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Volume 26 Issue 10
Oct.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(10): 1217-1230
Peng Li, Fen-hua Ren, Mei-feng Cai, Qi-feng Guo, Hao-fei Wang, and Kang Liu, Investigating the mechanical and acoustic emission characteristics of brittle failure around a circular opening under uniaxial loading, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1217-1230. https://doi.org/10.1007/s12613-019-1887-5
Cite this article as:
Peng Li, Fen-hua Ren, Mei-feng Cai, Qi-feng Guo, Hao-fei Wang, and Kang Liu, Investigating the mechanical and acoustic emission characteristics of brittle failure around a circular opening under uniaxial loading, Int. J. Miner. Metall. Mater., 26(2019), No. 10, pp. 1217-1230. https://doi.org/10.1007/s12613-019-1887-5
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研究论文

Investigating the mechanical and acoustic emission characteristics of brittle failure around a circular opening under uniaxial loading

  • School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education of China), University of Science and Technology Beijing, Beijing 100083, China

  • Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • 通讯作者:

    Fen-hua Ren    E-mail: renfh_2001@163.com

  • The size of underground openings in rock masses in metal mines is critical to the performance of the openings. In this study, the mechanical and acoustic emission (AE) characteristics of brittle rock-like specimens containing a circular opening with different ratios of opening diameter to sample size λ (λ=0.1, 0.13, 0.17, 0.2, and 0.23) were investigated under uniaxial compression with AE monitoring. The results indicate that the opening size strongly affected the peak strength and the elastic modulus. Crack initiation first started from the upper surface of the specimens, not from the periphery of the openings. Tensile and shear cracks coexisted on the roof and floor of the specimens, whereas tensile cracks were dominant on the two sides. The fracture mode of samples with openings was partially affected by the relative size of the pillars and openings. The AE response curves (in terms of counts, cumulative energy, cumulative counts, and b-value) show that brittle failure was mainly a progressive process. Moreover, the AE information corresponded well with microcrack evolution in the samples and thus can be used to predict sample failure.
    • Research Article

    Investigating the mechanical and acoustic emission characteristics of brittle failure around a circular opening under uniaxial loading

    + Author Affiliations
      Abstract
    • The size of underground openings in rock masses in metal mines is critical to the performance of the openings. In this study, the mechanical and acoustic emission (AE) characteristics of brittle rock-like specimens containing a circular opening with different ratios of opening diameter to sample size λ (λ=0.1, 0.13, 0.17, 0.2, and 0.23) were investigated under uniaxial compression with AE monitoring. The results indicate that the opening size strongly affected the peak strength and the elastic modulus. Crack initiation first started from the upper surface of the specimens, not from the periphery of the openings. Tensile and shear cracks coexisted on the roof and floor of the specimens, whereas tensile cracks were dominant on the two sides. The fracture mode of samples with openings was partially affected by the relative size of the pillars and openings. The AE response curves (in terms of counts, cumulative energy, cumulative counts, and b-value) show that brittle failure was mainly a progressive process. Moreover, the AE information corresponded well with microcrack evolution in the samples and thus can be used to predict sample failure.
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