Materials for Use in Mitigating Blast Loads on Deeply Buried Protective Structures
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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The structural design of deeply buried protective structures to resist the effects of nuclear blast loading is somewhat simplified if the structure can be designed to resist a defined, constant or quasi- constant stress level when shock-loaded. By backpacking a buried structure with certain types of materials, a constant stress level can be obtained when a shock wave is transmitted through the backpacking to the structure. An analysis of the desired behavior of the material accompanied by existing theories and postulates pertaining to the use of backpacking materials resulted in the defining of a variety of materials that could conceivably be used as backpacking materials. Materials that were considered included light-weight concretes, foamed plastics, honeycombs, and natural aggregates. These materials were evaluated as to their physical properties and behavior, availability, and emplacement procedures and costs. Based on the results of these evaluations, three of the materials investigated are currently being utilized in an actual nuclear blast field test using prototype structures.
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