Abstract:Aiming at the problems of incomplete detonation of blasthole explosives, poor grooving effect and suspended roof in the blasting of a mine 's ore-gathering groove, ANSYS / LS-dyna software was used to carry out numerical simulation and field test on the blasting parameters of different diameter empty holes and 762 mm diameter empty holes. The results show that the 762 mm large diameter empty hole not only has the effect of 100 mm diameter empty hole, but also has more obvious stress concentration effect and stress waveguide direction effect than the 100 mm diameter empty hole, providing a larger free surface and compensation space. Moreover, if conditions permit, the number of empty holes required for 762 mm diameter empty hole blasting is less than that of conventional cut blasting, and its process is simpler ; according to the blasting cavity area of different cutting hole spacing and different auxiliary hole spacing, the optimal parameters of cutting blasting are determined as 0.95 m of cutting hole spacing and 0.88 m of auxiliary hole spacing. The numerical simulation results are applied to the field test, which reduces the specific charge explosives by 15 % and reduces the bulk rate to a certain extent. It plays a positive role in guiding mine production. The research results have certain significance for determining the cutting patio blasting well completion scheme and parameter selection.

Abstract: