Experimental Study on Optimizing Reasonable Interhole Microdifference Time Based on Seismic Wave Interference Superposition
To solve the problem of excessive vibration caused by deep hole blasting in a certain underground mine affect-ing surface villages,the blasting vibration half cycle interference superposition method is adopted to reduce blasting vibration.Based on the principle of seismic wave interference superposition and shock absorption,single hole blasting vibration waveforms corresponding to different explosive charges were collected,and blasting vibration images were obtained for each hole.The blas-ting vibration half cycles of the five holes were determined to be 13.7,14.1,8.3,14.5,and 12.1 ms,respectively.Therefore,8,10,12,and 14 ms were taken as the inter hole micro difference time for subsequent experiments.Then,18 ms was selected as the intermediate value for comparing the original blasting design with the new blasting design to participate in subsequent inter hole micro difference blasting experiments,and 100 ms was used as the inter row micro difference time for blasting schemes.To evaluate the degree of blasting vibration attenuation,the collected blasting vibration signals from the original blasting design were subjected to Sadovski formula regression analysis,and the site coefficient k=222.09 and vibration attenuation coefficient α=1.47 related to blasting conditions,rock characteristics,etc.were obtained.The experimental results showed that when using a 12 ms inter hole micro difference interval time for detonation,there were no vibration increase points in the blasting vibra-tion,with an average damping rate of 30.8%and a maximum damping rate of 74.19%.In the 14 ms inter hole micro difference time blasting data with concentrated vibration half cycles,although the average damping rate of the effective damping points reached 50.31%,there were 44.44%vibration increase points.Through comparison,it was found that the damping effect of 12 ms was the best.The method of shock absorption based on changing the micro difference time to superimpose vibration wave in-terference has a simple principle and strong practicality,and has certain advantages for promotion in engineering construction.
万方数据
维普
