Review of geomechanics data from French nuclear explosions in the Hoggar granite, with some comparisons to tests in US granite

Technical Report · Sun May 01 04:00:00 EDT 1983

DOI:https://doi.org/10.2172/6259770· OSTI ID:6259770

Heuze, F E

Numerous unclassified reports on the French nuclear explosions in the Hoggar (1961-1966) were reviewed from the standpoint of geomechanics. The following aspects of the tests are summarized: spectral content of the tests compared to U.S. results; shock front positions with time; cavity radius as a function of yield, coupling, density of rock, rock shear strength, and overburden; radial pressure, tangential pressure and peak velocity as a function of distance and yield; pressure vs. time at various distances; mechanical properties of granite; scaling laws for acceleration, velocity and displacement as a function of yield and distance for all Hoggar shots; extent of tunnel damage as a function of distance and yield; time to collapse of chimney as a function of yield, or cavity radius; extent of granite crushing and disking as a function of distance and yield cavity height relation to cavity radius; faulting and jointing on the Taourirt Tan Afella massif; and influence of water content on cavity radius vs. yield. Whenever possible, these French data are compared to corresponding data obtained in the U.S. granite events Hard Hat, Shoal, and Piledriver. The following results emerge from the comparison: (1) agreement is found between the French and U.S. experience for: mechanical properties of the granites, rock damage due to the blast, and yield-scaled peak values of acceleration, velocity and displacement; and (2) lack of agreement exists for: cavity size, chminey height, and time to cavity collapse. Average spacing of rock joints also was about 5 times greater in the Hoggar.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6259770
• Report Number(s): UCID-19812; ON: DE83012881
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450202* -- Explosions & Explosives-- Nuclear-- Weaponry-- (-1989)
58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BLAST EFFECTS
CAVITIES
COMPARATIVE EVALUATIONS
DOCUMENT TYPES
EUROPE
EXPLOSIONS
FRANCE
GRANITES
IGNEOUS ROCKS
MECHANICAL PROPERTIES
NORTH AMERICA
NUCLEAR EXPLOSIONS
PLUTONIC ROCKS
REVIEWS
ROCKS
UNDERGROUND EXPLOSIONS
USA
WESTERN EUROPE