不耦合偏心装药结构爆破损伤破坏的分形研究

In order to study the blasting damage range and damage degree of eccentric decouple charge structure, using PMMA as experimental material, an eccentric blasting two-dimensional model experiment was designed. Through the digital image processing method, damage variables in different areas around the blasthole were calculated. Based on the box-count dimension theory, the fractal dimension of the cracks in different regions was calculated by MATLAB. Researches show that: ① The damage distribution of eccentric blasting shows significant asymmetry. The numerical relationship between the damage variables is: eccentric charge coupling side>center uncoupled charge structure>eccentric charge uncoupled side. ② Crack distribution accords with the fractal rule. The relative size of the fractal dimension is consistent with the damage variable. Fractal dimension can accurately characterize the damage of medium under blasting loading. ③ Through the regression analysis and linear fitting, the power function relationship between the damage variable and the fractal dimension is obtained. A corresponding damage prediction model is established.