Study On Vibration Signal Analysis And Disaster Control Technology For Large-scale Blasting In Deep Stope

As the shallow resources were exhausted, deep resources becomes the main exploited body of many mines. Based on the background of large-scale blasting of deep V# ore body in the Xin Chen gold mine, this thesis study on disaster control technology induced by large-scale mid-deep hole blasting in deep stope. The main reseach contents and conclusion are as follows:(1) Both short duration and quick change are the characteristics of blasting vibration signals. The wavelet packet analysis can select relevant frequency band for matching signal frequency spectrum according to the feature of signals. By analysis of wavelet packet theory, the law of energy distribution of different frequency band was provided, and the influence on the energy distribution characteristics of the blasting vibration signals of different explosion parameters was analyzed. Based on dynamics response of structure resulting from blasting vibration, and it applied as the equivalent energy for the harm evaluation standard of blasting vibration.(2) The blasting load will make the vibration signals jump at the very time when it takes place. Based on this, a new method to identify the misfire is put forward which used the abrupt change of signal energy prominently. The research shows analysis is more suitable for identifying the practical time of delay in millisecond Blasting than Wavelet Transform Modulus Maxima Method by contrasting with an instance. Then, based on the time-energy density, a new method to identify the misfire is put forward.(3) Based on the law of energy distribution of different frequency band, the maximum charges of blasted delay and the best millisecond time in blasting parameters was discussed to control positively the disaster of large-scale blasting.(4) The change of stress, displacement and plastic deformation of surrounding rock under blasting dynamic load was calculated by FLAC 3D. The better support type of rock was selected by analysis of the displacement change of surrounding rock under blasting dynamic load with different strut type, and applied to maintain stability of the stope roof.