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Experimental Investigation on Influence Factors of Acoustic Emission Activity in Coal Failure Process

Author

Listed:
  • Huiming Yang

    (State Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China
    Gas Research Branch, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China)

  • Guangcai Wen

    (State Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China
    Gas Research Branch, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China)

  • Qianting Hu

    (State Key Laboratory of Coal Mine Disaster Dynamics and CONTROL, Chongqing University, Chongqing 400044, China)

  • Yuanyuan Li

    (Department of Basic Courses, Chongqing Jianzhu College, Chongqing 400072, China)

  • Linchao Dai

    (State Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China
    Gas Research Branch, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China)

Abstract

Stress-dominated coal and gas outburst disaster has become one of the main safety problems in deep coal mines. Acoustic emission (AE) or microseismic technology has been viewed as a promising method that can effectively reflect the stress and stability status of rock mass. The AE activity precursor of coal failure is the theoretical basis of this technology. In this study, AE experiments in failure process of coal specimens with different properties and under different stress conditions were performed in laboratory to explore influence factors and their effect of AE activity, and AE activity pattern classification was proposed based on the failure type of coal. The results indicate that the AE activity of different coals under loading are associated with the failure phase, and the evolution pattern of AE activity depends on the failure type of stressed coal. Both the mechanical property and the external stress condition have an important influential effect on the failure type and AE activity pattern in coal failure process. The internal mechanical property decides the inherent tendency of stressed coals to perform brittle or ductile behavior, and the responded AE activity pattern. The contrast of fissure distribution of specimens suggested that fissure structure in coal significantly affects the fracturing mode of coal in uniaxial compression and the AE activity pattern. The external stress condition has a transition effect on AE event energy distribution and AE activity pattern. Under the effect of external stress condition, the energy distribution of AE events was transforming between relative disperse and relative concentration, the failure type and AE activity evolution pattern of coal could appear the brittle-ductile transition. Based on the view of failure type, the pattern of AE activity of coal failure can be classified into three types, i.e., ductile, brittle, and semi-brittle pattern. It is suggested that the high-level AE activity can be viewed as the precursor of brittle instability of coal, and relative quiet phenomenon of AE activity as the precursor of ductile or semi-brittle instability. The research achievement can provide a theoretical base for the prewarning criteria establishment of coal and rock dynamic disasters at depth and improve the insight of AE activity in the coal failure process.

Suggested Citation

  • Huiming Yang & Guangcai Wen & Qianting Hu & Yuanyuan Li & Linchao Dai, 2018. "Experimental Investigation on Influence Factors of Acoustic Emission Activity in Coal Failure Process," Energies, MDPI, vol. 11(6), pages 1-16, June.
  • Handle: RePEc:gam:jeners:v:11:y:2018:i:6:p:1414-:d:150032
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    References listed on IDEAS

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    1. Cai-Ping Lu & Lin-Ming Dou & Nong Zhang & Jun-Hua Xue & Guang-Jian Liu, 2014. "Microseismic and acoustic emission effect on gas outburst hazard triggered by shock wave: a case study," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(3), pages 1715-1731, September.
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    Cited by:

    1. Li Yang & Xin Fang & Xue Wang & Shanshan Li & Junqi Zhu, 2022. "Risk Prediction of Coal and Gas Outburst in Deep Coal Mines Based on the SAPSO-ELM Algorithm," IJERPH, MDPI, vol. 19(19), pages 1-18, September.
    2. Anlin Zhang & Ru Zhang & Mingzhong Gao & Zetian Zhang & Zheqiang Jia & Zhaopeng Zhang & Ersheng Zha, 2020. "Failure Behavior and Damage Characteristics of Coal at Different Depths under Triaxial Unloading Based on Acoustic Emission," Energies, MDPI, vol. 13(17), pages 1-21, August.
    3. Jie Liu & Qiuping Li & Jinduo Li & Zaiquan Wang & Shouqing Lu, 2022. "Experimental Investigation on Mechanical and Acoustic Emission Characteristics of Gassy Coal under Different Stress Paths," IJERPH, MDPI, vol. 19(13), pages 1-18, June.

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