Abstract:

In order to overcome the shortcomings of large diameter deep hole millisecond blasting in

underground mine，according to the theory of wave theory，based on the attenuation law of stress propaga⁃

tion of single hole blasting with cylindrical charge，the range of initiation hole distance and delay time be⁃

fore and after millisecond blasting are delineated，and the superposition stress field function of two hole mil⁃

lisecond blasting is further deduced.On this basis，the calculation formula of hole network parameters and

delay time is deduced according to Mises criterion.The rationality of the theoretical analysis was verified by

comparing the stress field distribution and the actual blasting effect through LS-DYNA simulation calcula⁃

tion and field industrial test.

Key words:

deep hole blasting in stope, millisecond blasting, blasting stress field, blasting parameters