Abstract: To investigate the damage and failure characteristics of the double-hole blasting medium, theoretical analysis and model experiments are conducted in this study. Based on the analytical solution of the elastic plane strain problem in the double-hole blasting model, a theoretical model is established to study the evolution of the dynamic stress field during double-hole blasting. The model experiment study the damage of double-hole blasting by changing the distance between blast holes; the damage in different regions around the blast holes is analyzed by partitioned research and fractal dimension quantification. The study shows that: as the distance between the blast holes increases, the superposition effect of stress waves decreases, the radius of the crushing zone gradually increases, the number of cracks first decreases and then increases, and the average length of the main crack gradually increases; the damage along the direction of the blast hole connection gradually decreases, while the damage perpendicular to the direction of the blast hole connection gradually increases; a small hole spacing is conducive to the penetration of cracks between the holes and promotes cracks expansion along the direction of the blast hole connection; the damage variables in the left and right regions of the specimen gradually increase, while the damage variable in the central region reaches a minimum value when the blast holes spacing is 50 mm; the damage variables in zones I and II first decrease and then increase, where the damage variable in zone III gradually decreases; the damage variable distribution in the polar coordinate system shows that zone I exhibits a uniform damage pattern, and zone II gradually transitions from an elliptical to a circular distribution. Based on the relationship between the fractal dimension of the damage area and the damage variable, a fractal damage model for double-hole blasting of poly(methyl methacrylate) (PMMA) material is constructed.