Analysis of the Main Factors Influencing the Dominant Frequency of Blast Vibration

Da Liu,Ming Chen,Yijia Liu,Peng Yan,Wenbo Lu,Pengchang Sun

doi:10.1155/2019/8480905

Abstract

At present, the study on the dominant frequency of blasting vibration is still a worldwide problem. Compared with the mature research on the particle peak velocity of blasting vibration, the researches on the dominant frequency of blasting vibration are much less. In this paper, by analyzing the main influencing factors of the dominant frequency, an attenuation equation of the dominant frequency induced by blasting vibration has been proposed by dimensional analysis combined with the theory of radial spherical wave propagation. The proposed equation is applied to the fitting analysis on the dominant frequency measured in Zhoushan Green Petrochemical Base in China, which has obtained a favorable fitting correlation. Based on the fitting analysis, it has found that the correlation coefficient of radial vibration obtained by the proposed equation is higher than that of vertical vibration, which is resulted from the reason that the vibration in vertical is considered to be influenced most by the R-wave on the ground and perceived to be quite different from the radial vibration affected by P-wave. In generally, different components of blasting waves will affect the attenuation of dominant frequency.

Highlights

Blasting excavation has been widely used in mining, water and hydropower engineering, highway, municipal infrastructure construction, and other fields [1]
The fitting correlation coefficient of dominant frequency in X-direction is generally higher than that of the other two directions, and the vertical direction obtains the worst relevance, which is in compliance with previous discussion that the radial vibration is normally perceived to be related to the P-wave, while the vibration in vertical is normally considered to be influenced most by the R-wave reflected by the free face on the ground [2]
Based on the theoretical derivation of the attenuation equation of the dominant frequency induced by blasting and the fitting analysis of the dominant frequency in Zhoushan Green Petrochemical Base, the following conclusions can be drawn: (1) An equation reflecting the change of dominant frequency induced by blasting has been derived by dimensional analysis combined with the theory of radial spherical wave propagation

Summary

Introduction

Blasting excavation has been widely used in mining, water and hydropower engineering, highway, municipal infrastructure construction, and other fields [1]. With the progress of the analysis technique of blasting vibration spectrum, many prediction formulas have been proposed by using the method of artificial neural network [13], support vector machine [14], and gene expression programming [15]. These formulas can obtain favorable fitting correlation, they are difficult to apply in engineer practice because of its too complex fitting parameters and calculation. These formulas can obtain favorable fitting correlation, they are difficult to apply in engineer practice because of its too complex fitting parameters and calculation. erefore, it is necessary to obtain a simple and practicable formula, which can reflect the changes of the dominant frequency with distance

The Attenuation Equation of Dominant Frequency Induced by Blasting

Comparison with Other Formulas

Conclusion