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Study on Wave Field Characteristics and Imaging of Collapse Column in Three-Dimensional Detection with Love Channel Wave Reflected outside the Working Face

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Document pages: 13 pages

Abstract: The safety accidents caused by collapse column water diversion occurfrequently, which has great hidden danger to the safety production of coalmine. Limited by the space of underground, the detection of collapse column onthe outside of working face has been a difficult problem. Based on this,numerical simulation and imaging research were carried out in this paper. The resultsindicate that when a seismic source near the roadway is excited, a part ofseismic 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 wavepropagating to the outside ofworking face meet the interface of collapse column, the reflected Love channelwave and reflected body waves are generated. Reflection body waves and direct waves are mixed in time domain, which is difficult toidentify in seismic records, while reflected Love channel wave whose amplitudeis relatively strong. The reflected Love channel wave which has a large interval from other wave trains inthe time domain is easily recognizable in seismic record, which makes it suitable foradvanced detection of collapse column. The signal-to-noise ratio of X componentis higher than that of Y component and Z component. According to the seismicrecords, polarization filtering was carried out to enhance the effective wave,which removed the interference waves, and the signal was migrated to get theposition parameters of collapse column interface, which was basicallyconsistent with the model position.

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