Abstract
A seismic attenuation and air overpressure study was conducted to determine the attenuation of explosion induced ground motions and air overpressures as a function of distance from shallow subsurface detonated charges, and to derive parameters to predict blast effects at distances beyond the ordinance disposal facility boundary. A total of 210 explosive shots were monitored producing 2048 time histories of ground motions recorded in the vertical, radial, and transverse directions, in addition to recording air overpressures. The data were analyzed for peak particle velocities and peak air overpressures, then plotted versus scaled range. A best fit line was determined for the data to give average, 95% non-exceedance, and upper bound predictive equations which can be used in the disposal operations to avoid damage to adjacent structures.
Highlights
The disposal of ordinance and other dangerous materials by explosive detonation provides many advantages, one concern that is always present is insuring that damage is avoided to nearby structures
The maximum unfiltered peak particle velocity detected by each geophone at each station from each test was determined and plotted versus scaled range for both square and cube root scaling
A study was completed to determine the attenuation of explosion induced ground motions and air overpressures as a function of distance from subsurface detonated charges, and to develop parameters to predict motions at distances beyond the facility boundary
Summary
The disposal of ordinance and other dangerous materials by explosive detonation provides many advantages, one concern that is always present is insuring that damage is avoided to nearby structures This concern is addressed by setting conservative operational parameters, e.g., charge size, and permitting weather conditions, that will result in blast effects that pose no threat to these structures. The purpose of this study was twofold: (1) determine the attenuation of explosion induced ground motions and air overpressures as a function of distance from subsurface detonated charges; (2) develop procedures to predict ground particle velocities and air overpressures at distances beyond the base boundary The development of these prediction procedures will allow the facility to determine the blast effects as a function of explosive size (charge weight) at a given distance and using safe blasting criteria assess the potential for off-site structural damage or complaints
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