bursting layer

bursting layer

[′bər·stiŋ ‚lā·ər]
(ordnance)
Layer of hard material used in the roofs of dugouts or cave shelters; it sets off projectiles fused for short delay or immediate detonation before they can enter deeply enough to cause great destruction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.