Effectiveness of Portal Barricades for Underground Storage Magazine

To investigate a new method which can reduce hazard distance by accidental explosion in underground ammunition storage facilities, several hazard reducing devices were reviewed. And the portal barricade in front of the portal was one of the IBD reducing devices studied. To investigate the effectiveness of portal barricades, a series of tests were conducted with concave shape portal barricades. It is found that concave shape portal barricades deflect blast wave exiting from the portal to upward direction, the blast pressures along the extended centerline axis of the tunnel are decreased, and IBD area is similar to a circle centered at the portal. IBD reduction along the centerline axis of the tunnel by the concave shape portal barricades is more than 55%. Airblast reducing effects as a function of side angle, height angle of the portal barricade and stand-off distance from the portal were also analyzed. Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. 1. REPORT DATE AUG 1996 2. REPORT TYPE 3. DATES COVERED 00-00-1996 to 00-00-1996 4. TITLE AND SUBTITLE Effectiveness of Portal Barricades for Underground Storage Magazine 5a. CONTRACT NUMBER