Microfracturing in postshot Gasbuggy core gb-3
Microfracturing in shocked sedimentary rocks near to the 29-kt Gasbuggy nuclear explosion has been microscopically examined in samples from post-shot core (Hole GB-3). Of 4 reentered or drilled postshot holes, GB-3 makes the closest approach to the shot point (198 ft radial distance or approx. 2.47 times the cavity radius). The amount of fracturing in rock more than 200 ft from the shot point is small and shows little correlation with distance. Calculated maximum peak stresses for the rock are in the 6 to 8 kb range and are below the laboratory- measured yield strengths. Comparison of shock effects in brittle granodiorite and in the semi-brittle Gasbuggy rocks at the same peak radial stresses indicates that matrix fracturing in the granodiorite is many times greater than in the Gasbuggy rocks. It points up the important role played by weak, ductile cementing minerals in the latter in determining the mode of yielding of the whole.
- Research Organization:
- Calif Univ, Livermore
- OSTI ID:
- 5721432
- Journal Information:
- Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 11:3; ISSN NUTYB
- Country of Publication:
- United States
- Language:
- English
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Microfracturing in postshot Gasbuggy rocks
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