Study and Application of Slope Pre-cracking Blasting Technology with Wide Hole Spacing and Large Aperture
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.
pre-cracking blastingnumerical simulationwide hole spacinglarge apertureblasting and sewing
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