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

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Abstract

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.

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Acknowledgments

Financial support from the National Basic Research Program of China (973 Program) Granted No. 2014CB046904 and the National Natural Science Foundation of China Granted Nos. 41130742 and 51474205 are gratefully acknowledged.

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Authors and Affiliations

  1. School of Civil Engineering, Wuhan University, Wuhan, 430072, Hubei, People’s Republic of China

    Quansheng Liu, Jie Xu & Jingdong Jiang

  2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei, People’s Republic of China

    Quansheng Liu, Xuewei Liu & Bin Liu

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  1. Quansheng Liu
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  2. Jie Xu
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  3. Xuewei Liu
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  4. Jingdong Jiang
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  5. Bin Liu
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Correspondence to Quansheng Liu.

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Liu, Q., Xu, J., Liu, X. et al. The role of flaws on crack growth in rock-like material assessed by AE technique. Int J Fract 193, 99–115 (2015). https://doi.org/10.1007/s10704-015-0021-6

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