深部煤矿强矿震震源参数分析及震源机制研究

doi:10.13722/j.cnki.jrme.2022.1213

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Abstract As the coal resource exploitation gradually goes deeper，large-energy mine tremors occur frequently in several mines in Shandong and Inner Mongolia，which seriously restrict the productivity and effectiveness of mining activities. The focal mechanism analysis of seisms is the precondition for early warning and prevention and control of strong mine tremors induced by coal seam extraction. This paper provides an in-depth analysis of 27 strong mine tremors that occurred during the mining process of panel 63upper06 in Dongtan coal mine. The fast Fourier transform (FFT) method is employed to process the seismic waveforms of strong mine tremors by using field monitoring and theoretical analysis. The corner frequency and low-frequency displacement amplitude are obtained by fitting the Savage source spectrum model. The internal relationship between the source parameters of strong mine tremors is analysed，as well as the scale and occurrence of source rupture are calculated effectively. Based on the moment tensor inversion and occurrence of source rupture，the focal mechanism solutions of strong mine tremors are determined in Dongtan coal mine. The results show that the focal mechanism of these strong mine tremors is dominated by shear failure，followed by mixed shear failure. The overlying thick and hard rock strata above the coal seam are fractured and faulted along the advancing direction of the working face and the transverse direction of the adjacent goaf，respectively. We believe the two forming types of strong seisms cross each other and promote each other. The violent movement and instantaneous fracture of the overlying thick and hard rock strata caused by coal seam mining are the main reason for the frequent occurrence of strong mine seismic events.

Key words： mining engineering deep mines strong mine tremor focal mechanism source parameter moment tensor inversion P-T projection

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	Articles by authors
	WU Kunbo
	ZOU Junpeng
	JIAO Yuyong
	HU Xiaoyue

Cite this article:

WU Kunbo,ZOU Junpeng,JIAO Yuyong, et al. Study on the internal relationship of source parameters and focal mechanism of strong mine tremors in deep coal mines[J]. , 2023, 42(10): 2540-2551.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1213 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I10/2540

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