The charge structure and the relative spacing pattern parameters of presplitting blasting were optimized based on LS-DYNA software.The hole spacing of the presplitting hole was adjusted from 1.3 m to 1.5 m,and the method that the presplitting holes exploded together was adopted.No.2 rock emulsion explosive with the specification of Φ90 mm-3 000 g was selected,and the explosive rolls were divided into two parts along with the axial centerline for use.The axial decoupling charge coefficient was increased from 1.33 to 2.67 at the current,and the charge section of the presplitting holes was adjusted,so the energy distribution of explosive material inside holes was more reasonable.Finally,the numerical modeling results were applied in actual production,the on-site presplitting blasting tests were developed on hornstone lithology area of the open-pit.The half porosity reached more than 85％,the pumice stone of the slope crest was reduced largely,and the presplitting blasting results were better.
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