基于HHT法的出矿巷道爆破振动衰减规律研究

Research on Blasting Vibration Attenuation Law of Ore-drawing Roadway Based on HHT Method

为研究深孔爆破对巷道围岩稳固性的影响,通过采场深孔爆破振动测试,完成对巷道底板处质点的振速极值,持续时间,主振频率的监测。用线性回归方法对现场实测数据进行分析,得到爆破振动波在该区域的衰减规律,同时,结合HHT原理对爆破振动波的频谱特征进行分析,发现爆破振动波的瞬时能量主要集中于20Hz以内,极易引起地下矿山临近建筑物共振,建议给予重视。

In order to study the influence of deep-hole blasting on roadway stability, by means of deep hole blasting vibration test, the vibration velocity extreme value, the duration and the main vibration frequency of the particle at the bottom of the roadway were monitored. Then, linear regression method was used to analyze the measured data. The attenuation law of blas- ting vibration wave in this area was obtained. At the same time, combined with the HHT principle, the spectrum characteris- tics of blasting vibration wave was analyzed. It found that the instantaneous energy of blasting vibration wave was mainly con- centrated within 20 Hz, which was extremely easy to cause the resonance of the building near underground mine. The problem should be given full attention.