基于EMD-HHT的地下浅孔爆破振动规律研究

为了研究金沙矿业官房矿段地下浅孔爆破作业过程中地震强度过大的问题,采取爆破振动监测手段在地表对两次不同炸药量的爆破作业进行监测。基于HHT方法和EMD分解对地下浅孔爆破地震波信号的峰值振速、频率和振幅进行了分析。结果表明:峰值振速反映爆破振动强度及最大荷载区域,主振频率反映爆破作业下建(构)筑物的动态响应情况。地下浅孔爆破振动信号的优势能量频带都在10～50Hz,在不同药量下爆破的主振频率一般不同,振动频率随药量的增加有向低频集中及瞬时输入能量增大的趋势。

Research on Vibration Law of Underground Shallow Hole Blasting Based on EMD-HHT

In order to study the problem of excessive earthquake intensity in the blasting operation of shallow hole underground in the Guanfang section of Jinsha mining, the blasting vibration monitoring method was adopted to monitor two blasting operations with different explosive quantities on the surface. Based on HHT method and EMD decomposition, the peak vibration velocity, frequency and amplitude of shallow hole blasting seismic signal were analyzed. The results showed that the peak vibration velocity reflected the blasting vibration intensity and the maximum load area, and the main vibration frequency reflected the dynamic response of the construction under blasting operation. The dominant energy frequency band of blasting vibration signals of underground shallow holes were all in the range of 10~50 Hz, and the main vibration frequency of blasting was generally different under different charges. The vibration frequency tended to concentrate towards low frequency and increase in instantaneous input energy with the increase of charges.