August 23, 2023

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Jenny Ramirez Coauthors Article on Validation of an Energy-Based Pore Pressure Model for Liquefaction Assessments

Jenny Ramirez, PhD, (Ontario) coauthored “Validation of strain/energy-based pore pressure model in one-dimensional response analyses using centrifuge tests” in the Journal of Soil Dynamics and Earthquake Engineering.

Jenny 's coauthors are Marwan Khashila, Mourad Karray, and Mahmoud N. Hussien of Sherbrooke University; and Mohamed Chekired of Hydro-Quebec.

Jenny is a Project Professional at Geosyntec who conducts site characterization, data visualization, and numerical modeling to help design and assess dams, landfills, disposal containment facilities, and other earth structures. She also addresses task automation, geotechnical instrumentation interpretation, seismic response analyses, analyses of liquefiable soils, forensic analyses, and reconnaissance evaluations after natural disasters. As a member of the Geotechnical Extreme Event Reconnaissance (GEER) Association, Jenny visits and studies sites after major natural events to identify failure triggering and disaster consequences.

Soil Dynamics and Earthquake Engineering highlights the role of mechanics and other disciplines as they relate to earthquake engineering, publishing the work of applied mathematicians, engineers and other applied scientists involved in solving problems closely related to the field of earthquake engineering and geotechnical earthquake engineering.

The results of cyclic strain-controlled tests performed on reconstituted specimens of Ottawa sand F-65 using the combined triaxial simple shear (TxSS) apparatus were used to establish a strain/energy-based pore pressure model. The model was used in conjunction with the sigmoid function (SIG4) to simulate the cyclic behavior of Ottawa F-65 sand under stress and strain loading conditions. The model used FLAC at the element-level and in 1-D effective stress analysis. A counterpart set of cyclic stress-controlled direct simple shear (DSS) tests assessed the predictive capability of the numerical model to determine the liquefaction potential curves. Two dynamic centrifuge tests were simulated using the proposed model and Finn model, and a satisfactory comparison of the observed and computed responses in terms of pore water pressure generation at different depths was obtained. Furthermore, model validation was carried out by applying real earthquakes from the western United States to a hypothetical soil deposit and then comparing the liquefaction triggering according to published liquefaction charts. An agreement between the numerical results and the published charts confirms the applicability of the proposed strain/energy-based model in 1-D response analysis and liquefaction triggering assessment.

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About the journal: Soil Dynamics and Earthquake Engineering | Journal
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