Spectrum characteristics analysis of microseismic signals transmitting between coal bedding |
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Authors: | Chengwu Li Jikun Liu Cuixia Wang Jijun Li Hao Zhang |
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Institution: | a Faculty of Resources & Safety Engineering, China University of Mining & Technology, Beijing 100083, China b State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Beijing 100083, China c Shenyang Branch of China Coal Research Institute, Shenyang 110016, China |
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Abstract: | This study was performed to investigate the propagation law of microseismic signals transmitting along the direction parallel and vertical to the bedding in the process of coal rock rupture under uniaxial compression. Microseismic signals during the whole process of coal-rock deformation fracture until burst failure was tested by using the coal rock rupture microseismic experimental system. The empirical mode decomposition graphic, Hilbert spectrum and time-frequency spectrum were obtained by using Hilbert-Huang Transform or HHT. Also the microseismic signals transmitting along the direction parallel and vertical to the bedding in the process of coal rock rupture were spectrum comparative analyzed with EMD analysis method. Results show that amplitude and velocity of microseismic signals changed very small along the parallel direction to bedding in the process of propagation, but microseismic signals delayed and amplitude weakened obviously along the vertical direction to bedding. Signal delay and signal attenuation were confirmed that bedding impact on microseismic wave transmitting. |
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Keywords: | Coal rock Microseism signal Bedding Transmission Spectrum characteristic |
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