Effects of Closing Blocks on Hazard Areas
Abstract
A series of tests were conducted with reduced scale magazines to study the blast reduction effectiveness of closing blocks placed at the entrances of storage chambers of underground ammunition storage magazines. Five small-scale magazines were made of reinforced concrete to investigate design features affecting the effectiveness of closing blocks. Three intermediate-scale magazines were constructed in hard rock to know the effectiveness of the blocks in magazines larger than the small-scale ones in real rock. Pressure-time histories measured in the free field were analyzed, and the blast-hazard area of each magazine was calculated according to the procedures of DoD explosive safety regulation. In our small-scale tests, the relative hazard area was strongly dependent on the chamber loading density and the areal density of the closing blocks, showing that the relative hazard area decreases with increasing chamber loading density and with decreasing areal density. We made some assumptions on the motion of closing blocks of our small-scale tests. It was shown that the relative hazard area was reduced by the increase in the initial acceleration, which was inversely proportional to the closing time. We obtained the equation representing the relative hazard area as a function of initial acceleration. All three of the intermediate-scale magazines worked effectively: The hazard area for each magazine was reduced to about 10% of that calculated according to the procedures of the DoD safety regulation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1994
- Accession Number
- ADA519931
Entities
People
- Jae Woon Ahn
- Jin Soo Choi
- Jong Hun Park
- Seong Won Cho
- So-yong Song
- Yong Sung Jeon
Organizations
- Agency for Defense Development