Application of Deep Hole Blasting of Hard Rock with High Efficiency and Low Consumption in Xiadian Gold Mine
In order to solve the problems of low utilization rate of blasting hole and high cost of blasting in metal mine roadway blasting,and the problems of low tunneling level and high investment found in the field blasting investigation,a step cut blasting technique was proposed for deep hole blasting in hard rock roadway.The minimum resistance line of deep rock mass can be reduced,the explosive energy can be redistributed,and the explosive consumption can be reduced.By setting the delay time between holes,it is helpful to increase the transient free surface during blasting,increase the volume of rock broken by blasting,and increase the utilization rate of blasting holes.The field experiment results show that the blasting hole utilization rate can be increased to more than 91%,the explosive consumption can be reduced by 12.02%,and the blasting single-cycle footage can be increased by 47.52%.The research results provide guidance for the high-efficiency and low-consumption blasting construction of similar hard rock roadways.
hard rock roadwaydeep hole blastingstep cutblasting hole utilization rate
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