关键词: 不耦合装药, LS-DYNA, 不同水量, 混凝土模型, 预裂爆破

Abstract: In order to study the mechanism of pre-splitting blasting damage under different water yield condition，the theoretical analysis of the uncoupled charge blasting of air and water is carried out based on the existing blasting theory，and it is concluded that the initial hole pressure of uncoupled charge in air and water medium were obtained separately.Based on this，the 3d double holes uncoupling blasting model is established by LS-DNAY（nonlinear finite element） dynamic analysis software.The initial compressive stress of the borehole walls under different water yield was analyzed under the same non-coupling charge structure.According to the Von Mises failure criterion，the effective stress evolution process at the concentric line of blasting hole.The test of uncoupling charge blasting of concrete specimen based on the theory and numerical simulation was carried out.The results showed that under the same charge conditions，the smaller amount of water in blasting hole，the smaller initial pressure at the blast hole wall，the smaller effective stress on the concentric line of the blast hole，and the better flatness the splitting surface.Meanwhile，when the air and water are mixed with uncoupled charge，the flatness of pre-splitting surface of air is better than that of water.

Key words: Uncoupled charge, LS-DYNA, Different amounts of water, Concrete model, Pre-splitting blasting