Blasting damage of double cylindrical charges based on fractal theory

AbstractThis study investigates the superposition law of blasting damage between double cylindrical charges in PMMA through laboratory experiments and numerical simulation. The results showed that the evolution of blasting damage is consistent with fractal law. For a single cylindrical charge, the crushing area is distributed throughout the charge section, whereas the stemming section consists primarily of sparse cracks and contains no crushing area. The blasting damage peak between double cylindrical charges is concentrated between 5 and 12.5 times the borehole's diameter from the initiation point. The distance between the boreholes does not affect the damage pattern between double cylindrical charges.Keywords: Blastdamagefractal dimensiondigital image correlationPMMA Disclosure statementThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this article.Additional informationFundingThis research was supported by the National Natural Science Foundation of China (Grant no. 51934001), National Natural Science Foundation of China, Youth Science Foundation Project (Grant no. 52204085), and Foundation of State Key Laboratory of Safety and Health for Metal Mines (Grant no. 2021-JSKSSYS-03).