关键词: 微震, 采动地震波, 煤岩传播介质, 传播特性, 衰减特性

Abstract: This study is aimed to analyze the seismic wave response of coal and rock induced by the mining and the corresponding characteristics of wave field. Multi-channel microseismic monitoring system was installed for monitoring the propagation of the mining seismic wave in the rock roof and coal seam. Then the propagation and attenuation characteristics of mining seismic waves in two propagation media were further analyzed. Research results indicate the average velocity and acceleration of the mining seismic wave received by the rock roof are higher than those received by the coal seam. The accelerations of mining seismic waves in two media were both proportional to the explosive charge, but negatively correlated with propagation distance and medium density. The energy and signal duration of the mining micro-seismic wave showed exponential and linear attenuations with the propagation distance, respectively. The energy and signal duration in the coal seam near the explosive center were higher than those in the roof, while the energy and signal duration in the roof were higher than those in the coal seam after a certain propagation distance. The propagation distance of mining micro-seismic wave was limited, and the effective propagation distance in the roof was higher than that in the coal seam. Meanwhile, the effective seismic wave propagation distance was linearly and positively correlated with the explosive charge. The quality factors of the low frequency part of the mining seismic waves were higher than those of the high frequency part, and quality factors of the rock roof were higher than those of the coal seam. The research results contribute to the selection of the seismic wave propagation medium and optimization of the detector layout.

Key words: microseismicity, seismic wave induced by mining effect, coal and rock propagating medium, propagation characteristics, attenuation characteristics