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Experimental Study of Creep Acoustic Emission Characteristics of Coal Bodies around Boreholes under Different Moisture Contents

Author

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  • Tianjun Zhang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Zhiqiang Ling

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Shaanxi Administration of Coal Mine Safety, Xi’an 710018, China)

  • Mingkun Pang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

  • Yukai Meng

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China)

Abstract

Water content is an important factor in the deformation-destruction process of coal bodies. To analyze the influence of water on the creep acoustic emission (AE) characteristics of coal rock surrounding a borehole, we conducted graded loading creep AE tests of single-hole specimens with different water contents (0%, 4%, 8% and water-saturation) under uniaxial loading. The findings include the following: the water content affects the creep mechanical properties of the coal body around a borehole. The creep transient strain and steady-state strain increased exponentially with rising water content; the saturated specimen showed the highest increase, reaching 44.5% and 28.6%, respectively. The specimen water content affected the cumulative ringing count (CRC) and the axial strain during creep. The axial strain increased with rising water content, the CRC increased linearly with rising axial strain. The higher the water content, the greater the CRC rise. At different stress levels, the CRC in the 4%, 8% and saturated water content specimens changed by 43%, 53% and 74%, respectively. The AE ringing rate showed a pattern of grow–decline–stabilize at each creep stage. The AEs decreased significantly with the rising water content and the creep curve lagged behind the AE data. This paper provides guidelines for gas extraction, borehole maintenance and AE detection.

Suggested Citation

  • Tianjun Zhang & Zhiqiang Ling & Mingkun Pang & Yukai Meng, 2021. "Experimental Study of Creep Acoustic Emission Characteristics of Coal Bodies around Boreholes under Different Moisture Contents," Energies, MDPI, vol. 14(11), pages 1-13, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:11:p:3103-:d:562618
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    References listed on IDEAS

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    1. Rongxi Shen & Xuan Zhang & Enyuan Wang & Hongru Li & Xu Han & Zhenhai Hou, 2019. "Application of Acoustic Emission Technique to the Evaluation of Coal Seam Hydraulic Flushing Effect," Energies, MDPI, vol. 12(9), pages 1-14, May.
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    Cited by:

    1. Renhui Cheng & Chao Zhang & Fuhuai Fan & Chenye Duan & Zhiheng Chen, 2023. "Research on Hole Collapse Monitoring Technology of Coal Seam Gas Extraction Boreholes," Sustainability, MDPI, vol. 15(13), pages 1-13, June.

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