Author(s)

Huachao Sun^1*, Huide Zhang², Jinyun Wang³, Xianzhuang Lv⁴, Xin Ding¹, Shiyu Xing⁴, Heng Zhang⁴

¹China University of Mining and Technology, School of Resources and Geophysics, Xuzhou, China.
²Shang Dong Energy Linyi Group Luxi Coalmine, Jining, China.
³Kaijia Group Yitang Changyuan Coalmine, Jiexiu, China.
⁴China University of Mining and Technology, School of Mechanics and Civil Engineering, Xuzhou, China.

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.

Reflected Love Channel Wave, 3D Numerical Simulation, Collapse Column, Wave Field Characteristics, Migration Imaging

Sun, H. , Zhang, H. , Wang, J. , Lv, X. , Ding, X. , Xing, S. and Zhang, H. (2020) Study on Wave Field Characteristics and Imaging of Collapse Column in Three-Dimensional Detection with Love Channel Wave Reflected outside the Working Face. Open Journal of Geology, 10, 1027-1039. doi: 10.4236/ojg.2020.1011048.