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Dihest Development Tests Minidihest I and II, Planewave I and II.
Rept. for June 67-Jan 69,
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
Pagination or Media Count:
MINIDIHEST I and II in soil and PLANEWAVE I and II in rock were the first efforts toward the development of a technique to simulate the direct-induced ground motions resulting from a nuclear detonation. Buried vertical arrays of high explosives were simultaneously detonated and used as energy inputs to the experiments. Resulting ground motions were monitored with combinations of velocity, acceleration, strain, and time-of-arrival gages positioned at various ranges and depths. The in-situ material properties of the sites governed the propagation characteristics of the stress waves. Moduli and corresponding stress wave velocities increased with increasing depth. Stress wave amplitudes decreased with increasing range. Part of this decrease was due to geometric energy dispersion and part of energy attenuation in the propagation medium. A semi-empirical technique was used to evaluate and make predictions for the tests in rock. Author
APPROVED FOR PUBLIC RELEASE