Free-Field Code Predictions Versus Field Measurements: A Comparative Analysis for the Prairie Flat Event
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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The report documents the results of an airblast-induced ground-shock calculation performed at the U. S. Army Engineer Waterways Experiment Station WES for the Operation Prairie Flat 500-ton high-explosive HE event. A WES- modified version of the 2D axisymmetric LAYER Code developed by the Paul Weidlinger firm was used for the investigation. Each layer of the soil profile was mathematically modeled with a nonlinear elastic-plastic-compacting type constitutive model that provided good fits to the available material property test data. Field airblast measurements were used to develop an airblast routine suitable for code input. The code results, carried to 300 msec of real time, showed good quantitative and qualitative agreement with the field ground-motion measurements in regions outside the crater zone. The calculations reported herein represent initial efforts at WES to conduct comprehensive parametric studies of the effectiveness of contemporary mathematical constitutive models in predicting airblast-induced ground motions for several high-explosive field tests. The overall research program includes study of the influences of computational details such as boundary conditions, grid size, and time step and comparative analyses of the calculated ground motions and those recorded during the field test events.
- Soil Mechanics