Crack-induced acoustic emission and anisotropy variation of brittle rocks containing natural fractures

doi:10.1093/jge/gxz031

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Crack-induced acoustic emission and anisotropy variation of brittle rocks containing natural fractures
	Zhang, Guokai ; Li, Haibo ; Wang, Mingyang ; Li, Xiaofeng ; Wang, Zhen ; Deng, Shuxin
刊名	JOURNAL OF GEOPHYSICS AND ENGINEERING
	2019
卷号	16 期号:3 页码:599-610
关键词	ultrasonic velocity acoustic emission anisotropy parameter natural fracture crack initiation AE hypocenters
ISSN号	1742-2132
DOI	10.1093/jge/gxz031
英文摘要	The acoustic emission (AE), ultrasonic velocity and stress-strain behaviors of brittle rocks containing natural fractures were simultaneously measured under uniaxial compression. An optimized sparse network of transducers was used to monitor the crack-induced AE activities and changes of velocities in different directions. The variation of rock anisotropy was co-characterized by wave velocity and localization of AE hypocenters. The microscale behaviors of rock failure were investigated by the analysis of AE waveforms and multiple characteristic parameters. A flurry of AEs behaving at low frequency and low amplitude appear even under a low stress level for fractured rocks. With an increase of stress, the initiation of cracks first occurs along the natural fracture accompany with increased dominant frequency, then decreases rapidly after the coalescence of cracks. The natural fracture is the main source of rock anisotropy, which decreases first as the pressure-induced closure of fracture, then increases with the opening of cracks along the fracture. For rocks with a higher inclined fracture, the anisotropy parameter is more sensitive to the initiation, propagation and coalescence of cracks. Unexpectedly, the increase of AEs occurs much earlier than the inflection of velocity, and AE hypocenters based on the time-variable velocity depicts the localization and propagation of cracks well. AE energy increases precipitously after 98% peak strength, accompanied with the sharp increase in the ratio of low-frequency AEs, which is a perfect precursor of potentially unstable nucleation.
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000473766300009
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14970]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Jiangsu, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 3.Army Engn Univ PLA, State Key Lab Disaster Prevent & Mitigat Explos &, Nanjing 210014, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Guokai,Li, Haibo,Wang, Mingyang,et al. Crack-induced acoustic emission and anisotropy variation of brittle rocks containing natural fractures[J]. JOURNAL OF GEOPHYSICS AND ENGINEERING,2019,16(3):599-610.
APA	Zhang, Guokai,Li, Haibo,Wang, Mingyang,Li, Xiaofeng,Wang, Zhen,&Deng, Shuxin.(2019).Crack-induced acoustic emission and anisotropy variation of brittle rocks containing natural fractures.JOURNAL OF GEOPHYSICS AND ENGINEERING,16(3),599-610.
MLA	Zhang, Guokai,et al."Crack-induced acoustic emission and anisotropy variation of brittle rocks containing natural fractures".JOURNAL OF GEOPHYSICS AND ENGINEERING 16.3(2019):599-610.