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OPERATION SUNBEAM, SHOT SMALL BOY. Project Officer's Report - Project 1.3. Underground Stress Measurements,
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
Project 1.3 attempted to measure dynamic stress and strain induced in the earth by the passage of an airblast wave over the surface with the aid of a newly developed stress gage. An array of omnidirectional velocity-sensitive switches was also include in an attempt to distinguish between, and measure, the propagation velocities of the peak compression and shear stress fronts induced by the airblast in the earth. Due to radiation effects produced by the detonation, the stress gages failed to give any usable stress or strain data. The time-of-arrival switch array performed satisfactorily, and compressional wave velocity data is presented together with calculations of constrained modulus for Frenchman Flat soil. Flexible casing was also installed at several ranges close to ground zero for measurement of permanent ground deformation. Data on permanent horizontal and vertical movement with depth is presented.
Extracted version of report dated 2 Mar 65.