The role of flaws on crack growth in rock-like material assessed by AE technique

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• 作者：Quansheng Liu ; Jie Xu ; Xuewei Liu ; Jingdong Jiang…
• 关键词：Rock ; like samples ; AE and photographic monitoring ; Crack coalescence and failure ; Real time ; AE location method ; Fracture mechanism
• 刊名：International Journal of Fracture
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：193
• 期：2
• 页码：99-115
• 全文大小：4,496 KB
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• 作者单位：Quansheng Liu (1) (2)
  Jie Xu (1)
  Xuewei Liu (2)
  Jingdong Jiang (1)
  Bin Liu (2)
  
  1. School of Civil Engineering, Wuhan University, Wuhan, 430072, Hubei, People’s Republic of China
  2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Characterization and Evaluation Materials
  Mechanics
  Civil Engineering
  Automotive and Aerospace Engineering and Traffic
  Mechanical Engineering
  
• 出版者：Springer Netherlands
• ISSN：1573-2673

文摘

Experiments for the rectangular rock-like samples (made of high-strength gypsum and water–cement ratio is 1) with two parallel pre-existing flaws subjected to uniaxial compression were carried out to further investigate the influence of varying flaw geometries on mechanical properties and crack coalescence behaviors. According to the tests results, eight crack types were characterized on a basis of the mechanisms of crack nucleation, formation and propagation, and seven coalescence modes occurred through the ligament, including S-mode, M1-mode, M2-mode, M3-mode, T1-mode, T2-mode and T3-mode. The AE and photographic monitoring techniques were adopted to further clarify the procedure of the crack coalescence and failure during uniaxial compression tests and in consequence the whole process of crack emergence, growth, coalescence and failure was recorded in real time. The results of AE technique revealed that the characteristics of acoustic emission energy associate with crack coalescence modes, and AE location method can emphasize the moments of crack occurrences and follow the crack growth until final failure. This study put forward better understanding of the fracture and failure mechanism of underground rock engineering, like rock burst.