Analysis Of Intensity Of Physical Quantities Of Open-pit Blasting Vibration And Research Of Time-frequency Characteristics Of It

Daily open-pit blasting blasting vibration is caused by the inevitable result of production operations, with the extensive use of blasting and blasting technology, continuous expansion of the scale of blasting vibration control of hazards put forward higher requirements. Therefore, a reasonable prediction blasting vibration attenuation law is to be effectively controlled blasting vibration against the foundation and prerequisite. Papers based on open-pit mine blast in Heilongjiang Yongping production monitoring the vibration measured data obtained using theoretical analysis and experimental study of a combination of methods, Physical quantities on the intensity of blasting vibration waveform, the peak velocity characteristics of the study; using regression analysis of the velocity peak and the main vibration frequency of the forecasts; In introducing the Fourier analysis and wavelet analysis theory, based on the measured data signals were Fourier spectrum analysis and wavelet time-frequency analysis.The measured velocity waveforms by numerical calculus terms, to be acceleration, displacement waveform, comparative analysis of these three kinds of intensity of physical quantity changes in the waveform and frequency spectrum characteristics, and obtained by regression analysis between the empirical formula of the three peaks; using interval estimation method, the peak vibration velocity prediction and control were studied. At the same time creatively put forward the blast site geological conditions to adapt to take into account the impact of Sadowsky elevation correction formula and the frequency prediction equation. In practice, you can get the conclusions and formulas based on the intensity and frequency of blasting vibration comprehensive analysis and pre-judgment.Contains interference and noise for the measured signal, the application of wavelet analysis theory, the threshold de-noising method and to carry out a wavelet decomposition and reconstruction, the reconstructed blast vibration signals significantly weaken the interference components to gain a more realistic blasting vibration signal in order to facilitate their further analysis. Using wavelet analysis method, de-noising the measured signal after the wavelet decomposition of multi-access to the PPV and blasting vibration frequency components of wavelet band energy, through the analysis and comparison, obtained wavelet band energy can be reflected blasting vibration of the "three elements", that is, vibration intensity, frequency and duration. Comparison with Fourier analysis,Wavelet analysis can be seen in analyzing the advantages of blasting vibration signals can be more systematic and comprehensive analysis of them.