Comparing U.S. and Russian experience with cavity decoupling in salt

Glenn, L. A.

doi:10.1029/93gl00975

Cited by 6 publications

(3 citation statements)

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“…ulated that the lower values measured forf at the same initial energy density as in Sterling might be explained by morphological changes (damage) to the walls caused by earlier repeated explosions in the same cavity[Glenn, 1993b]. For the pelletol explosion, curve 1 corresponds to the arrival of the air shock at the wall and curve 2 corresponds to the inertial loading of the explosive debris.…”

mentioning

confidence: 83%

“…It may very well be the case that the initial stress state surrounding the cavity is inelastic when the cavity has been formed by prior explosion. This was discussed by Glenn [1993b], who showed that a stable cavity can be maintained, with diminished yield strength near the cavity wall; this is accomplished via a pressure gradient in the damaged region, so that the overburden pressure does not extend right up to the cavity wall. This might have happened in the period prior to the Sterling event; however, our calculations indicate that by the time Sterling was fired, healing of the salt would have had to occurred and its strength increased, otherwise the amplitude measured would have been much higher.…”

Section: Effects Of Burial Depth and Yield Strength On Seismic Responsementioning

confidence: 99%

“…to the arrival of the air shock at the wall and curve 2 corresponds to the inertial loading of the explosive debris. ulated that the lower values measured forf at the same initial energy density as in Sterling might be explained by morphological changes (damage) to the walls caused by earlier repeated explosions in the same cavity[Glenn, 1993b]. The 2-year plus time period between Salmon and Sterling might have allowed the damaged salt to heal, whereas this would not be the case in Cowboy, where all the experiments were conducted over a 3-month period.…”

mentioning

confidence: 94%

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Seismic decoupling with chemical and nuclear explosions in salt

Glenn¹,

Goldstein²

1994

J. Geophys. Res.

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An extensive series of simulations was performed of underground explosions in salt, using both chemical and nuclear explosives. In both cases, the radius of the initial emplacement cavity was varied from the fully tamped configuration to as large as 80 m/kt⅓; when not fully tamped, the cavity was assumed initially to contain air at ambient temperature and pressure. In the nuclear source case, the simulations are shown to be in good agreement with the Salmon/Sterling events conducted by the United States and with recently released Russian data on a similar pair of explosions in an Azgir salt dome. Simulation of the U.S. Cowboy series of chemical explosions in a Louisiana salt mine are also shown to be in very good agreement with the experimental data; however, the constitutive model for the salt that best explains these data is different from that derived for Salmon; both salt models are amply supported by laboratory and field data. The main result of these simulations is that cavity decoupling with chemical explosives is much less efficient than with nuclear explosives. Although maximum decoupling factors, ƒmax, near 200 may be attainable with either of the two sources, the cavity size required to achieve this value appears to be >40 m/kt⅓. For cavity radii half as large, ƒmax is roughly 4 times lower with nuclear explosives, and lower by another factor of 4 with chemical sources. Moreover, if the initial cavity radius is a more modest 10 m/kt⅓, ƒmax < 3 even with a nuclear source.

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mentioning

confidence: 83%

Section: Effects Of Burial Depth and Yield Strength On Seismic Responsementioning

confidence: 99%

mentioning

confidence: 94%

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Seismic decoupling with chemical and nuclear explosions in salt

Glenn¹,

Goldstein²

1994

J. Geophys. Res.

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Regional Seismic Event Discrimination

Blandford¹

1996

Monitoring a Comprehensive Test Ban Treaty

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Scaled experiments of explosions in cavities

Grün

Cranch

Lunsford

et al. 2016

Journal of Applied Physics

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Consequences of an explosion inside an air-filled cavity under the earth's surface are partly duplicated in a laboratory experiment on spatial scales 1000 smaller. The experiment measures shock pressures coupled into a block of material by an explosion inside a gas-filled cavity therein. The explosion is generated by suddenly heating a thin foil that is located near the cavity center with a short laser pulse, which turns the foil into expanding plasma, most of whose energy drives a blast wave in the cavity gas. Variables in the experiment are the cavity radius and explosion energy. Measurements and GEODYN code simulations show that shock pressures measured in the block exhibit a weak dependence on scaled cavity radius up to ∼25 m/kt1/3, above which they decrease rapidly. Possible mechanisms giving rise to this behavior are described. The applicability of this work to validating codes used to simulate full-scale cavity explosions is discussed.

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Comparing U.S. and Russian experience with cavity decoupling in salt

Cited by 6 publications

References 9 publications

Seismic decoupling with chemical and nuclear explosions in salt

Seismic decoupling with chemical and nuclear explosions in salt

Regional Seismic Event Discrimination

Scaled experiments of explosions in cavities

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