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Analysis of Waveform Superimposed Action of Millisecond Blasting

GUO Xue-bin~1,ZHANG Ji-chun~2,LIU Quan~3,PU Chuan-jin~1(1.College of Environmental Engineering,Southwest University of Science and Technology,Mianyang 621002,China;2.School of Civil Engineering,Southwest Jiaotong University,Chengdu610031,China;3.Internal River Design Institute of Sichuan,Chengdu 610031,China)  
Based on analyzing the difference of propagation speeds among P-waves,S-waves and surface waves,the vibration of single-hole blasting in homogeneous medium was measured.The separated properties of P-waves,S-waves and surface waves because of the increase of the propagation distance which their initial arriving moments are different from one another on the time history curves of blasting seismic waves were studied.Through the experiments of the vibration effect of deep-hole bench blasting with millisecond delay,the stacking properties among the delay intervals of millisecond blasting were analyzed.The results show that seismic waves adjacent to the delay intervals in millisecond blasting are close to each other and stack with the increase of propagation distance,thereby,the viewpoint that the distance factor should be take into account to determine the reasonable interval time of millisecond blasting was put forward.
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