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Evaluation of a Foxhole Cover.
ARMY MOBILITY EQUIPMENT RESEARCH AND DEVELOPMENT COMMAND FORT BELVOIR VA
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A 1.8-pound foxhole cover, fabricated from uncoated woven dacron, was exposed to peak blast overpressures varying from 4 to 15 p.s.i. at the 500-ton TNT test blast in Operation PRAIRIE FLAT. Test structures were standard two-man foxholes oriented end-on and side-on to ground zero and a covered trench oriented side-on to ground zero. Earth cover was 18 inches over each unit, and a two-foot long open entrance was provided. The covers survived satisfactorily at the 13 p.s.i. level, but one of the two at the 15 p.s.i. level sustained a 20-percent failure. The connected units installed over the trench sustained a joint failure when snap fasteners loosened. Design changes were indicated for method of anchoring and method of connecting units in multiple. Structures oriented side-on to ground zero showed greater deformation than those oriented end-on to ground zero. It was concluded that the foxhole cover is satisfactory for two-man foxholes at peak pressures of 13 p.s.i. from a 500-ton HE blast.
APPROVED FOR PUBLIC RELEASE