Accession Number:

ADA261865

Title:

One-Dimensional Modeling of Ground Shock Propagation in a Spatially Random Geologic Media

Descriptive Note:

Technical rept.

Corporate Author:

NEW MEXICO STATE UNIV LAS CRUCES DEPT OF CIVIL ENGINEERING

Personal Author(s):

Report Date:

1993-03-01

Pagination or Media Count:

119.0

Abstract:

Field experiments have shown that scattering by random heterogeneity has a significant influence on explosively induced stress wave propagation. Physical models of stress wave propagation created by explosive tests are based on the traditional assumption that the subsurface geologic material can be divided into homogeneous layers. This simplistic approach may by responsible for much of the discrepancy which remains between observations from field experiments and computational results. Stochastic modeling techniques were applied to the problem of ground shock propagation through spatially random geologic media. Using these techniques, the spatial variability in the material model is defined by 1 the type of statistical distribution which defines the subsurface heterogeneity 2 the scale or correlation distance of the variability and 3 the mean and standard deviation of the material property under consideration. For the particular site under study, these statistical parameters have been estimated from cone penetrometer testing, laboratory material property testing, and seismic surveys. The statistical estimates of the properties are used in the stochastic modeling technique to modify the output of a random generator. the output, termed spatially random geologic variability factors in this study, was then incorporated into a finite difference ground shock code to simulate the subsurface in homogeneities.

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Seismology
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE