以重庆渝中连接隧道爆破工程为例，利用Hilbert-Huang变换分析爆破振速信号，对比瞬时能量法与EMD识别法识别雷管实际延时时间效果。研究结果显示，瞬时能量法识别率在30%~60%，低段别平均识别率仅35%；而EMD识别法识别率为60%~90%，各段别识别率均较瞬时能量法高约25%。对不同药量单孔爆破实验分析表明，单孔药量1.2 kg的起爆能量衰减时间为150 ms。常规药量下雷管间微差起爆间隔大于50 ms以上时可用瞬时能量法识别起爆时刻；城市隧道用50 ms以下小间隔微差爆破时用EMD识别法识别率较高。

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.