Evaluation and classification of rock heterogeneity based on acoustic emission detection

Tongzhao Zhang; Hongguang Ji; Xiaobo Su; Shuang You; Daolu Quan; Zhou Zhang; Jinzhe Li

doi:10.1007/s12613-021-2381-4

Volume 29 Issue 12

Dec. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(12): 2117-2125

Tongzhao Zhang, Hongguang Ji, Xiaobo Su, Shuang You, Daolu Quan, Zhou Zhang, and Jinzhe Li, Evaluation and classification of rock heterogeneity based on acoustic emission detection, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2117-2125. https://doi.org/10.1007/s12613-021-2381-4

Cite this article as:

Tongzhao Zhang, Hongguang Ji, Xiaobo Su, Shuang You, Daolu Quan, Zhou Zhang, and Jinzhe Li, Evaluation and classification of rock heterogeneity based on acoustic emission detection, Int. J. Miner. Metall. Mater., 29(2022), No. 12, pp. 2117-2125. https://doi.org/10.1007/s12613-021-2381-4

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Research Article

Evaluation and classification of rock heterogeneity based on acoustic emission detection

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Corresponding author:
Hongguang Ji E-mail: jihongguang@ces.ustb.edu.cn
Received: 1 September 2021; Revised: 11 November 2021; Accepted: 12 November 2021; Available online: 16 November 2021

Abstract

Abstract

For deep rock mechanics and subsurface engineering, accurately characterizing and evaluating rock heterogeneity as well as analyzing the correlation between the heterogeneity and physical and mechanical properties of rocks are critical. This study investigated the characteristics of acoustic emission signals produced in the process of strong and weak phase damage to rocks. The failure mechanisms of the strong and weak phases were analyzed by performing Brazilian splitting tests on different metagabbros and granites. The strong–weak phase ratio of the rocks and the uniformity of their spatial distribution were characterized. Test results show that as the feldspar develops, the strong-phase ratio of the metagabbro increases. However, the spatial distribution of feldspar minerals in the metagabbro becomes less uniform. The mineral spatial distribution uniformity in the altered granite is good; however, its strong-phase ratio is low. Furthermore, the strong-phase ratio of the typical granite is high; however, its mineral spatial distribution uniformity is poor. Moreover, uniaxial and triaxial test results show that the peak strength and elastic modulus of the rocks are related to the strong–weak phase ratio and mineral spatial distribution uniformity of the rocks. This study provides a new analytical method for the mechanical evaluation of deep rocks.
- acoustic emission;
- rock heterogeneity;
- rock classification;
- rock mechanics

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