OPERATION HARDTACK. Project 1.9. Loading on Buried Simulated Structures in High-Overpressure Regions.
Rept. for Apr-Oct 58,
KAMAN TEMPO SANTA BARBARA CA
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The objective of this project was to study some of the factors affecting the transmission of air-blast-induced pressure through soil and the loading produced on buried structures by such pressures in the high-pressure region approximately 250 psi. Factors studied were 1 the attenuation of pressure in a sand deposit when the water table is a few feet below the ground surface 2 the effect of duration of positive phase of blast on the pressure transmitted through such a soil 3 the effect of structure flexibility on the pressure acting on structures buried in such a soil and 4 the relationship between horizontal and vertical pressures in such a soil. The project employed 43 devices, each a rigid cylinder having one rigid end and one deformable-diaphragm end. The devices were buried at depths ranging from 0 to 20 feet at each of two locations at the Eniwetok Proving Ground. The locations were chosen to give a predicted ground surface overpressure of about 250 psi from each of two shots, Cactus and Koa. keywords NTPRNuclear Test personnel Review.