Ground Displacement Study.
Final project officers rept.,
BOEING CO SEATTLE WA
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Project LN 317, Ground Displacement Study, was conducted in conjunction with Operation Prairie Flat at the Defence Research Establishment, Suffield, Alberta, Canada, The Prairie Falt 500-ton spherical TNT shot, placed tangent to and above the surface, was detonated on 9 August 1968 at the Watching Hill Site. Measurements were made of the permanent displacement of cylindrical structures placed vertically in the soil adjacent to the detonation. These structures were 6 and 58-inch-diameter steel pipes of 10-, 14-, and 20-foot lengths placed along two azimuths. Stations were located at radial distances of 84, 105, 140, 195, 230, 280, 330, and 430 feet from ground zero. These distances were at equivalent predicted overpressures of 2,000, 1,500, 1,000, 600, 450, 300, 200, and 100 psi, respectively. The maximum tilt measured was 10.3 degrees for a 20-foot pipe located 84 feet from ground zero. The minimum tilt was less than 3 minutes for a station located 280 feet from ground zero. Maximum tilt at the nominal 200-psi distance was 1.5 degrees. Tilt directions were both toward and away from ground zero and consistency in direction and, to a lesser extent, in magnitude of tilt was apparent between the two radial arrays of pipes. Author
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