NHERI@UTexas Experimental
Facility Annual Workshop

Stiffness-based Ground Improvement Monitoring Workshop
September 11-12, 2019

You are invited to attend a workshop on Stiffness-based Ground Improvement Monitoring in Portland, OR. This workshop is hosted by the Natural Hazards Engineering Research Infrastructure Equipment Facility at the University of Texas at Austin (NHERI@UTexas) in collaboration with Portland State University and the Center for Bio-mediated and Bio-inspired Geotechnics (CBBG) at Arizona State University. The workshop will be held from 1 pm Wednesday, Sept. 11 to 12 pm Thursday, Sept. 12 2019. The proposed workshop will include a half-day seminar at Portland State University (on Sept. 11, 2019) followed by a half-day field demonstration of field tests (on Sept. 12, 2019) of the NSF-RAPID Project CMMI-1935670 (Project title: RAPID Liquefaction Mitigation of Silts using MIDP and Field Testing with NHERI@UTexas Large Mobile Shakers, Project PI: Arash Khosravifar).

The overall objective of Project CMMI-1935670 is to evaluate the potential for microbially induced desaturation and precipitation (MIDP) via dissimilatory reduction of nitrogen to mitigate liquefaction potential in relatively fine-grained soils. 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 site selected for study is near the Critical Energy Infrastructure (CEI) hub located in northwest Portland, where 90% of the Oregon’s liquid fuel and all jet fuels for Portland’s airport are handled. The seismic vulnerability of fuel tanks at the CEI hub is a critical impediment to Oregon’s resilience and energy reliability in the wake of a major earthquake. The sensitivity of the fuel tanks to vibrations deterred the energy sector in the CEI hub from using conventional ground improvement methods, which are known to be intrusive; however, a bio-remediated technique that is less intrusive may be a viable solution; hence, this workshop.

The NHERI@UTexas Stiffness-based Ground Improvement Monitoring Workshop will highlight the potential use of NHERI@UTexas equipment for:

  1. direct-push, crosshole (DPCH) seismic testing to evaluate compression (P) and shear (S) wave velocities,
  2. in-situ shaking tests: small-to-medium strains, and
  3. long-term monitoring of compression (P) and shear (S) wave velocities.

Those with ideas about small, proof-of-concept tests that could piggyback on the workshop and be used to generate preliminary proposal data are encouraged to contact us in advance of the workshop. Please contact Farnyuh Menq (fymenq@utexas.edu), NHERI@UTexas Site Operations Manager, with any questions regarding the workshop, piggyback proof-of-concept tests, or the equipment facility.

Workshop Registration