断层黏滑失稳过程微震与电荷信号时频特征研究

doi:10.13722/j.cnki.jrme.2019.1025

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Abstract The characteristics of the fault stick-slip curve with different fault dip angles and confining pressure，and the time domain and frequency domain characteristics of microseism and charge induction signals in the process of fault stick-slip are inspected and analyzed by using the microseism and charge induction monitoring system and a large-scale double-axis test machine. The test material is a kind of coarse grained syenogranite. The results show that，in the biaxial loading process of oblique faults，the changes of the fault dip angle and the confining pressure changes the stress state of the fault plane，the characteristics of fault stick-slip curve and the stick-slip friction strength. The fault with a small dip angle is prone to stick slip with a small magnitude of energy release，while the fault with a large dip angle is not prone to stick slip and has a large stress drop when failure occurs. By analyzing the changes of the lateral pressure and the fault dip angle，the possibility of fault stick slip instability can be further judged. The possibility of fault stick-slip instability can be further judged by analyzing the changes of confining pressure and fault dip. High amplitude microseism and charge signals will be generated simultaneously at the moment of every oblique fault stick-slip and before the stress drop. The stress drop of fault stick-slip has a good corresponding relationship with the microseismic and charge signal intensity，and the charge signal amplitude at the fault is larger when the oblique fault is stick slip. With changing the fault dip or the lateral pressure，the amplitude and energy of charge signals have significant changes while microseismic signals almost keep unchanged. The frequency bands of both microseism and charge signals are in the range of 0-100 Hz with a main frequency less than 10 Hz. The frequency and power of microseism and charge signals increase before fault stick-slip and decrease rapidly after fault stick-slip. The test results show that the spectrum characteristics of microseism and charge signals have more obvious precursory characteristics than the signal amplitude. The time-frequency characteristics of microseisms and charge signals analyzed by Hilbert-Huang time-frequency analysis method can better identify the precursory information of fault stick-slip process.

Key words： rock mechanics stick-slip oblique fault fault dip microseismic charge induction time-frequency characteristics

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	Articles by authors
	ZHAO Yangfeng1
	JING Gang1
	FAN Yi1
	PAN Yishan1
	2

Cite this article:

ZHAO Yangfeng1,JING Gang1,FAN Yi1, et al. Experimental study on the microseism and charge signal time-frequency characteristics in the process of fault stick-slip instability#br#[J]. , 2020, 39(7): 1385-1395.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1025 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I7/1385

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