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Effect of heterogeneity on mechanical and acoustic emission characteristics of rock specimen

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Abstract

The influence of heterogeneity on mechanical and acoustic emission characteristics of rock specimen under uniaxial compress was studied with numerical simulation methods. Weibull distribution function was adopted to describe the mesoscopic heterogeneity of rocks. The failure process of heterogeneous rock specimen under uniaxial loading was simulated using FLAC3D software. Five schemes were adopted to investigate the influence of heterogeneity. The results demonstrate that as the homogeneity increases, the peak strength and brittleness of rocks increase, and the macro elastic modulus improves as well. Heterogeneity has great influence on macro elastic modulus and strength when the homogeneity coefficient is less than 20.0. The volume expansion is not so obvious when the homogeneity increases. As the homogeneity coefficient increases the acoustic emissions modes change from swarm shock to main shock. When the homogeneity coefficient is high, the cumulative acoustic emission events-axial strain curve is gentle before the rock failure. The numerical results agree with the previously numerical results and earlier experimental measurements.

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Authors and Affiliations

  1. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061, China

    Shu-cai Li  (李术才)

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  1. Shu-cai Li  (李术才)
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  2. Guo-ying Li  (李国莹)
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Corresponding author

Correspondence to Shu-cai Li  (李术才).

Additional information

Foundation item: Project(2007CB209407) supported by the National Basic Research Program of China; Project(50729904) supported by the National Natural Science Foundation of China

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Li, Sc., Li, Gy. Effect of heterogeneity on mechanical and acoustic emission characteristics of rock specimen. J. Cent. South Univ. Technol. 17, 1119–1124 (2010). https://doi.org/10.1007/s11771-010-0605-2

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  • DOI: https://doi.org/10.1007/s11771-010-0605-2

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