Research Of Harmfulness On Blasting Vibration In Open Coal Mine

Along with the wide application of blasting method, blastingvibration disaster, caused by blasting, start to destroy our life, especiallythe buildings surround the blasting areas have been serious destroyed.Domestic and foreign scholars in different areas never interrupted theresearch work of blasting vibration effect. But because of blasting seismicwave is a typical nonstationary random signal, itself mutations quickly,short duration, makes it is hard to speed up the research, there are manyproblems needed to be solved and perfect. To the above problems, thispaper puts forward a research subject to effectively control the blastingseismic effect. The are based on a large number of blasting vibrationinfluence factors of analysis, by using wavelet and wavelet packetanalysis method and time-energy density analysis, to explore the impactof these factors and effective way of means of control. In this paper, themain research results are as follows:(1) Blasting vibration monitoring was brought into a mine,regressing forecasting peak speed of blasting vibration by using the leastsquare method, and calculates safe distance of the corresponding amountof explosives, reduce the demolition vibration disasters on the influence of the houses around.(2) Wavelet packet analysis method and wavelet packet analysismethod were used to dispose blasting waves, such as decomposition,denoising and reconstruction, filter out the noise, more accuratelyreflect the characteristics of blasting seismic waves. The method of FFTwas used to get the time-frequency properties of blasting vibrationmonitoring. The frequency picture was drown to represent thecharacteristics of blasting seismic wave frequency domain.(3) Wavelet packet analysis method and wavelet packet analysismethod were used to dispose the frequency domain of blasting waves,then use time-energy density analysis method to analysis the energystatistics data and get the figure of frequency-amplitude which canrepresent the different frequency band of the energy distribution clearly.(4) There are two different waves, which have the same variable ofbiggest single drug ring and explosion source distance, total explosivewas same. time-energy density analysis method was used to get thedistribution of energy, and analysis the influence made by different totalexplosive. Use the same analysis method, the influence made by biggestsingle drug ring and explosion source distance also can be gotten.