Accession Number : AD0752423

Title :   Ground Shock Calculation Parameter Study. Report 2. Effects of Various Bottom Boundary Conditions,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS

Personal Author(s) : Baladi,George Y.

Report Date : NOV 1972

Pagination or Media Count : 112

Abstract : A parametric study of the effects of rigid, roller, and transmitting bottom boundary conditions on high-explosive airblast-induced superseismic ground shock calculations was conducted using a WES-modified version of the two-dimensional (2D) axisymmetric LAYER code. The constitutive relation used was a nonlinear, elastic-plastic, hybrid-type model. The constitutive properties used were those of the two-layered soil profile employed in Report 1 of this series. Seven different calculations were performed to study the effects of the depth to the bottom boundary and the differences in ground shock resulting from the use of different types of boundaries at a given depth. Results of this study showed that the transmitting boundary provides an adequate simulation of an elastic medium beyond the calculation domain for a large class of finite difference 2D nuclear ground shock boundary value problems in elastic, inelastic, and layered media under superseismic conditions. (Author)

Descriptors :   (*SEISMIC WAVES, SOIL MECHANICS), (*NUCLEAR EXPLOSIONS, SHOCK WAVES), AIRBURST, STRESSES, STRAIN(MECHANICS), MATHEMATICAL MODELS

Subject Categories : Seismology
      Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE