Tunnel drilling seismic record of drilling jumbo reconstruction gain method and its engineering application

In view of the complex frequency components of the drilling source of the drilling jumbo, some false events will be introduced during the deconvolution and cross-correlation processing, which will lead to the reduction of the quality of the reconstructed seismic record. In this paper, the research on the reconstruction gain method of the drilling source seismic record of the drilling jumbo based on VMD-spectral whitening is carried out. Taking the single-arm borehole source signal of rock drilling jumbo as the research object, combining the variational mode decomposition (VMD) and Hilbert spectrum whitening technology. Then, targeted increase of simulated drilling source signals, which are synthesized by multiple sine waves with different amplitudes and frequencies. Next, the reconstruction of borehole source seismic record is realized by least square deconvolution and cross-correlation interference technology, which weakens the influence of false events and improves the signal-to noise ratio of borehole source reconstruction seismic record. The processing effect is analyzed by forward simulation, and the method is applied to practical engineering. The detection results are basically consistent with the actual excavation situation, which verifies the effectiveness and feasibility of the method.