Abstract: In order to optimize the appropriate delay interval and guide the control of production blasting parameters,the numerical simulation software was used to establish two-dimensional and three-dimensional numerical calculation models,and the influence of different delay intervals on the rock breaking amount was studied.The relationship between rock breaking amount and vibration velocity was studied,and field application tests were carried out.The study results showed that the blasting sequence of the front and rear rows of blast holes does not affect the optimal delay interval,but affects the final rock breaking amount.With the increase of the delay interval,the blasting rock volume shows a fluctuating trend,and when the delay time is 10 ms,the maximum rock breaking volume and larger vibration speed can be obtained.The two indicators of vibration speed and rock breaking volume should be comprehensively considered.Within the safe vibration speed range of buildings (structures),blasting rock volume should be given priority to improve production efficiency.After the field application,the blasting size is relatively uniform,which effectively verifies the feasibility and reliability of the optimal parameters.

Key words: delay interval,blasting rock volume,vibration velocity,numerical analysis,field test