Modern Mining ›› 2024, Vol. 40 ›› Issue (03): 67-70.
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Aiming at the pre-cracking blasting condition of the slope of a chain-pass platform in a mining area，the reasonable parameters of the pre-cracking blasting network，charge structure and initia⁃ tion delay time were confirmed through theoretical analysis and combined with the actual situation on site. The two-hole pre-cracking crack model was established by LS-DYNA numerical simulation software and the process of the slope pre-cracking was simulated. Through the comparative analysis of the joint forming effect of several groups of models，it is found that the comprehensive effect of pre-cracking blasting with ap⁃ erture 120 mm and hole distance 1.5 m is the best，which is conducive to slope forming. Field blasting appli⁃ cation shows that the pre-cracking slope wall surface is smooth，the half-hole marks are clear，the continu⁃ ity of the hole marks is intact，the half-hole rate is about 75%，and the root of the palm surface reaches the pre-crackingt line. The blasting effect is good without secondary treatment，which proves that the pre-crack⁃ ing blasting technology of wide hole distance and large aperture slope has good effect in controlling slope forming，and provides a reference for similar projects.
