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Experimental investigation on the fracture behaviour of black shale by acoustic emission monitoring and CT image analysis during uniaxial compression
Wang, Y.1,2; Li, C. H.1,2; Hu, Y. Z.3
2018-04-01
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
Volume213Issue:1Pages:660-675
AbstractPlenty of mechanical experiments have been done to investigate the deformation and failure characteristics of shale; however, the anisotropic failure mechanism has not been well studied. Here, laboratory Uniaxial Compressive Strength tests on cylindrical shale samples obtained by drilling at different inclinations to bedding plane were performed. The failure behaviours of the shale samples were studied by real-time acoustic emission (AE) monitoring and post-test X-ray computer tomography (CT) analysis. The experimental results suggest that the pronounced bedding planes of shale have a great influence on the mechanical properties and AE patterns. The AE counts and AE cumulative energy release curves clearly demonstrate different morphology, and the 'U'-shaped curve relationship between the AE counts, AE cumulative energy release and bedding inclination was first documented. The post-test CT image analysis shows the crack patterns via 2-D image reconstructions, an index of stimulated fracture density is defined to represent the anisotropic failure mode of shale. What is more, the most striking finding is that the AE monitoring results are in good agreement with the CT analysis. The structural difference in the shale sample is the controlling factor resulting in the anisotropy of AE patterns. The pronounced bedding structure in the shale formation results in an anisotropy of elasticity, strength and AE information from which the changes in strength dominate the entire failure pattern of the shale samples.
KeywordDefects Geomechanics Geopotential theory
DOI10.1093/gji/ggy011
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program
WOS KeywordMECHANICAL-PROPERTIES ; ANISOTROPIC PROPERTIES ; CONFINING PRESSURES ; TOURNEMIRE SHALE ; OPALINUS CLAY ; STRESS ; ROCKS ; BRITTLENESS ; TEMPERATURE ; STRENGTH
Language英语
Funding ProjectNational Natural Science Foundation of China[41502294] ; Fundamental Research Funds for the Central Universities[2302017FRF-TP-17-027A1] ; National key technologies Research and Development program[2017YFC0804609]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; National key technologies Research and Development program ; National key technologies Research and Development program
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000448715000042
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/89149
Collection页岩气与地质工程院重点实验室
Corresponding AuthorWang, Y.
Affiliation1.Univ Sci & Technol Beijing, Beijing Key Lab Urban Underground Space Engn, Dept Civil Engn, Sch Civil & Resource Engn, Beijing 100083, Peoples R China
2.Univ Sci & Technol Beijing, Key Lab, Minist Educ China High Efficient Min & Safety Met, Beijing 100083, Peoples R China
3.Chinese Acad Sci, Key Lab Shale Gas & Geoengn, Inst Geol & Geophys, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Wang, Y.,Li, C. H.,Hu, Y. Z.. Experimental investigation on the fracture behaviour of black shale by acoustic emission monitoring and CT image analysis during uniaxial compression[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,213(1):660-675.
APA Wang, Y.,Li, C. H.,&Hu, Y. Z..(2018).Experimental investigation on the fracture behaviour of black shale by acoustic emission monitoring and CT image analysis during uniaxial compression.GEOPHYSICAL JOURNAL INTERNATIONAL,213(1),660-675.
MLA Wang, Y.,et al."Experimental investigation on the fracture behaviour of black shale by acoustic emission monitoring and CT image analysis during uniaxial compression".GEOPHYSICAL JOURNAL INTERNATIONAL 213.1(2018):660-675.
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