Damping Blasting Experiment Research With Digital Detonator At The Area Close To Tunnel

Blasting technology is widely used in the mine production, tunnel excavation andurban blasting engineering. The harm to the surrounding structures of blastingvibration effects has always been the focus of the blasting safety protection. Blastingvibration technology develops with the development of blasting equipment. The birthof digital detonator improved the accuracy of millisecond blasting.It’s based on the technology research project of control blasting adjacentDongchuan river diversion tunnel area. Previous studies on the digital milliseconddeferred blasting detonators focused on determining a reasonable time fromtheoretical analysis and fewer blasting holes millisecond test, but the research on thereasonable time of large millisecond blasting is less. The scene blasting reasonabletime and numerical simulation test are adopted to study the reasonable time ofmulti-row millisecond deferred blasting and compare the damping effect of digitaldetonator with tube detonator. Hilbert-Huang transform is used to analyze thevibration signal and the difference in the distribution of blasting vibration frequencybetween digital detonators and tube detonator blasting. The mainly achievement is asfollowing:In jinduicheng mine using the detonating tube detonator production blasting,and take blasting vibration monitoring for the propagation rules of blasting vibrationof Jinduicheng Open-pit Mine. The result shows that when the delay time is30ms/75ms, the blasting effect is optimal. Compare with detonating tube detonator,The damping rate is38.4%.Take rock fragmentation analysis after blasting, the average fragmentation ofConventional blasting is28.3cm, the average fragmentation of digital differentialblasting is18.13cm. That means the average fragmentation be diminished.Use HHT method to analysis blasting vibration data, Compared with thedetonating tube detonator,the energy distribution of digital detonator has higherfrequency. Detonating tube are mainly distributed in10Hz to100Hz, However, Digital detonator are mainly distributed in the range which greater than100Hz.