Research on testing and controlling techniques of millisecond delay blasting vibration in coal mine rock roadway
In order to improve the blasting effect and reduce the blasting vibration in hard rock roadwaythe millisecond delay blasting parameters were optimized and implementedand the velocity of blasting vibration was measured.The correlation between blasting parameters and characteristics of
blasting vibration signal was analyzed.For delay errors of electric detonatorsthe method of time-energy density analysis based on wavelet transform was adopted to identify the real delay time in millisecond blastingand technical measures for reducing the blasting effect were put forward.The
results show that a good blasting effect could be obtained by using reasonable millisecond delay blasting parametersand the vertical peak particle velocity of blasting vibration can be taken as safety criterion for rock roadway.The method of time-energy density analysis can identify the blasting
moment of detonators and ascertain the real delay time effectively.
Keywords: delay time; method of time-energy density analysis; millisecond delay blasting; vibration effect; vibration monitoring
Document Type: Research Article
Publication date: 15 March 2013
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