The Research Of Open-pit Mine Blasting Vibration Signal Analysis And Slope Stability Numerical Simulation

Open-pit mine blasting vibration harm and slope stability has always been the key technology of open-pit mine production safety, and has been a basic research of mining engineering and rock mechanics and other related disciplines. How to guarantee the mine safety and efficient production under the premise of reasonable reduce blasting vibration effect, control blasting vibration damage, has been a major task faced by blasting areas of scientific research technical personnel at home and abroad.At present, for open-pit mine the prevention and control of blasting vibration effect, still is the blasting vibration monitoring and numerical simulation method. Collected from a host of practical engineering, the monitoring results, the blasting vibration signal has a short duration, quick mutations and a fast attenuation characteristics, belongs to the typical non-stationary random process. As the blasting vibration signal analysis technology and the continuous development of analytical instruments, as well as the further understanding of blasting vibration signals of blasting engineering and technical personnel, including Fourier transform, wavelet and wavelet packet transform, HHT transform, blasting analysis method of response spectrum analysis and so on. More mature application in the field of signal FFT (fast Fourier transform) and STFT (short time Fourier transform) analysis, the dominant frequency of blasting vibration signal recognition, has irreplaceable advantages, but for non-stationary signal processing, has highlighted the many disadvantages, such as the frequency domain and time domain characteristics of the signal can not be combined very well. Another important analysis method is wavelet and wavelet packet transform and analysis, it makes up for the Fourier analysis of the defect, the results of its analysis not only be able to give a non-stationary signals in time domain characteristics, and be able to more clearly get the frequency domain characteristics of the signal, and has a good prospect in the actual analysis. The followed HHT (Hilbert transform) analysis method is a kind of new analysis method, through the study of the HHT transform of signal, can be revealed from the Angle of time-frequency-energy characteristics of blasting vibration signal contains information, improve the blasting analysis means of diversification. Response spectrum analysis method is a kind of dynamic response analysis, parsing by interpolation method, could get blasting vibration intensity trend along with the change of frequency and cycle. Along with the progress of the development of computer science and software research and development, numerical simulation has become the one of the most effective means of study and predict the blasting vibration effect, slope, etc. related to complex constitutive equation model, provides a greatpossible.Powerful superiority to finite element analysis method is bound to be under the blasting vibration dynamic response and stability of the slope body research, get more extensive application.Combined with a variety of analysis methods, this study focuses on vibration signal analysis of Ling Shi open-pit mine engineering, to use the advanced software SLOPE/W, the slope stability status are simulated. Through the analysis and get the following conclusion:(1). from the aspects of frequency, as the pitch increased the blasting vibration main frequency has a tendency to develop toward low frequency. But in the three direction components of vibration signal, the slope height selection amplification effects are not identical.(2). from the aspects of blasting execution, through the wavelet analysis method, obtained the differential detonator accurate delay time intervals, and use the wavelet packet analysis, obtained the energy attenuation law in different frequency of blasting vibration signals.(3).from the blasting security, through the HHT analysis method, verifies the fact that early burst phenomenon. Through the adoption of different spectral analysis, get the energy distribution along with frequency and other parameters at any time.(4).from the protection of buildings, using the response spectrum analysis method, obtained that with the increase of damping ratio coefficient, the structural response amplitude is reduced. And with response spectrum of the height amplifier effect is not only reflected on the amplitude, but also reflected in the advantages of frequency band extension.(5). from the aspects of slope stability, through the numerical simulation research, obtained the slope stress and strain state of different parts of the body, and evaluate the slope safety status and relasted influencing factors of slope stability.In this paper, take mine blasting engineering in Ling shi open-pit as the blackground, it conduct multiple angles and multidimensional analysis for the blasting vibration signals collected on site, reveals the characteristics of information is contained in blasting vibration signal. Based on the analysis of blasting vibration signal, summarizes the different terrain conditions, propagation law of blasting vibration signal and the attenuation characteristics, so as to provide theoretical basis for the optimization of blasting parameters, the reasonable design of blasting network and the premise of guaranteeing safe production of mine, to achieve maximum benefit of mine. Then the blasting vibration excitation, slope stability was studied emphatically, to reproduce the objective dynamic slope stability response trend of process and safety coefficient with time. For the building of open-pit mine blasting safety guarantee system, it offers some guidance and theoretical reference.