Experimental and Numerical Study on the Influence of Plastic-Modified Concrete as Attenuation Layer on Explosion Effect

Reducing the damage of structures under stress wave is one of the popular and challenging issues in the field of protection engineering. In this study, the effect of plastic modified concrete as an attenuation layer on stress wave was investigated through large-scale explosion tests. The volume ratios of plastic particles used as replacement material were 2%, 4%, and 8%. Two explosions were used in each group to analyze the change of pressure under the plastic modified concrete as the attenuation layer. Experimental results showed that as low-impedance material, plastic particles can reduce the stress wave transmitted through the plastic modified concrete, and the elastic-plastic deformation of plastic increases energy consumption. Plastic modified concrete is more difficult to be compacted than loess attenuation layer. Thus, the clipping performance of the plastic modified concrete under the second explosion is better than that of the loess attenuation layer. The effect of plastic modified concrete on shortening the action time of stress wave is not obvious. Plastic modified concrete reduces damage by weakening the peak value of stress wave. The effects of explosive quantity, detonation distance, and plastic particle content on stress wave were studied through experiments and simulation. The propagation process of waves in the plastic modified concrete was studied via numerical simulation, and a fitting formula of wave cutting performance of plastic modified concrete was presented.