Seismic characteristics of cavity decoupled explosions in limestone: An analysis of Soviet high explosive test data

Murphy, John; Kitov, Ivan; Rimer, N.; Adushkin, V. V.; Barker, B. W.

doi:10.1029/97jb02475

Cited by 13 publications

(28 citation statements)

References 9 publications

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“…These eects are schematically illustrated in Figure 8 where the interactions between the expanding gas bubble and the re¯ected shocks from the cavity wall are shown for reference purposes. We have attempted to theoretically model this complex process with a series of one-dimensional, nonlinear ®nite dierence simulations of explosions in a purely spherical, 28.9 m radius, water-®lled cavity in salt (STEVENS et al, 1991;MURPHY et al, 1997). Lithostatic pressure at the 597 m depth of the Azgir cavity is roughly 120 bars.…”

Section: Theoretical Simulation Analysismentioning

confidence: 99%

“…The calculations were initialized with the device energy uniformly distributed in a water volume that gives an average initial pressure of 80 kilobars, sucient to vaporize the required amount of water during the bubble expansion (MURPHY et al, 1997). Parametric calculations indicate that a substantially smaller initial bubble results in approximately the same computed spectra while a signi®cantly larger initial bubble (a lower initial pressure) does not model the steam bubble behavior well and greatly changes the results of interest.…”

Section: Figurementioning

confidence: 99%

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Seismic Source Characteristics of Nuclear Explosions in Water-filled Cavities

Murphy

Sultanov

Rimer

et al. 2001

Pure appl. geophys.

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Ð During the period from 1975 to 1979, the former Soviet Union conducted a series a six nuclear explosions in a water-®lled cavity in salt which was created in 1968 by a tamped 27 kt explosion at a depth of 597 m at the Azgir test site at the north end of the Caspian Sea. Broadband, near-regional seismic data recorded from these tests have been processed and analyzed in an attempt to characterize the seismic source characteristics of these explosions and assess their relevance to the cavity decoupling evasion scenario. The results of these analyses indicate that the explosions in the water-®lled cavity were not decoupled, but rather show evidence of enhanced seismic coupling with respect to that which would be expected from tamped explosions of the same yields in salt. Theoretical ®nite dierence simulations of these tests have been conducted in which the complex, nonlinear interactions between the shock eects in both the water and surrounding salt medium have been explicitly modeled. The results of these simulations indicate that the most prominent yield dependent features of the observed seismic source functions can be largely explained by the dynamic interactions between the expanding and contracting steam bubbles generated by the explosions in water and the shock-wave re¯ections from the cavity wall. More speci®cally, it has been found that the shock-wave re¯ection from the cavity wall retards the expansion of the steam bubble in a yield dependent fashion relative to that expected in the open ocean, resulting in a smaller maximum bubble radius and a shorter bubble oscillation period.

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Section: Theoretical Simulation Analysismentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Seismic Source Characteristics of Nuclear Explosions in Water-filled Cavities

Murphy

Sultanov

Rimer

et al. 2001

Pure appl. geophys.

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“…The second one is an underground test described in Ma et al (1998). And, the last one is a series of HE cavity decoupling tests in limestone performed in Kirghizia in 1960 (Murphy et al, 1997). The limestones encountered in these tests have different porosities (12%, 2% and 0.5%), therefore modeling the three tests with a single set of parameters presents significant challenge.…”

Section: Simulations Of Wave Propagation Induced By Spherical Explosionsmentioning

confidence: 98%

Generic strength model for dry jointed rock masses

Vorobiev

2008

International Journal of Plasticity

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“…Using in situ model with extra 0.5% of joint porosity (thick lines) gives better agreement with the experiment compared to the intact model (thin lines). Simulations performed by Murphy [21] showed significantly overestimated peak velocities. As far as the tamped test is concerned, the calculations seem to underestimate both the peak velocity and displacement especially at the long ranges.…”

Section: Summary Of the Current Approachmentioning

confidence: 99%

“…The second one is an underground test described in [20]. And, the last one is a series of HE cavity decoupling tests in limestone performed in Kirghizia in 1960 ( [21]). The limestones encountered in these tests have different porosities (12%, 2% and 0.5%), therefore modeling the three tests with a single set of parameters presents significant challenge.…”

Section: Summary Of the Current Approachmentioning

confidence: 99%

Advanced discrete-continuum methods for dynamic loading of tunnels by ground shocks

Vorobiev¹

2013

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Seismic characteristics of cavity decoupled explosions in limestone: An analysis of Soviet high explosive test data

Cited by 13 publications

References 9 publications

Seismic Source Characteristics of Nuclear Explosions in Water-filled Cavities

Seismic Source Characteristics of Nuclear Explosions in Water-filled Cavities

Generic strength model for dry jointed rock masses

Advanced discrete-continuum methods for dynamic loading of tunnels by ground shocks

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