Accession Number : AD0876201

Title :   Evaluation of a Foxhole Cover.

Descriptive Note : Final rept.,

Corporate Author : ARMY MOBILITY EQUIPMENT RESEARCH AND DEVELOPMENT COMMAND FORT BELVOIR VA

Personal Author(s) : Leland, E. P.

Report Date : 06 NOV 1970

Pagination or Media Count : 53

Abstract : 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.

Descriptors :   (*UNDERGROUND STRUCTURES, PROTECTIVE COVERINGS), (*NUCLEAR EXPLOSIONS, DAMAGE ASSESSMENT), SIMULATION, TNT, BLAST, MEASUREMENT, DACRON, ANCHORS(STRUCTURAL), FAILURE(MECHANICS), TEST METHODS.

Subject Categories : Structural Engineering and Building Technology
      Protective Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE