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Acoustic emission location analysis and microcracks’ nature determination of uniaxially compressed calcitic marble hollow plates

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Abstract

The acoustic emission of hollow plate specimens of two calcitic marbles quarried in Greece is studied in the laboratory under uniaxial compression. Theses plate specimens are used as physical models, having a cylindrical opening of various sizes in the middle. Location analysis of the acoustic emission sources follows closely the macroscopic fracture surfaces, observed inside the collapsed physical models after the end of the experiments. The located AE signals’ sources are determined as either tensile or shear, according to the average frequency AF–RA value analysis. It is found that tensile AE signals’ sources dominate during fracturing of the studied physical models, from the onset of the fracturing development to their maximum strength. The overall percentage of the signals attributed to tensile AE sources is of the order of 90%, while most of the located shear AE sources are nucleated after the sidewall’s rock failure. The potential of the acoustic emission technique stands out, as it is capable to distinguish the tensile or shear nature of the recorded AE signals, and to locate reliably the microcracking of such hollow specimens during the compression tests, at least for the currently studied marble varieties.

Article Highlights

  • AE location analysis is performable on hollow marble specimens in simple compression.

  • The nature of the marble’s microcracking is distinguishable by the AF–RA value analysis.

  • The marbles’ fracturing process is studied through 3D AE location in distinct time/test-steps.

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Correspondence to Michail A. Lotidis.

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Lotidis, M.A., Nomikos, P.P. Acoustic emission location analysis and microcracks’ nature determination of uniaxially compressed calcitic marble hollow plates. Geomech. Geophys. Geo-energ. Geo-resour. 7, 38 (2021). https://doi.org/10.1007/s40948-021-00237-6

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  • DOI: https://doi.org/10.1007/s40948-021-00237-6

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