摘要
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,利用小波包技术对比分析了单段和多段微差爆破、单段有无临空面等不同爆破条件下监测到的爆破振动信号各频带上的能量分布特性,研究结果表明:爆破振动信号能量集中分布在200 Hz以下的主振频带附近,主振频带又可分为几个子振带;爆破振动信号中高频(90～125 Hz)成分的衰减快于低频(0～75 Hz)成分;单段爆破条件下振动信号在低频带上的能量分布要高于多段微差爆破时振动信号在该频带上的能量分布;当炮孔有临空面时,炸药爆炸后穿过岩石粉碎区并以地震波形式传播的能量会减小;单段爆破时,药量的增加会导致振动信号总能量的明显增加,但对于各频带能量分布规律的影响并不明显。
To study blasting seismic signal from the features of energy distribution point and to control the blasting vibration hazard ,the wavelet packet technology was used to comparatively analyze the energy distribution at different frequency band considering millisecond delay and free face effect. Results show that the energy of blasting seismic signal mostly concentrates on the dominant frequency band （below 200 Hz） which was divided into several subbands. The attenuation of high frequency （90 - 125 Hz） components was more rapid than low frequency （0 - 75 Hz） components in blasting seismic signal. Compared to multi-millisecond blasting,the energy of single blasting vibration signal focuses much more on low frequency band. The seismic wave from explosive energy across the rock crushing zone decreased due to the free face effect. In the case of single blasting, the total energy of blasting vibration signal increased obviously with charge amount, while the energy distribution change little.
出处
《爆破》
CSCD
北大核心
2012年第4期1-5,79,共6页
Blasting
基金
国家自然科学基金重点项目(51134012)
国家自然科学基金面上项目(51174183)
关键词
爆破振动
能量分布
频带
单段爆破
多段微差爆破
blasting vibration
energy distribution
frequency band
single deck blasting
multi-millisecond blasting
