Abstract: A similarity model of internal explosion in multilayer concrete is established based on dimensional analysis for researching the similarity law of explosion in multilayer concrete. The influences of charge depth and scale ratio on the similarity of damage pattern and damage parameters of prototype and scale model were analyzed by LS-DYNA code. The similarity tests of internal explosion damages of TNT and aluminized explosive were carried out in the prototype and the scale model with scale ratio of 1/2. The results show that the damage patterns of prototype and scale model are the same at different charge depths. When the boundary constraint of a target is the same, the damage of aluminized explosive is similar in the prototype and the 1/2 reduced-scale model. After the normalization of scaled damage parameters, the deviation of the prototype is less than 8%. The deviation degree between the damage parameters of reduced-scale model and prototype is increased with the decrease in scale ratio. The damage effect of internal explosion of the prototype can be predicted by using the test results of appropriate scale ratio model. Key

Key words: multilayerconcretemedium, internalexplosion, similaritylaw, scaleexperiment