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Shock and Vibration
Volume 2015, Article ID 167580, 9 pages
http://dx.doi.org/10.1155/2015/167580
Research Article

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

1School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China
2Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China

Received 17 October 2014; Revised 14 February 2015; Accepted 17 February 2015

Academic Editor: Shimin Liu

Copyright © 2015 Quan-Sheng Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.