CAJ | 학술논문

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66％～90％，各段识别率平均较瞬时能量法高约30％。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。
이중경투중련접수도폭파공정위례，이용 Hilbert-Huang 변환분석폭파진속신호，대비순시능량법여 EMD식별법식별뢰관실제연시시간효과。연구결과현시，순시능량법식별솔재30％～60％，저단별평균식별솔부35％；이EMD 식별법식별솔위66％～90％，각단식별솔평균교순시능량법고약30％。대불동약량단공폭파실험분석표명，단공약량1．2 kg 적기폭능량쇠감시간위150 ms。상규약량하뢰관간미차기폭간격대우50 ms 이상시가용순시능량법식별기폭시각；성시수도용50 ms 이하소간격미차폭파시용 EMD 식별법식별솔교고。
The exact identification of a detonator's actual firing time is a basis to analyze the relationship between millisecond interval and blasting vibration velocity,it is of great significance to control blasting vibration for tunnel excavation under complex urban environment. Here, taking Chongqing city Yuzhong connecting tunnel blasting engineering as an example,the blasting vibration velocity versus time data were analyzed with HHT (Hilbert-Huang transformation).The denotators'actural time-delay effects using the instantaneous energy method were compared with those using the EMD method.The study results showed that the instantaneous energy method identification rate is 30%~60%,the average identification rate detonators of lower segment is only 35%;while the EMD method identification rate is 66%~90%,the identification rates of all segments about 30% higher than those of the instantaneous energy method.The analysis for single-hole blasting tests with different blasting charges indicated that the attenuation time of a single-hole blasting's energy is nearly 150 ms with 112 kg blasting charge;the instantaneous energy method can be used to identify the initial blasting instant under the condition of a usual blasting charge if time delay of detonators is longer than 50 ms;however,the identification reliability of the EMD method is relatively higher if the time delay of fetonators in millisecond blasting is less than 50 ms for urban tunnel excavation.