Application of identification method for the detonator&rsquo;s real delay time based on HHT to millisecond blasting in urban environment

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (10) : 206-212.

Application of identification method for the detonator’s real delay time based on HHT to millisecond blasting in urban environment

GONG Min1，QIU Yi-keke1，MENG Xiang-dong2，LI Yong-qiang3

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Abstract

The exact identification of detonator actual delay time is the foundation to analyze the relationship between millisecond interval and blasting vibration velocity and it is of great significance to control blasting vibration for tunnel excavation in complex urban environment. Taking the Chongqing Yuzhong connecting tunnel blasting engineering for example, data of the blasting vibration velocity-time are analyzed by HHT(Hilbert-Huang Transform). The instantaneous energy method and the EMD method are compared on reliability identifying actual delay interval of detonators. The study results show that the instantaneous energy method identification rate is 30%-60%, detonators of lower segment have only average 35%; on contrary the EMD method identification rate is 60%-90%, identification rate of the total segments is also higher than the instantaneous energy method about 25%. The analysis which single-hole blasting experiment according to different blasting charges indication that attenuation time of the single-hole blasting energy is nearly 150ms when blasting charge is 1.2kg. Instantaneous energy method can be used to identify the initiation time on the condition of a usual blasting charge, if delay interval of detonators is longer than 50ms. However, the identification reliability of the EMD method will be relatively higher as it is used in the circumstance that short delay (50ms or less) blasting is conducted in urban tunnel excavation.

Key words

/ HHT；urban tunnel；millisecond blasting；delay time；identification

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GONG Min1，QIU Yi-keke1，MENG Xiang-dong2，LI Yong-qiang3. Application of identification method for the detonator’s real delay time based on HHT to millisecond blasting in urban environment[J]. Journal of Vibration and Shock, 2015, 34(10): 206-212

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