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<p>Monitoring data were collected for four years at a microbially induced desaturation (MID) test site in Portland, Oregon. MID is an emerging ground improvement technique for mitigation of liquefaction triggering. In MID, a treatment solution is injected into targeted soils to stimulate native denitrifying microbes that produce nitrogen gas, desaturating the soil. In field trials in the summer of 2019, MID successfully desaturated fine-grained, granular soils to a degree of saturation (<i>S</i><sub><i>r</i></sub>) below 98.5% as determined by crosshole pressure wave velocity (<i>V</i><sub><i>p</i></sub>) measurements, and to less than 96.6% based on in situ moisture sensor measurements and physical sampling. Monitoring data collected in the four years since the field trial included <i>V</i><sub><i>p</i></sub> measurements from a seismic crosshole array, seismic cone penetration test (SCPTu) profiles with <i>V</i><sub><i>p</i></sub> measurements, in situ measurements of water content and electrical conductivity, piezocone dissipation tests, groundwater levels, and bulk density measurements on Shelby tube samples. In situ moisture and electrical conductivity sensors, <i>V</i><sub><i>p</i></sub> measurements, and soil sampling were all consistent with respect to changes in <i>S</i><sub><i>r</i></sub>. Overall, the monitoring data show that a reduction in <i>S</i><sub><i>r</i></sub> due to MID treatment was sustained throughout the four-year monitoring period.</p>

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Long-term monitoring of a microbially induced desaturation field trial in fine-grained soil

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Diane M. Moug,
  • Kayla R. Sorenson,
  • Arash Khosravifar,
  • Edward Kavazanjian Jr.,
  • Leon van Paassen

摘要

Monitoring data were collected for four years at a microbially induced desaturation (MID) test site in Portland, Oregon. MID is an emerging ground improvement technique for mitigation of liquefaction triggering. In MID, a treatment solution is injected into targeted soils to stimulate native denitrifying microbes that produce nitrogen gas, desaturating the soil. In field trials in the summer of 2019, MID successfully desaturated fine-grained, granular soils to a degree of saturation (Sr) below 98.5% as determined by crosshole pressure wave velocity (Vp) measurements, and to less than 96.6% based on in situ moisture sensor measurements and physical sampling. Monitoring data collected in the four years since the field trial included Vp measurements from a seismic crosshole array, seismic cone penetration test (SCPTu) profiles with Vp measurements, in situ measurements of water content and electrical conductivity, piezocone dissipation tests, groundwater levels, and bulk density measurements on Shelby tube samples. In situ moisture and electrical conductivity sensors, Vp measurements, and soil sampling were all consistent with respect to changes in Sr. Overall, the monitoring data show that a reduction in Sr due to MID treatment was sustained throughout the four-year monitoring period.