Events

Workshop on Liquefaction Mitigation Study using Bio-Remediation
Wednesday, September 11, 2019 - 1:00pm to Thursday, September 12, 2019 - 11:00am

This workshop is hosted by Portland State University (PSU) in collaboration with the Natural Hazards Engineering Research Infrastructure Equipment Facility at the University of Texas at Austin (NHERI@UTexas) and the Center for Bio-mediated and Bio-inspired Geotechnics (CBBG) at Arizona State University. The workshop includes a seminar on Sept. 11 (1 to 5 pm) at PSU and a field demonstration on Sept. 12 (9 to 11 am) at a research site. 

Please use this link to RSVP for this event. Registration is free. Professional development hours (PDH) can be provided upon request. 
 
The workshop will focus on a recent project where the overall objective is to evaluate the potential for microbially induced desaturation (MID) to mitigate liquefaction potential in relatively fine-grained soils. Following completion of treatment, the NHERI@UTexas mobile field shaker (T-Rex) will be employed to measure the reduction in pore pressure generation potential in the treatment zone. Periodic monitoring using crosshole seismic measurements will be conducted following the T-Rex testing for the next 5 years to evaluate the persistence of the MID. 
 
The project addresses a major seismic problem in Oregon, where a substantial portion of the infrastructure is founded on non-plastic to low-plasticity silts that are susceptible to liquefaction in a Magnitude 9 Cascadia Subduction Zone earthquake. The two sites selected for this study are near the Portland International Airport (PDX) in northeast Portland and the Critical Energy Infrastructure (CEI) hub located in northwest Portland.  
 
Wednesday, September 11th, 2019 
Address: University Pointe Building (PNT) Room 102, 1955 SW Fifth Ave, Portland, OR 97201

1:00 pm – Introduction of NHERI@UTexas (Stokoe, UT) 
2:15 pm – Biogeotechnical mitigation of earthquake-induced soil liquefaction (Kavazanjian and van Paassen, ASU) 
3:00 pm – Coffee break  
3:30 pm – Liquefaction mitigation in silts using microbially induced desaturation (Khosravifar and Moug, PSU) 
4:15 pm – Contractor’s perspective on the liquefaction treatment method (Parmantier, Condon & Johnson) 
 
Thursday, September 12th, 2019 
Address: 9699 NE Sunderland Ave, Portland, OR 97211 
9:00 to 11:00 am – Field demonstration of (1) liquefaction mitigation of silts using microbially induced desaturation, and (2) field shaking using T-Rex.