Optimization and application of drilling and blasting parameters in Jinshan Gold Mine
In response to issues such as over-excavation,inadequate excavation footage,and excessive rock frag-mentation in the excavation and blasting of Jinshan Gold Mine,a blast funnel test was conducted at-155 m level to determine the range of blasting parameters.Using LS-DYNA numerical simulation software,a blast hole plugging model,stress cloud charts for different delay times,and full-section rock damage cloud charts were established to opti-mize the excavation and blasting parameters of Jinshan Gold Mine.Finally,field tests were conducted to verify the uni-versality of the optimized blasting parameters.The results show that the excavation and blasting parameters optimized for the entire section can meet the production requirements of the mine,with smooth excavation sections,concentrated blasting piles,uniform rock blocks,and stress wave superposition ensured for delay times below 100 ms.The average explosive consumption per unit volume of excavation and blasting decreased from 3.28 kg/m3 to 2.92 kg/m3,a decrease of 12.3%;and the unit volume consumption of detonators decreased from 2.28 units/m3 to 1.97 units/m3,a decrease of 15.4%.The blasting effect is good and can be widely applied in the mine.
roadway excavationblasting funnel testblasting parametersLS-DYNA numerical simulationdrill and blast method
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