Evaluation of Projectile Impact on Earth-Covered Structures

摘要

This report investigates the capability of earth-covered reinforced concrete structures to withstand the local response of impacting projectiles. Soil and concrete penetration, and thickness of concrete wall structures necessary to prevent perforation and scabbing, are predicted. The author examines the influence of parameters soil penetrability index, soil cover thickness, concrete compressive strength, concrete thickness and impact velocity on the local response. It is shown that for ranges of parameter values of interest soil penetrability index and soil cover thickness have the greatest influence on allowable missile weight (frontal pressure) at which incipient backface scabbing of the concrete wall occurs. The implementation of the results is demonstrated for data recorded from missile debris resulting from an actual aircraft shelter explosion experiment. The results indicate that nearly all data fall within safe limits of realizable parameter values. Implications for siting earth-covered structures with respect to aircraft structures are evident and suggestions for further research are indicated. (Author)