隧道爆破信号交叉项抑制及雷管延期时间研究

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

为解决隧道爆破振动信号易受测试环境影响而导致其时频域交叉项难以消除的难题,采用匹配追踪-平滑伪魏格纳分布(MP-SPWVD)组合算法,有效抑制微差爆破振动信号时频谱中的交叉项;同时采用小波时-能密度法精确判别隧道起爆网路中各段别雷管实际延期时间。研究表明:MP-SPWVD算法可有效削弱时频谱中交叉项对信号能量幅值和局部区域特征的不利影响;MP重构信号小波时-能密度分布可自适应地判别雷管段间实际延期时间,具有良好的应用前景;雷管延期判别精度与其延期时间密切相关。

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.