United States Department of Transportation
i
Evaluation of Liquefaction Induced Lateral Spread from Recent Alaska Earthquakes
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2023-06-01
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[PDF-19.98 MB]
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Abstract:Widespread liquefaction and lateral spreading occurred after the 2002 M7.9 Denali fault earthquake. This provided a unique opportunity to evaluate lateral spreading displacement equations to areas of interior Alaska. The Newmark block analysis method and nonlinear solid-fluid coupled finite element models were used to assess the impact of seasonal ground crust on two locations from the earthquake. Historical geotechnical explorations, photographs, topographic surveys, boreholes and lab results were used to compare the performance of the lateral spreading displacement prediction equations. Results show the current semi-empirical and Newmark block models can reliably predict lateral spreading displacements for embankment-style slope geometries, while the empirical equations can more reliably predict displacements at generally sloping to flat sites. These findings show that current lateral spreading prediction equations are applicable in areas with or without a frozen crust at the surface as governed by the site geometry.
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