Simulation experiment research on optimization of differential delay time between step blasting holes
In order to explore the influence of inter hole delay time on the blasting effect in open-pit bench blasting engineering,based on the theory of stress wave and explosive gas interaction,a dual borehole three-dimensional solid model was established to compare the changes in rock mass stress,kinetic energy,and fragmentation morphology under different inter hole delay times.The relationship between delay time and rock mass blasting fragmentation effect was explored,The method for selecting delay time was optimized by introducing rock integrity coefficient and validated through on-site experiments.The results show that if the delay time between holes is too small or too large,it is not conducive to the full utilization of blasting energy,and there exists a delay time between holes with the best blasting effect;The reasonable inter hole delay time obtained from numerical simulation and theoretical calculation is basically consistent.Combined with the rock integrity performance of on-site tests,the modified delay time selection method has good applicability.After optimizing and adjusting the blasting parameters on site,the blasting block rate has been reduced by more than 50%,providing strong reference for determining the reasonable delay time on site.
万方数据
维普
