Abstract
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 outside of 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, which makes 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.
Highlights
Collapse column is a typical geological structure in coal mining in North and South China
When the body waves and Love channel wave propagating to the outside of 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
Summary
Collapse column is a typical geological structure in coal mining in North and South China. Li Guangyi et al used channel wave seismic transmission method to detect the collapse column in field and circled the range of the collapse column, which effectively guided the actual production [10]. In 2019, Ma Xin et al studied the collapse column of the coal mining work face detected by the transmission channel wave through numerical simulation [11]. Mason et al conducted an experimental study on the detection of faults in working face using reflected channel wave in the Pye Hill coal mine. Based on the above problems, this paper uses numerical simulation to study the detection of collapse column by using reflected Love channel wave outside the working face. The development and distribution of the internal structure of the working face are detected by reflected channel wave
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