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WITHDRAWN Liquefaction and Ground Failure Considerations During Long-duration, Subduction Zone Earthquakes

Description: 

WITHDRAWN Recent efforts by researchers, governmental organizations, and engineers have focused on studying and mitigating the effects of long-duration, large-magnitude earthquakes, such as those originating from the Cascadia subduction zone in the Pacific Northwest. However, a persistent challenge for geotechnical engineers remains: case histories and research studies on liquefaction triggering and ground failure have primarily focused on lower-magnitude earthquakes due to their higher frequency of occurrence. These data have informed simplified triggering procedures and served as validation data for non-linear effective stress numerical models. Recently, this has created challenges for high-risk and complex projects, where state-of-the-art numerical models often predict deformations larger than previously recorded, leading to costly remediation designs. Without validation data and a sound understanding of how liquefaction triggers and ground failure accumulates during long-duration, large-magnitude earthquakes, engineers are left with limited options.

In this presentation, we share the results from a centrifuge experimental testing program designed to study the effects of long-duration, large-magnitude earthquake shaking on a gently sloping submerged deposit of Ottawa F-65 sand at a relative density of 65%. The ground motions used in the study were selected based on their intensity parameters and source conditions to evaluate the factors contributing to liquefaction triggering and deformation. The experimental findings demonstrated that the velocity of the ground motion and cumulative energy are strong predictors of liquefaction triggering and slope deformations. We conclude the presentation by discussing how findings will aid engineers through improving analysis tools and providing a benchmark dataset of system-level experiments for numerical and analytical model validation efforts.

Session: Earthquake-triggered Ground Failure: Data, Hazards, Impacts and Models - I

Type: Oral

Date: 4/17/2025

Presentation Time: 08:45 AM (local time)

Presenting Author: Trevor

Student Presenter: No

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