MOTION OF SUBSURFACE SOIL INCLUSIONS SUBJECTED TO SURFACE BLAST LOADING.
Rept. for Sep 62-Dec 64,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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An experimental investigation was conducted to provide an insight into the fundamental motion characteristics of inclusions buried in a soil field and subjected to a blast loading applied to the surface of the soil. The purpose of the work was to provide knowledge of those factors influencing the failure of an underground protective complex composed of structures, utility lines, communication lines, appurtenances, etc. Dissimilar inclusions, representing elemental portions of a buried complex, were placed at different depths within a dry sand material compacted into a reinforced-concrete container. A sequence of 15 blast loadings at overpressure levels of 5 to 25 psi were applied to the surface of the sand, and the acceleration and displacement of the inclusions and the displacement of the soil were measured. The experimental results indicate that the inclusions do not move with the surrounding soil but displace into the soil in the direction of the propagating soil stress wave. Stiffer inclusions attained the greatest acceleration, velocity, and displacement inclusion-soil differential displacements of up to one-third the maximum inclusion displacement were recorded. Author