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Acoustic Emission Multi-Parameter Analysis of Dry and Saturated Sandstone with Cracks under Uniaxial Compression

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  • Hongru Li

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, Jiangsu, China)

  • Rongxi Shen

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, Jiangsu, China
    State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China)

  • Dexing Li

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, Jiangsu, China)

  • Haishan Jia

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, Jiangsu, China)

  • Taixun Li

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, Jiangsu, China)

  • Tongqing Chen

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, Jiangsu, China)

  • Zhenhai Hou

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
    Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou 221116, Jiangsu, China)

Abstract

In order to study the mechanics and acoustic emission (AE) characteristics of fractured rock under water-rock interaction, dried and saturated sandstone samples with prefabricated double parallel cracks were prepared. Then, uniaxial compression experiments were performed to obtain their AE signals and crack propagation images. The results show that water reduces the strength and fracture toughness of fractured sandstone and enhances plasticity. After saturation, the samples start to crack earlier; the cracks grow slowly; the failure mode is transformed from shear failure along the prefabricated cracks to combined shear and tensile failure; more secondary cracks are produced. The saturated samples release less elastic energy and weaker AE signals in the whole failure process. However, their AE precursor information is more obvious and advanced, and their AE sources are more widely distributed. Compared with dry specimens, the AE frequencies of saturated specimens in the early stage of loading are distributed in a lower frequency domain. Besides, the saturated samples release less complex AE signals which are dominated by small-scale signals with weaker multi-fractal characteristics. After discussion and analysis, it is pointed out that this may be because water makes rock prone to inter-granular fracture rather than trans-granular fracture. The water lubrication also may reduce the amplitude of middle-frequency band signals produced by the friction on the fracture surface. Multi-fractal parameters can provide more abundant precursory information for rock fracture. This is of great significance to the stability of water-bearing fractured rock mass and its monitoring, and is conducive to the safe exploitation of deep energy.

Suggested Citation

  • Hongru Li & Rongxi Shen & Dexing Li & Haishan Jia & Taixun Li & Tongqing Chen & Zhenhai Hou, 2019. "Acoustic Emission Multi-Parameter Analysis of Dry and Saturated Sandstone with Cracks under Uniaxial Compression," Energies, MDPI, vol. 12(10), pages 1-18, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:10:p:1959-:d:233274
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    References listed on IDEAS

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    1. Kong, Xiangguo & Wang, Enyuan & He, Xueqiu & Li, Dexing & Liu, Quanlin, 2017. "Time-varying multifractal of acoustic emission about coal samples subjected to uniaxial compression," Chaos, Solitons & Fractals, Elsevier, vol. 103(C), pages 571-577.
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    Cited by:

    1. Bin Miao & Xinyu Wang & Hongru Li, 2022. "Quantitative Analysis of Infrared Thermal Images in Rock Fractures Based on Multi-Fractal Theory," Sustainability, MDPI, vol. 14(11), pages 1-11, May.

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