Acoustic Emission Behavior of Rock-Like Material Containing Two Flaws in the Process of Deformation Failure

Many sudden disasters (such as rock burst) by mining extraction originate in crack initiation and propagation. Meanwhile a large number of shock waves are produced by rock deformation and failure. With the purpose of investigating crack coalescence and failure mechanism in rock, experimental researc...

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Bibliographic Details
Published in:Shock and vibration 2015-01, Vol.2015 (2015), p.1-9
Main Authors: Jiang, Jing-Dong, Liu, Bin, Xu, Jie, Liu, Quan-Sheng
Format: Article
Language:English
Subjects:
Acoustic emission testing
Coalescence
Coalescing
Crack initiation
Defects
Disasters
Emergency management
Failure
Fracture mechanics
Methods
Rock
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Summary:Many sudden disasters (such as rock burst) by mining extraction originate in crack initiation and propagation. Meanwhile a large number of shock waves are produced by rock deformation and failure. With the purpose of investigating crack coalescence and failure mechanism in rock, experimental research of rock-like materials with two preexisting flaws was performed. Moreover, the AE technique and photographic monitoring were adopted to clarify further the procedure of the crack coalescence and failure. It reveals that AE location technique can record the moments of crack occurrences and follow the crack growth until final failure. Finally, the influence of different flaw geometries on crack initiation strength is analyzed in detail. This research provides increased understanding of the fracture mechanism of mining-induced disasters.
ISSN:1070-9622
1875-9203
DOI:10.1155/2015/167580