Laboratory Particle Velocity Experiments on Indiana Limestone and Sierra White Granite

Laboratory experiments were performed to determine the influence of freezing on the spherical wave generated by a small spherical explosive charge in rock. The work is relevant to the Soviet nuclear test site in Novaya Zemlya where permafrost conditions exist. The results are also valuable for devel...

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Bibliographic Details
Main Authors: Miller, S. A., Florence, A. L.
Other Authors: SRI INTERNATIONAL MENLO PARK CA
Format: Text
Language:English
Published: 1991
Subjects:
Geology
Geochemistry and Mineralogy
Soil Mechanics
Snow
Ice and Permafrost
Nuclear Explosions and Devices(non-military)
*NUCLEAR EXPLOSIONS
*FROZEN SOILS
*SPHERICAL WAVES
VELOCITY
LABORATORY TESTS
MODULUS OF ELASTICITY
ROCK
POROSITY
KINETIC ENERGY
SEISMIC VELOCITY
PERMAFROST
SEISMIC WAVES
LIMESTONE
FREEZING
SATURATED SOILS
GRANITE
DISPLACEMENT
USSR
INDIANA LIMESTONE
SIERRA WHITE GRANITE
PARTICLE VELOCITIES
PARTICLE DISPLACEMENTS
PE62101F
WUPL760009AS
Ice
Novaya Zemlya
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA248045
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA248045
Description
Summary:Laboratory experiments were performed to determine the influence of freezing on the spherical wave generated by a small spherical explosive charge in rock. The work is relevant to the Soviet nuclear test site in Novaya Zemlya where permafrost conditions exist. The results are also valuable for developing and validating material modeling in continuum mechanics codes used for source coupling calculations. The experiments were performed with cores of well characterized Indiana limestone (porosity 16%) under frozen/dry and frozen/ saturated conditions and well characterized Sierra White granite (porosity 0.8%) in a frozen/saturated condition. The spherical waves were determined by particle velocity measurements at several ranges. The effect of freezing was evaluated by comparing these results from our past room temperature experiments with the same rock type. From the particle velocities, we obtained displacements, reduced velocity and displacement potentials, spectra of these quantities, and radiated kinetic energy. The main conclusions are that freezing the dry limestone and saturated granite had no effect on the spherical waves. However, freezing of the saturated limestone had a substantial effect on the spherical waves. These effects included an increase of wave speed and reductions of maximum outward velocity, inward and outward phase durations, and displacements.

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