基于EEMD-HHT方法的隧洞爆破网路延时分析

Delay time analysis of tunnel blasting network based on EEMD-HHT method

由于非电毫秒雷管本身存在起爆误差,造成网路理论延时与实际延时存在较大误差。为更深入研究网路实际延时时间,以黄河上游某水电站引水发电隧洞工程实测爆破振动信号为分析对象,使用EEMD方法求出爆破信号IMF分量,进行Hilbert变换求出各分量能量,并对能量最大分量进行Hilbert变换求出包络线,再对包络线峰值进行分析得到网路的各段非电雷管的实际起爆时刻分别为49,74,178,235,350,469,609ms,从而准确求得网路中各段间的实际延时时间为25,104,57,115,119,140ms。对网路的理论与实际延时时间进行对比分析,发现理论与实际延时时间存在较大精度误差,这说明采用EEMD-HHT方法识别网路的延时精度是可行的。

Because of the initiation errors of non-electric millisecond detonator, there was a greater error of the theoretical and the realistic delay time. In order to research realistic delay time of the network in depth, based on the blasting vibration signals of a hydropower station diversion tunnel project in the upstream of the Yellow River, EEMD method was used to obtain the IMF components of blasting vibration signals, the energy of IMF components were calculated with Hilbert transform, and envelope curve was got from maximum energy component with Hilbert transform. The actual initiation time of each section of non-electric detonator were 49, 74, 178, 235, 350, 469, 609 ms through analyzing envelope peak respectively. It could be calculated accurately that realistic delay time between each section of the blasting network were 25, 104,57,115,119,140 ms respectively. The theoretical and the realistic delay time were comparatively analyzed. It showed that EEMD-HHT method was feasible to identify the delay precision of blasting network.