基于CEEMD-HHT方法确定隧洞爆破网路实际延迟时间

摘要

为解决爆破网路设计延迟时间和实际延迟时间存在较大误差的问题,利用互补集合经验模态分解(Complementary Ensemble Empirical Mode Decomposition,CEEMD)对爆破振动信号分解求出IMF分量,对各IMF分量进行Hilbert变换求出各分量的能量,选取能量最大的分量进行Hilbert变换求出该分量的包络线.各段雷管的起爆时刻即该包络线峰值点对应的时间,通过峰值点的时间间隔可以确定微差爆破的实际延期时间.以黄河上游某水电站引水发电隧洞实测爆破振动信号为例进行分析,同一次爆破,两个不同测点的信号按CEEMD-HHT方法确定的各段别雷管的实际延迟时间,具有很好的一致性,验证了此方法的有效性.%There is a big error between the designed delay time and real one.To solve the problem,the method with Complementary Ensemble Empirical Mode Decomposition is proposed to decompose a blasting vibration signal into IMF components.Energies of IMF components are calculated through Hilbert transform and the envelope curve is drawn from maximum energy component.The envelope curve peaks can identify the blasting moment of short-delay detonators in millisecond blasting engineering.Then,the real delay time can be ascertained.The blasting vibration signals are analyzed on a hydropower station's diversion tunnel project of the Yellow River's upstream.The real detonator delay time of two signals in different places with a same blasting fit well,which shows the feasibility of the proposed CEEMD-HHT method.