微差爆破试验及爆破振动能量的小波包分析

为从能量分布角度研究爆破振动信号以控制爆破地震危害,结合室内混凝土边坡相似微差爆破模拟试验,利用MATLAB 7.0,结合小波包技术,研究了振动信号能量和峰值速度随距离的变化规律,分析了减震沟对振动信号能量与峰值速度的削弱程度,以及对振动信号能量分布的影响。总结得出:减震沟使得爆破振动信号能量卓越频带向低频带集中;一定范围内,随传播距离的增加,爆破振动信号峰值振动速度与总能量衰减趋势逐渐变缓;峰值振动速度大的爆破振动信号携带能量不一定大,能量不仅仅是振动速度的表征。

Millisecond Blasting Tests and Wavelet Packet Analysis of Blasting Vibration Energy

To study blasting vibration signal from the features of energy distribution to control the blasting vibration hazard，and combined with the experiment of millisecond blasting simulation by indoor concrete slope，the variation law of the vibration signals energy and the peak velocity with the distance is studied with MATLAB 7.0 and the wavelet pocket technique.The weakening degree of vibration signals energy and peak velocity by damping ditch，and as well as its effect on the distribution of the energy are analyzed.The conclusion is that damping ditch makes the predominant frequency of blasting vibration signal energy concentrate on the low frequency band.Within certain limits，the decrease trend of peak vibration speed and total energy of blasting vibration signals gradually becomes weaker with the increase of the propagation distance.The blasting vibration signals with large peak vibration velocity may not necessarily carry large energy，and the energy is not just the character of vibration velocity.