Aiming at anti-explosion design in defense engineering, attenuation mechanism and evolution law of stress waves in defense layer with cavities or cylindrical shells embedded were investigated. Based on theoretical analysis and numerical simulations, it was found that dispersion and diffraction of stress waves occur near by surfaces of cavifies or cylindrical shells, they significantly weaken the strength of stress waves undernearth cavities or shells, and the structure with cylindrical shells embedded has better protection than the structure with cavities embedded. Numerical calculations for different radius of shells were preformed. The results showed that the protect effect and scope raise with increase in the radius of shells; and when several shells are horizontally equispacedly arranged in defense layer, the stress peaks of the measured points are obviously less than the minimum of stress peaks of the corresponding measured points in the structure with a single cylindrical shell embedded. The results provided a theoretic basis for design of advanced defense layer in anti-explosion engineering.%以防护层中新型抗爆工程设计为背景,对含孔穴或柱壳混凝土介质中应力波的衰减和演化规律进行理论和数值分析.经过分析和数值计算发现,应力波在孔穴或柱壳表面附近呈现明显的弥散和绕射现象,此两种结构对下方的应力波有显著的削弱作用,但柱壳结构在防护效果上明显优于孔穴结构.同时,针对不同半径的柱壳结构进行数值计算,结果表明:随着柱壳半径的增大,结构的削波性能和防护范围得到提高;当将多个柱壳水平等间隔的进行排列时,其下方各测点的应力峰值基本相等,且明显小于单个柱壳时其下方各相应测点应力峰值的最小值.其结果为在抗爆防震工程中科学的防护层的设计提供了一定的理论依据.
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