Influence of Pre-split Fracture Width on Blasting Effect
A numerical model was established by using LS-DYNA software and then used to simulate the influence of pre-split fracture with width of 3 cm and 5 cm,respectively,on blasting effect.It is found that wider pre-split fracture can bring a better effect of blasting vibration attenuation,with the maximum amplitude decay rate of 46%.Based on pre-split blasting tests with different borehole sizes,the on-site vibration monitoring results have verified the correctness of the rule.It is concluded that the parameters of pre-split blasting should be selected based on the actual working conditions in consideration of protection of surrounding buildings.
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