断层黏滑失稳过程声发射特征试验研究

doi:10.13722/j.cnki.jrme.2021.0948

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Abstract In order to study the acoustic emission characteristics during the stick-slip process of fault，friction-slip experiments were carried out on the prefabricated coarse-grained syenite fault model with different dip angles，and the evolution process of the acoustic emission characteristics of fault stick-slip instability under different loading rates and lateral pressures was analyzed. The results show that：(1) In a stick-slip process，the number of acoustic emission events in the stress accumulation stage increases steadily，and the acoustic emission energy levels are relatively small；when the fault is unstable，the acoustic emission events increase suddenly，and accompanied by high-level acoustic emission event，the energy is much greater than other events，indicating that more and more intense acoustic emission activities are produced when the fault is unstable，and the sudden increase in acoustic emission energy occurs in the sub-instability stage of the fault，and the occurrence of high-energy acoustic emission events can be used to the fault stick-slip predicted. (2) The stick-slip characteristics of faults are different under different loading conditions. When the lateral pressure and dip angle change，the stress state of the fault plane affects the contact state of the concave and convex body，and the macroscopic expression is the change of friction strength of the fault plane. With the increase of lateral pressure，the shear stress of slip-induced fault increases and the stress drop increases. When the inclination angle changes from 34°to 45°，sticky-slip is less likely to occur，and the strain energy released during instability is greater. The peak stress of sticky-slip event increases continuously at the inclination angle of 45°，while the shear stress of fault plane increases continuously at the inclination angle of 56°，but sticky-slip does not occur. When the loading rate decreases，the stick-slip period becomes longer，and there is a relatively long time for adjustment and physical healing between the interrupted planes during the loading process. The stress state of the fault plane changes，and the stress drop of fault instability increases. (3) When loading conditions change，acoustic emission characteristics change. When the lateral pressure increases，the growth rate of AE count increases，and the AE activity becomes more frequent. At the same time，the amplitude of high frequency increases，and the generation and expansion of fault micro-rupture become more complicated. When the dip angle changes from 34° to 45°，the amplitude of low-frequency signal increases significantly，which indicates that the change of dip angle makes the fault appear larger micro-rupture.

Key words： rock mechanics stick-slip straight fault fault dip lateral pressure acoustic emission

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	ZHAO Yangfeng1
	FAN Yi1
	JING Gang2
	LIU Yuchun1
	3
	WANG Xuebin1

Cite this article:

ZHAO Yangfeng1,FAN Yi1,JING Gang2, et al. Experimental study on acoustic emission characteristics in the process of fault stick-slip instability[J]. , 2022, 41(S2): 3101-3113.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0948 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3101

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