Characterization of Blasting Vibration in Open Slopes
To address the blasting vibration response of the open slope in Hongshan mountain,ombined with a binary regression blasting vibration velocity attenuation model with elevation H is introduced,an analysis of the measured peak blast vibration velocity(PPV)and the prediction of the blasting vibration velocity attenuation law were carried out,and the blasting vibration characteristics of the open slope was analyzed.The results show that the more the number of free-faces,the smaller the PPV.The PPV of single-free surface is much larger than that of double and triple free surfaces.When the elevation difference|H|is the same,the PPV of positive elevation is larger than that of negative elevation.There is obvious elevation amplification effect of blasting vibration in the open slope,and the amplification coefficient increases first and then decreases with the increase of|H|,and decreases with the increase of horizontal detonation center distances.In terms of vibration velocity attenuation law,|H|has a greater impact on the tangential direction of the velocity,the elevation effect is obvious.The more the number of free-surface,the smoother the blasting vibration velocity attenuation surface.The introduction of the elevation of H binary regression blasting velocity attenuation model is more effective than the traditional Sadowski formula regression model in predicting blasting vibration velocity attenuation law.The relative average errors are 12.3%～15.4%,of which the relative average error of the combined velocities of single-free surface is only 9.5%.
open slopevibration characteristicselevation effectfree surfaceattenuation lawSadowski formula
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