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Numerical simulation of stress wave propagation from underground nuclear explosions

Abstract

This paper presents a numerical model of stress wave propagation (SOC) which uses material properties data from a preshot testing program to predict the stress-induced effects on the rock mass involved in a Plowshare application. SOC calculates stress and particle velocity history, cavity radius, extent of brittle failure, and the rock's efficiency for transmitting stress. The calculations are based on an equation of state for the rock, which is developed from preshot field and laboratory measurements of the rock properties. The field measurements, made by hole logging, determine in situ values of the rock's density, water content, and propagation velocity for elastic waves. These logs also are useful in judging the layering of the rock and in choosing which core samples to test in the laboratory. The laboratory analysis of rock cores includes determination of hydrostatic compressibility to 40 kb, triaxial strength data, tensile strength, Hugoniot elastic limit, and, for the rock near the point of detonation, high-pressure Hugoniot data. Equation-of-state data are presented for rock from three sites subjected to high explosive or underground nuclear shots, including the Hardhat and Gasbuggy sites. SOC calculations of the effects of these two shots on the surrounding rock are compared with the  More>>
Authors:
Cherry, J T; Petersen, F L [1] 
  1. Lawrence Radiation Laboratory, University of California, Livermore, CA (United States)
Publication Date:
May 01, 1970
Product Type:
Conference
Report Number:
CONF-700101(vol.1); INIS-XA-N-228
Resource Relation:
Conference: Symposium on engineering with nuclear explosives, Las Vegas, NV (United States), 14-16 Jan 1970; Other Information: 12 refs, 38 figs; PBD: May 1970; Related Information: In: Symposium on engineering with nuclear explosives. Proceedings. Vol. 1, 871 pages.
Subject:
42 ENGINEERING; CALCULATION METHODS; EQUATIONS OF STATE; GEOLOGIC FRACTURES; NUCLEAR EXPLOSIONS; ROCKS; STRESS ANALYSIS; UNDERGROUND EXPLOSIONS; WAVE PROPAGATION
OSTI ID:
20555812
Research Organizations:
American Nuclear Society, Hinsdale, IL (United States); United States Atomic Energy Commission (United States)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
TRN: XA04N0748010786
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
page(s) 142-220
Announcement Date:
Feb 20, 2005

Citation Formats

Cherry, J T, and Petersen, F L. Numerical simulation of stress wave propagation from underground nuclear explosions. IAEA: N. p., 1970. Web.
Cherry, J T, & Petersen, F L. Numerical simulation of stress wave propagation from underground nuclear explosions. IAEA.
Cherry, J T, and Petersen, F L. 1970. "Numerical simulation of stress wave propagation from underground nuclear explosions." IAEA.
@misc{etde_20555812,
title = {Numerical simulation of stress wave propagation from underground nuclear explosions}
author = {Cherry, J T, and Petersen, F L}
abstractNote = {This paper presents a numerical model of stress wave propagation (SOC) which uses material properties data from a preshot testing program to predict the stress-induced effects on the rock mass involved in a Plowshare application. SOC calculates stress and particle velocity history, cavity radius, extent of brittle failure, and the rock's efficiency for transmitting stress. The calculations are based on an equation of state for the rock, which is developed from preshot field and laboratory measurements of the rock properties. The field measurements, made by hole logging, determine in situ values of the rock's density, water content, and propagation velocity for elastic waves. These logs also are useful in judging the layering of the rock and in choosing which core samples to test in the laboratory. The laboratory analysis of rock cores includes determination of hydrostatic compressibility to 40 kb, triaxial strength data, tensile strength, Hugoniot elastic limit, and, for the rock near the point of detonation, high-pressure Hugoniot data. Equation-of-state data are presented for rock from three sites subjected to high explosive or underground nuclear shots, including the Hardhat and Gasbuggy sites. SOC calculations of the effects of these two shots on the surrounding rock are compared with the observed effects. In both cases SOC predicts the size of the cavity quite closely. Results of the Gasbuggy calculations indicate that useful predictions of cavity size and chimney height can be made when an adequate preshot testing program is run to determine the rock's equation of state. Seismic coupling is very sensitive to the low-pressure part of the equation of state, and its successful prediction depends on agreement between the logging data and the static compressibility data. In general, it appears that enough progress has been made in calculating stress wave propagation to begin looking at derived numbers, such as number of cracks per zone, for some insight into the effects on permeability. A listing of the SOC code is appended. (author)}
place = {IAEA}
year = {1970}
month = {May}
}