In order to determine the degree of impact of blasting vibrations on main haulage roadways and surface buildings near an underground mine, and to control these effects, it is necessary to obtain field test data through industrial experimentation. The Blast-NET blasting monitoring instrument was first used to monitor the radial, tangential, and vertical vibration velocities and frequencies caused by the blasting. According to the Sadovsky formula, the K and α values related to geological conditions were calculated using single-factor regression analysis, and the actual blasting vibration velocity calculation formula was obtained. The reliability of the calculation formula was then verified through continuous vibration monitoring, and optimization experiments were conducted on three different blasting network configurations: row-by-row, segmented, and hole-by-hole. The research results showed that if the protection of surface buildings is considered, the minimum safe distance between the source of the explosion and the protected buildings is 250 meters, 200 meters, and 125 meters respectively for row-by-row, segmented, and hole-by-hole blasting. If the protection of underground haulage roadways is considered, the minimum safe distance between the source of the explosion and the protected roadways is 30 meters, 25 meters, and 25 meters respectively for row-by-row, segmented, and hole-by-hole blasting. Finally, it is concluded that when the predicted vibration velocity meets the requirements of row-by-row or segmented blasting, the mine can use nonel detonators for blasting. If the hole-by-hole blasting network is required, only digital electronic detonators or high-precision nonel detonators can be used.

underground mine  /  blasting vibration monitoring  /  buildings (structures) in blasting area  /  millisecond blasting