煤岩组合体跨界面压裂及声发射响应特征试验研究

doi:10.13722/j.cnki.jrme.2018.1192

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Abstract The self-developed “TCHFSM-I” large-scale true triaxial hydraulic fracturing seepage simulation device was used to study the crack initiation and propagation in coal-rock blocks under different stress conditions，and the hydraulic pressure and acoustic emission event evolutions were also analyzed. The results show that，when the difference of the axial stress and the minimum horizontal principal stress was equal or greater than 6 MPa，the hydraulic cracks can extend into coal across the interface，otherwise extend along the interface. The hydraulic pressure and acoustic emission response characteristics can well reflect the behaviors of hydraulic fractures across the interface. When the hydraulic cracks extend into the coal，the hydraulic pressure shows a significant secondary rise，and the cumulative number of the acoustic emission events increases significantly at a rate of 51.4%，most of which occur in coal. When the hydraulic cracks expand along the interface，the cumulative number of the acoustic emission events increases just by 6% and there is no secondary rise in fluid injection pressure. A crack expansion model crossing the interface，considering the angle between the crack and the interface，the interfacial friction and the stress state，was established，which can well describe and predict the crack expansion behavior crossing interfaces in hydraulic fractures. The research results in this paper can provide a technical guidance for efficient exploitation of coalbed methane.

Key words： rock mechanics coal-rock blocks hydraulic fracturing acoustic emission response crack expansion model crossing interface

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	Articles by authors
	IANG Yulong1
	2
	LIANG Weiguo1
	2
	LI Zhigang2
	3
	LIAN Haojie1
	2
	WU Pengfei1
	2
	GENG Yide1
	2
	YAO Hongbo1
	2

Cite this article:

IANG Yulong1,2,LIANG Weiguo1, et al. Experimental study on fracturing across coal-rock interfaces and the acoustic emission response characteristics[J]. , 2019, 38(5): 875-887.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1192 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I5/875

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