Study on cross terms suppression of tunnel blasting vibration signals and time of detonator delay

doi:10.16265/j.cnki.issn 1003-3033.2021.12.008

Abstract

Abstract: In order to solve the difficulty in eliminating cross terms in time-frequency domain of tunnel blasting vibration signals as they tend to be influenced by test environment, MP-SPWVD combination algorithm was adopted to effectively suppress cross terms in time-frequency spectrum of micro-delay blasting vibration signals. At the same time, time-energy density method was adopted to accurately determine actual delay time of each section of detonators in tunnel initiation networks. The results show that MP-SPWVD algorithm can effectively reduce adverse effects of cross terms on signal energy amplitude and local region characteristics. Actual delay time between detonator segments can be adaptively judged by time-energy density distribution of MP reconstructed signal, which has a good application prospect. Moreover, delay discrimination accuracy of detonators is closely related to delay time.

Key words: tunnel blasting, blasting vibration signal, cross terms, delay time, matching pursuit-smoothed pseudo Wigner Ville distribution (MP-SPWVD), wavelet time-energy density method

CLC Number:

X932

FU Xiaoqiang, YU Jin. Study on cross terms suppression of tunnel blasting vibration signals and time of detonator delay[J]. China Safety Science Journal, 2021, 31(12): 53-61.

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