Virtual meeting on zoom: https://pdx.zoom.us/j/86993794596
CEE Staff at email@example.com
The CEE Department is pleased to announce Kayla Sorenson's MS Thesis Defense: "Microbially Induced Desaturation for Mitigation of Earthquake Induced Soil Liquefaction in Silty Soil"
Date: Friday, April 30th, 2021
Time: 11:00 AM - 12:00 PM
Location: join using the following zoom link: https://pdx.zoom.us/j/
Advisor: Dr. Arash Khosravifar and Dr. Diane Moug
Abstract: A field study of liquefaction mitigation using microbially-induced desaturation (MID) was performed at two sites in Portland, Oregon, in the summer of 2019. The low-plasticity, liquefiable silts were treated to promote MID by injecting nutrients to stimulate native bacteria for a duration of four weeks. Crosshole pressure-wave velocity measurements, a vertical array of embedded sensors that measure water content and electrical conductivity, pre- and post-treatment seismic cone penetration tests, and direct soil sampling from treated soils indicated that liquefiable soils were successfully desaturated at both sites directly after treatment. The persistence of desaturation has been monitored since September 2019 and through seasonal fluctuations of the ground water table, including localized flooding. These data, which document MID longevity, are particularly important to establish MID as a viable option for liquefaction mitigation of silty soils.