The Impact of Bedrock Material Conditions on the Seismic Behavior of an Earth Dam Using Experimentally Derived Spatiotemporal Parameters for Spatially Varying Ground Motion
Paweł Boroń, Joanna Maria Dulińska
TL;DR
This study shows how the material of the bedrock beneath a dam affects its seismic behavior, using real data to improve safety assessments.
Contribution
The paper introduces site-specific spatiotemporal parameters to model spatially varying ground motion effects on earth dams.
Findings
Fractured bedrock parameters led to 24% higher stress reduction compared to uniform excitation.
Using site-specific parameters improves seismic safety evaluations of earth dams.
Higher incoherence in fractured rock causes greater desynchronization of ground motion.
Abstract
This study investigates the influence of bedrock material conditions on the seismic behavior of the Niedzica earth dam in southern Poland. It examines the dam’s dynamic response to a real seismic event—the 2004 Podhale earthquake—and evaluates how different foundation conditions affect structural performance under spatially varying ground motions. A spatially varying ground motion excitation model was developed, incorporating both wave coherence loss and wave passage effects. Seismic data was collected from three monitoring stations: two located in fractured bedrock beneath the dam and one installed in the surrounding intact Carpathian flysch. From these recordings, two key spatiotemporal parameters were experimentally determined: the seismic wave velocity and the spatial scale parameter (α), which reflects the degree of signal incoherence. For the fractured bedrock beneath the dam, the…
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Taxonomy
TopicsDam Engineering and Safety · Geotechnical Engineering and Underground Structures · Landslides and related hazards