Accession Number : AD0722403

Title :   Free-Field Code Predictions Versus Field Measurements: A Comparative Analysis for the Prairie Flat Event

Descriptive Note : Final rept.

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : Zelasko, Joseph S ; Baladi, George Y

PDF Url : AD0722403

Report Date : Mar 1971

Pagination or Media Count : 66

Abstract : 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.

Descriptors :   *EXPLOSION EFFECTS, *NUCLEAR EXPLOSIONS, AIRBURST, CURVE FITTING, HYDROSTATS, SHEAR STRESSES, SIMULATION, SOIL MECHANICS, STRAIN(MECHANICS)

Subject Categories : Soil Mechanics
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE