Mitigation of liquefaction beneath existing facilities using denitrification

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Microbially mediated dissimilatory reduction of nitrate, or denitrification, offers the promise for non-disruptive mitigation of the potential for earthquake-induced liquefaction beneath existing facilities. Denitrification can mitigate liquefaction in two ways: by desaturation of the soil through generation of gas and by cementation of the soil through precipitation of calcium carbonate as calcite. Laboratory column tests demonstrate that desaturation via biogenic gas occurs almost immediately upon stimulation of the denitrifying microbes, providing short term mitigation while calcite is being precipitated. Once enough calcite is precipitated, denitrification provides long term mitigation. Laboratory simple shear testing demonstrates that a relatively small decrease in the degree of saturation, as little as 5%, and a relatively small amount of calcite precipitation, as little as 0.4 percent of the dry weight of the soil, can both provide substantial mitigation of liquefaction potential. When there is sufficient normal stress on the ground surface (mitiga t ing the potential for shallow crack development due to gas production), these processes are nondisruptive and thus provide a non-disruptive means of mitigating liquefaction beneath existing facilities.

Original languageEnglish (US)
Title of host publication11th National Conference on Earthquake Engineering 2018, NCEE 2018
Subtitle of host publicationIntegrating Science, Engineering, and Policy
PublisherEarthquake Engineering Research Institute
Pages6768-6777
Number of pages10
ISBN (Electronic)9781510873254
StatePublished - 2018
Event11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018 - Los Angeles, United States
Duration: Jun 25 2018Jun 29 2018

Publication series

Name11th National Conference on Earthquake Engineering 2018, NCEE 2018: Integrating Science, Engineering, and Policy
Volume11

Conference

Conference11th National Conference on Earthquake Engineering 2018: Integrating Science, Engineering, and Policy, NCEE 2018
CountryUnited States
CityLos Angeles
Period6/25/186/29/18

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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