Numerical Analysis and Application on the Parameters Optimization of Open-pit Deep-Hole Bench Loose Blasting

In order to improve the production efficiency of mine and ensure production safety and aiming at the unsatisfying blasting effects and uneven rock fragments existing in the exploitation blasting and construction process in Manjiazhai stope of Hualian Zinc and Indium Stock company, this paper analyzes and optimizes loosening blasting parameters of Open-pit deep-hole benches based on the blasting mechanism and engineering practical experience of wide hole distance and small resistance lines.Utilizing the numerical simulation of finite element software with ANSYS/LS-DYNA various schemes, analysis validations on the blasting stress field under different parameters are conducted.The simulation results show that: When the holes and rows spacing are 15×9, 16×9, 17×8, the effective stress of discrete cells between blast holes is bigger than the dynamic tensile strength that rocks can be broken.The site experimental investigation is conducted.The blasting effect assessment shows that the control rates of the big size rocks when the holes and rows spacing are 16×9 is 1.904% lower than those when those are 15×9, and 1.079% lower than those are 17×8.And the shovel mucking efficiency and composite economic results are better than that of the other two groups of parameters and confirmed the best blasting parameter design.