Blasting vibration measurement and analyses of millisecond blasting model test for shaft
With two-circle blast holes in vertical shaft blasting as the prototype, three kinds of parallel millisecond blasting model tests with two-circle vertical blast holes were conducted to investigate the way to reducing the blasting vibration effect in vertical shaft blasting construction. The blasting vibration on the concrete model was monitored by blasting vibration intelligent monitor UBOX-5016. The actual blasting vibration indicated that blasting vibration effect was reduced significantly by millisecond blasting by reducing maximum charge per delay. When detonation delay was 25ms, two blasting vibration waves, segment I and segment Ⅱ overlaid each other and the actual peak blasting vibration velocity is smaller by interference effect of vibration reduction. When detonation delay was 50ms, two blasting vibration waves, segment I and segment Ⅲ were almost independent and the actual peak blasting vibration velocity was determined by maximum charge per delay. Spectrum analyses were implemented for vertical blasting vibration of three millisecond blasting model tests. The amplitude spectrum of millisecond blasting was much lower than simultaneous blasting and spectrum waveform of millisecond blasting was also more complex. The blasting vibration effect could be reduced remarkable by millisecond blasting which presented a higher blasting vibration frequency.
Research Center of Mine Underground Engineering, Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China
Abstract:With two-circle blast holes in vertical shaft blasting as the prototype, three kinds of parallel millisecond blasting model tests with two-circle vertical blast holes were conducted to investigate the way to reducing the blasting vibration effect in vertical shaft blasting construction. The blasting vibration on the concrete model was monitored by blasting vibration intelligent monitor UBOX-5016. The actual blasting vibration indicated that blasting vibration effect was reduced significantly by millisecond blasting by reducing maximum charge per delay. When detonation delay was 25ms, two blasting vibration waves, segment I and segment Ⅱ overlaid each other and the actual peak blasting vibration velocity is smaller by interference effect of vibration reduction. When detonation delay was 50ms, two blasting vibration waves, segment I and segment Ⅲ were almost independent and the actual peak blasting vibration velocity was determined by maximum charge per delay. Spectrum analyses were implemented for vertical blasting vibration of three millisecond blasting model tests. The amplitude spectrum of millisecond blasting was much lower than simultaneous blasting and spectrum waveform of millisecond blasting was also more complex. The blasting vibration effect could be reduced remarkable by millisecond blasting which presented a higher blasting vibration frequency.
马芹永,袁 璞,张经双,韩 博. 立井直眼微差爆破模型试验振动测试与分析[J]. 振动与冲击, 2015, 34(6): 172-176.
MA Qin-yong,YUAN Pu,ZHANG Jing-shuang,HAN Bo. Blasting vibration measurement and analyses of millisecond blasting model test for shaft. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(6): 172-176.
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