In order to explore the vibration characteristics of deep hole blasting in near and far field,based on field test,this paper used the regression analysis,random analysis and wavelet packet decomposition to carry on a comparative study from the attenuation,three-component characteristic,random characteristic and energy distribution of blasting vibration signals.The results show that the values of K and α of the three-component of vibration velocity in the near field are both greater than those in the far field.The value of α of each component in the far field is closer to each other.The correlation coefficient of the three-component vibration velocity in the far field is greater than that in the near field,and closer to 1.The vertical component in the three components is the largest.In the near field,when the scaled distance is less than 5,the radial velocity is the largest,otherwise,the vertical velocity is the largest.In the far field,the vertical velocity is always the largest.Both in the near and far field,the tangential velocity is generally minimal.The coefficient of variation of the three components of vibration velocity in the near field is larger than that in the far field,and the coefficient of variation of the radial velocity are close in the near and far field.When the maximum charge weight per delayed interval or distance is increased,energy in the near and far field gradually move toward the low frequency band,in which it moved faster in near field.At the same time,the frequency band width of energy distribution in the near and far field also tend to focus,and the frequency band width in near field is larger.
Key words
deep hole blasting /
near field /
regression analysis /
attenuation law /
random variables /
energy distribution /
wavelet packet
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