岩巷爆破振动信号的HHT分析与应用

为优化爆破参数,减少对围岩的损伤,以煤矿玄武岩双巷道楔形深孔掏槽爆破的实测爆破振动信号为例,分析对比传统傅里叶变换、小波变换、HHT变换三种变换方法,对爆破地震波信号的时频特性和能量分布特征分析。结果表明:HHT变换能够确保信号被分解后的非平稳性,且自动适应能力较强,分解效率较高。通过HHT变换得到三维图直观展示各分量随时间、频率和能量的分布情况。爆破振动能量主要分布在0.3s¹.0s时间段和01.0s时间段和0⁴00Hz频率段内,频带100Hz400Hz频率段内,频带100Hz²50Hz中爆破振动分量对应的频带能量达到最大。通过分析对比爆破振动信号,得到巷道帮部、底部爆破振动信号的主振方向分别为Y(切向)和Z(垂向)方向。

HHT Analysis and application of blasting vibration in rock roadway excavation

To optimize the blasting parameters and reduce the damage of the surrounding rock,the measured blasting vibration signal of the deep hole cutting blasting in the wedge of the double channel of coal mine was taken as an example.FFT,WT and HHT were compared and time-frequency characteristics and energy distribution of blasting seismic wave signal was analyzed.The analysis showed HHT method could ensure the signal non-stationary after being decomposed.The adaptive ability was the strongest of three and the decomposition efficiency was the highest.The distribution of IMF componented with time,frequency and energy were obtained by HHT method.The results showed that the energy of blasting vibration was mainly distributed in 0.3s250Hz中爆破振动分量对应的频带能量达到最大。通过分析对比爆破振动信号,得到巷道帮部、底部爆破振动信号的主振方向分别为Y(切向)和Z(垂向)方向。To optimize the blasting parameters and reduce the damage of the surrounding rock,the measured blasting vibration signal of the deep hole cutting blasting in the wedge of the double channel of coal mine was taken as an example.FFT,WT and HHT were compared and time-frequency characteristics and energy distribution of blasting seismic wave signal was analyzed.The analysis showed HHT method could ensure the signal non-stationary after being decomposed.The adaptive ability was the strongest of three and the decomposition efficiency was the highest.The distribution of IMF componented with time,frequency and energy were obtained by HHT method.The results showed that the energy of blasting vibration was mainly distributed in 0.3s¹.0sand 01.0sand 0⁴00Hz,and band energy corresponding to the blasting vibration componented in 100Hz400Hz,and band energy corresponding to the blasting vibration componented in 100Hz²50Hz.Through the analysis of the blasting vibration signal,the main vibration direction of the tunnel section and the bottom blasting vibration signal were Z(vertical)direction and Y(tangential)direction were obtained.