Study on Wave Field Characteristics and Imaging of Collapse Column in Three-Dimensional Detection with Love Channel Wave Reflected outside the Working Face
The safety accidents caused by collapse column water diversion occur
frequently, which has great hidden danger to the safety production of coal
mine. Limited by the space of underground, the detection of collapse column on
the outside of working face has been a difficult problem. Based on this,
numerical simulation and imaging research were carried out in this paper. The results
indicate that when a seismic source near the roadway is excited, a part of
seismic wave propagates along the roadway direction, namely direct P-wave,
direct S-wave and direct Love channel wave.When the body waves and Love channel wave
propagating to the outsideof
working face meet the interface of collapse column, the reflected Love channel
wave and reflected body waves are generated.Reflection body waves and direct waves are mixed in time domain, which is difficult to
identify in seismic records, while reflected Love channel wave whose amplitude
is relatively strong. The reflected Love channel wave which has a large interval from other wave trains in
the time domain is easily recognizable in seismic record,whichmakes it suitable for
advanced detection of collapse column. The signal-to-noise ratio of X component
is higher than that of Y component and Z component. According to the seismic
records, polarization filtering was carried out to enhance the effective wave,
which removed the interference waves, and the signal was migrated to get the
position parameters of collapse column interface, which was basically
consistent with the model position.
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