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Title: Ground shock calculation parameter study. Report 3, Influence of type of constitutive model on ground motion calculations
Authors: Baladi, George Y.
Nelson, Ivan.
Keywords: Mathematical models
Shock waves
Soils--Plastic properties
Blast effect
Soil mechanics
Publisher: Soils and Pavements Laboratory (U.S.)
Series/Report no.: Technical Report;S-71-4, Report 3
Abstract: Abstract: This report is the third in a series, "Ground Shock Calculation Parameter Study," centered on the Prairie Flat Event. The first report describes the effect of different elastic-ideally plastic constitutive model formulations on calculated ground shock, while the second report describes the effect of different bottom boundary conditions. This report documents the results of a parameter study conducted to determine the effects of using different types of nonlinear constitutive models to fit a given set of soil property data in calculations of high-explosive (HE), airblast-induced, superseismic ground shock. A WES-modified version of the two-dimensional (2D) axisymmetric LAYER code developed by Weidlinger Associates, Consulting Engineers, was used for the calculations. A two-layer soil profile comprising a 33-ft-thick stratum of highly compressible yet fairly strong dry material (Material A) over a deep deposit of relatively stiff but extremely weak wet material (Material B) was used for the investigation. The properties specified for each of these two soil materials were mathematically modeled with four different types of nonlinear constitutive relations: (1.) a nonlinear elastic-ideally plastic 𝓋-G model (Hybrid), (2.) a variable moduli model (VM), (3.) an elastic-nonideally plastic model with a capped yield surface (CAP), and (4.) a nonlinear elastic-ideally plastic model with strain memory (SM).
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