基于HHT的远区爆破振动信号能量演化及分布规律

本文基于HHT分析法,对远区爆破振动信号进行时频分析,研究信号中能量随爆源距增加的演化及分布规律。结果表明：爆破振动总能量及峰值能量随着爆源距的增加衰减较快；低频段能量在传播过程中会随爆源距增加有增大的趋势,而中高频能量则是随着爆源距的增加有减小的趋势,同时,爆源距对远区爆破振动的频率段构成也会造成影响,即频率左右限均有减小的趋势,但频带宽度总体保持不变。考虑爆破振动信号所携带的能量信息在爆破振动设计方案的优化中同样具有重大的工程意义。

Based on HHT energy evolution and distribution of blasting vibration signals in far-zone

Based on HHT analytical method, time-frequency analysis of far-zone blasting vibration signals was made in the paper, in an effort to study the evolution and distribution laws of signal energy with the increase in blasting sources. It was found that: the total blasting vibration energy and peak energy declined relatively quickly with the growth in distance of blasting sources; the low-frequency energy tended to increase with the growth in distance of blasting sources during the transmitting process; the medium-high frequency energy tended to decline with the rise in distance of blasting sources; meanwhile, the distance of blasting sources also affected the frequency band of far-zone blasting vibration. In other words, both the left and right frequency limit tended to decline while the overall frequency bandwidth remained unchanged. It is believed that the energy information carried by blasting vibration signals will be also of great engineering significance to the optimization of blasting vibration design schemes.