Experimental investigation on penetration of prefragment into protective door

With the wide use of precision guided weapons, the entrance of underground engineering is likely to be struck by the deep penetration weapons, and the protective doors are encountered with threat from high-speed fragments. The experiments were carried out, in which common reinforced concrete (RC) and reactive powder concrete (RPC) protective doors are tested by high-speed fragments. The fragments were shot by a fragment generator. It is indicated that the fragment generator is able to shot multiple fragments at an anticipated velocity, and the fragments are reasonably distributed, which satisfies the requirements of experimental design. It is found that the protective doors made of RPC perform higher protective capability against fragment penetration than that of common RC. With the same parameters of fragments, common RC door of 120 mm thickness is completely perforated, while the depth of penetration in RPC door is only 65 mm.