MAN Ke, LIU Xiao-li. THE EFFECT OF SURROUNDING EMPTY HOLES ON THE BLASTING VELOCITY AND DAMAGED ZONES[J]. Engineering Mechanics, 2020, 37(11): 127-134. DOI: 10.6052/j.issn.1000-4750.2019.12.0790
Citation: MAN Ke, LIU Xiao-li. THE EFFECT OF SURROUNDING EMPTY HOLES ON THE BLASTING VELOCITY AND DAMAGED ZONES[J]. Engineering Mechanics, 2020, 37(11): 127-134. DOI: 10.6052/j.issn.1000-4750.2019.12.0790

THE EFFECT OF SURROUNDING EMPTY HOLES ON THE BLASTING VELOCITY AND DAMAGED ZONES

  • The blasting parameters of the Beishan Exploration Tunnel were designed based on the smooth blasting method. The smooth blasting which was influenced by the empty holes was studied in detail. From the blasting theory and the stress intensification principle, the distance of the surrounding empty holes was calculated to be 30 cm. Blasting was conducted under surrounding holes with empty holes to verify the calculated value. According to the hole utilization and the half hole ratio after blasting, the empty hole setting was considered to be more suitable. Moreover, the blasting vibration monitoring and the excavation damaged zone (EDZ) detection were separately approved. From the blasting vibration monitoring, the maximum blasting velocity of the empty hole setting cycle (12 cm/s) was much lower than that of the usual cycle (20 cm/s). From the EDZ detection, the damaged area of the empty hole setting side (22 cm) was also lower than that of the other side (27 cm). The blasting method includes many blasting parameters that interact with each other. The above blasting parameters were obtained for the empty hole effect of the surrounding hole. The results and the theoretical knowledge could be applied to the blasting and excavation of the deep geo-engineering and the HLW geo-disposal.
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