyn A.
AU - Hernandez, Gabby
AU - Darby, Kathleen M.
AU - van Paassen, Leon
AU - Kavazanjian, Edward
AU - DeJong, Jason
AU - Wilson, Daniel
N1 - Funding Information:
Work described herein was supported by the National Science Foundation Geomechanics and Geosystems Engineering and Engineering Research Center programs under grants numbered CMMI-0703000, CMMI-0727463 CMMI-1233658, CMMI-0830182, and ERC-1449501. Operation of the centrifuge is supported by NSF under the NHERI program, CMMI-1520581. The authors are grateful for this support. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect those of the NSF.
PY - 2018
Y1 - 2018
N2 - Centrifuge model tests were conducted to evaluate the potential for earthquake-induced soil liquefaction mitigation via microbially mediated denitrification (dissimilatory reduction of nitrogen). Desaturation by denitrifying bacteria is the first stage of a two-stage process to increase earthquake-induced liquefaction resistance referred to as microbially induced desaturation and precipitation (MIDP). In the test described herein, denitrification was induced in Ottawa F-65 sand on the 1-m radius centrifuge at the University of California, Davis NHERI/CGM centrifuge. The degree of saturation was monitored during testing by monitoring soil moisture content. After monitoring indicated that significant desaturation had been induced at 1 g by an enriched denitrifying microorganism culture, the model was accelerated to 80 g. Saturation measurements during spin-up provided insight on the influence of steady state pore pressure on biogenic gas desaturation. Cyclic loading during the ultimate centrifuge acceleration of 80 g demonstrated desaturation via MIDP has potential to mitigate earthquake-induced soil liquefaction.
AB - Centrifuge model tests were conducted to evaluate the potential for earthquake-induced soil liquefaction mitigation via microbially mediated denitrification (dissimilatory reduction of nitrogen). Desaturation by denitrifying bacteria is the first stage of a two-stage process to increase earthquake-induced liquefaction resistance referred to as microbially induced desaturation and precipitation (MIDP). In the test described herein, denitrification was induced in Ottawa F-65 sand on the 1-m radius centrifuge at the University of California, Davis NHERI/CGM centrifuge. The degree of saturation was monitored during testing by monitoring soil moisture content. After monitoring indicated that significant desaturation had been induced at 1 g by an enriched denitrifying microorganism culture, the model was accelerated to 80 g. Saturation measurements during spin-up provided insight on the influence of steady state pore pressure on biogenic gas desaturation. Cyclic loading during the ultimate centrifuge acceleration of 80 g demonstrated desaturation via MIDP has potential to mitigate earthquake-induced soil liquefaction.
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U2 - 10.1061/9780784481455.011
DO - 10.1061/9780784481455.011
M3 - Conference article
AN - SCOPUS:85048758747
SN - 0895-0563
VL - 2018-June
SP - 117
EP - 126
JO - Geotechnical Special Publication
JF - Geotechnical Special Publication
IS - GSP 290
T2 - 5th Geotechnical Earthquake Engineering and Soil Dynamics Conference: Liquefaction Triggering, Consequences, and Mitigation, GEESDV 2018
Y2 - 10 June 2018 through 13 June 2018
ER -