IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v13y2020i12p3295-d376913.html
   My bibliography  Save this article

Acoustic Emission Characteristics of Coal Samples under Different Stress Paths Corresponding to Different Mining Layouts

Author

Listed:
  • Yiming Yang

    (State Key Laboratory of Hydraulics and Mountain River Engineering, College of Hydraulic and Hydropower Engineering, Sichuan University, Chengdu 610065, China)

  • Ting Ai

    (MOE Key Laboratory of Deep Earth Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China)

  • Zetian Zhang

    (State Key Laboratory of Hydraulics and Mountain River Engineering, College of Hydraulic and Hydropower Engineering, Sichuan University, Chengdu 610065, China)

  • Ru Zhang

    (State Key Laboratory of Hydraulics and Mountain River Engineering, College of Hydraulic and Hydropower Engineering, Sichuan University, Chengdu 610065, China)

  • Li Ren

    (MOE Key Laboratory of Deep Earth Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China)

  • Jing Xie

    (State Key Laboratory of Hydraulics and Mountain River Engineering, College of Hydraulic and Hydropower Engineering, Sichuan University, Chengdu 610065, China)

  • Zhaopeng Zhang

    (MOE Key Laboratory of Deep Earth Science and Engineering, School of Architecture and Environment, Sichuan University, Chengdu 610065, China)

Abstract

Research on the mining-induced mechanical behavior and microcrack evolution of deep-mined coal has become increasingly important with the sharp increase in mining depth. For rock units in front of the working face, the microcrack evolution characteristics, structural characteristics, and stress state correspond well to mining layouts and depths under deep mining. The acoustic emission (AE) characteristics of typical coal under deep mining were obtained by conducting laboratory experiments to simulate mining-induced behavior and utilizing AE techniques to capture the variation in AE temporal and spatial parameters in real time, which provide an important basis for studying the rupture mechanisms and mechanical behavior of deep-mined coal. The findings were as follows: (1) AE activity under deep mining was characterized by three stages, corresponding to crack initiation, crack stable propagation, and crack unstable propagation. As the three stages proceeded, the AE counting rate and AE energy rate presented stronger clustering characteristics, and the cumulative AE counting and cumulative AE energy exhibited a sharp increase by an order of magnitude. (2) The crack initiation and the main stages of crack propagation were determined by characteristic points of variation curves in the AE parameters over time. In the main crack propagation stage, the number of cumulative AE events and the cumulative AE counts were similar among the three mining conditions, while coal samples under coal pillar mining released the largest amount of AE energy. The amount of accumulated AE energy released by coal samples increased by one order of magnitude according to the sequence of protective coal-seam mining, top-coal caving mining, and nonpillar mining. (3) Fractal technology was applied to quantitatively analyze the AE spatial evolution process, showing that the fractal dimension of the AE location decreased as the peak stress increased, corresponding to protective seam mining, caving-coal mining, and nonpillar mining. The above results showed that the deformation and fracture characteristics of coal under deep mining followed a general law, but were affected by different mining conditions. The crack initiation and main rupture activity of coal occurred earlier under the conditions of protective seam mining, top-coal caving mining, and nonpillar mining, successively. Moreover, nonpillar mining induced the strongest and highest degree of unstable rupture of the coal body in front of the working face.

Suggested Citation

  • Yiming Yang & Ting Ai & Zetian Zhang & Ru Zhang & Li Ren & Jing Xie & Zhaopeng Zhang, 2020. "Acoustic Emission Characteristics of Coal Samples under Different Stress Paths Corresponding to Different Mining Layouts," Energies, MDPI, vol. 13(12), pages 1-13, June.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3295-:d:376913
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/13/12/3295/pdf
    Download Restriction: no

    File URL: https://www.mdpi.com/1996-1073/13/12/3295/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Su, Fa-qiang & Itakura, Ken-ichi & Deguchi, Gota & Ohga, Koutarou, 2017. "Monitoring of coal fracturing in underground coal gasification by acoustic emission techniques," Applied Energy, Elsevier, vol. 189(C), pages 142-156.
    2. Liang Wang & Yuan-ping Cheng & Feng-hua An & Hong-xing Zhou & Sheng-li Kong & Wei Wang, 2014. "Characteristics of gas disaster in the Huaibei coalfield and its control and development technologies," 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. 71(1), pages 85-107, March.
    3. Kong, Shengli & Cheng, Yuanping & Ren, Ting & Liu, Hongyong, 2014. "A sequential approach to control gas for the extraction of multi-gassy coal seams from traditional gas well drainage to mining-induced stress relief," Applied Energy, Elsevier, vol. 131(C), pages 67-78.
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Ting Liu & Baiquan Lin & Quanle Zou & Chuanjie Zhu, 2016. "Microscopic mechanism for enhanced coal bed methane recovery and outburst elimination by hydraulic slotting: A case study in Yangliu mine, China," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(5), pages 597-614, October.
    2. Haijun Guo & Zhixiang Cheng & Kai Wang & Baolin Qu & Liang Yuan & Chao Xu, 2020. "Coal permeability evolution characteristics: Analysis under different loading conditions," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 10(2), pages 347-363, April.
    3. Haiqing Shuang & Weitao Meng & Yulong Zhai & Peng Xiao & Yu Shi & Yu Tian, 2022. "Application and Optimization of the Parameters of the High-Level Boreholes in Lateral High Drainage Roadway," Sustainability, MDPI, vol. 14(24), pages 1-18, December.
    4. Su, Fa-qiang & Wu, Jun-bo & Tao-Zhang, & Deng, Qi-chao & Yu, Yi-he & Hamanaka, Akihiro & Dai, Meng-Jia & Yang, Jun-Nan & He, Xiao-long, 2023. "Study on the monitoring method of cavity growth in underground coal gasification under laboratory conditions," Energy, Elsevier, vol. 263(PE).
    5. Hao Zhang & Lehua Xu & Mengmeng Yang & Cunbao Deng & Yuanping Cheng, 2022. "Pressure Relief Mechanism and Gas Extraction Method during the Mining of the Steep and Extra-Thick Coal Seam: A Case Study in the Yaojie No. 3 Coal Mine," Energies, MDPI, vol. 15(10), pages 1-17, May.
    6. Kalantari, Hosein & Ali Ghoreishi-Madiseh, Seyed, 2023. "Study of mine exhaust heat recovery with fully-coupled direct capture and indirect delivery systems," Applied Energy, Elsevier, vol. 334(C).
    7. Fa-qiang Su & Akihiro Hamanaka & Ken-ichi Itakura & Gota Deguchi & Wenyan Zhang & Hua Nan, 2018. "Evaluation of a Compact Coaxial Underground Coal Gasification System Inside an Artificial Coal Seam," Energies, MDPI, vol. 11(4), pages 1-11, April.
    8. Chao Xu & Mingyue Cao & Kai Wang & Qiang Fu & Liangliang Qin, 2021. "Mining‐disturbed coal damage and permeability evolution: Model and validation," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 11(2), pages 210-221, April.
    9. Yuteng Xiao & Jihang Yin & Yifan Hu & Junzhe Wang & Hongsheng Yin & Honggang Qi, 2019. "Monitoring and Control in Underground Coal Gasification: Current Research Status and Future Perspective," Sustainability, MDPI, vol. 11(1), pages 1-14, January.
    10. Hao Liu & Xiaoquan Li & Xiaoyan Liu & Yunjie Sun & Zhiwen Yang & Yuankun Zhong, 2023. "Rule Study on the Risk of Floor Water Inrush Based on the Plate Model Theory," Sustainability, MDPI, vol. 15(10), pages 1-17, May.
    11. Yubing Gao & Dongqiao Liu & Xingyu Zhang & Manchao He, 2017. "Analysis and Optimization of Entry Stability in Underground Longwall Mining," Sustainability, MDPI, vol. 9(11), pages 1-19, November.
    12. Fan, Lurong & Wang, Binyu & Song, Xiaoling, 2023. "An authority-enterprise equilibrium differentiated subsidy mechanism for promoting coalbed methane extraction in multiple coal seams," Energy, Elsevier, vol. 263(PA).
    13. Deyu Qian & Nong Zhang & Dongjiang Pan & Zhengzheng Xie & Hideki Shimada & Yang Wang & Chenghao Zhang & Nianchao Zhang, 2017. "Stability of Deep Underground Openings through Large Fault Zones in Argillaceous Rock," Sustainability, MDPI, vol. 9(11), pages 1-28, November.
    14. Wilhelm Jan Tic & Joanna Guziałowska-Tic, 2019. "The Effect of Modifiers and Method of Application on Fine-Coal Combustion," Energies, MDPI, vol. 12(23), pages 1-15, November.
    15. Galina Nyashina & Pavel Strizhak, 2018. "Impact of Forest Fuels on Gas Emissions in Coal Slurry Fuel Combustion," Energies, MDPI, vol. 11(9), pages 1-16, September.
    16. Fangtian Wang & Cun Zhang & Ningning Liang, 2017. "Gas Permeability Evolution Mechanism and Comprehensive Gas Drainage Technology for Thin Coal Seam Mining," Energies, MDPI, vol. 10(9), pages 1-18, September.
    17. Guo, Hongguang & Zhang, Yujie & Zhang, Yiwen & Li, Xingfeng & Li, Zhigang & Liang, Weiguo & Huang, Zaixing & Urynowicz, Michael & Ali, Muhammad Ishtiaq, 2021. "Feasibility study of enhanced biogenic coalbed methane production by super-critical CO2 extraction," Energy, Elsevier, vol. 214(C).
    18. Liang Cheng & Zhaolong Ge & Jiufu Chen & Hao Ding & Lishuang Zou & Ke Li, 2018. "A Sequential Approach for Integrated Coal and Gas Mining of Closely-Spaced Outburst Coal Seams: Results from a Case Study Including Mine Safety Improvements and Greenhouse Gas Reductions," Energies, MDPI, vol. 11(11), pages 1-16, November.
    19. Zenon Pilecki & Robert Hildebrandt & Krzysztof Krawiec & Elżbieta Pilecka & Zbigniew Lubosik & Tomasz Łątka, 2023. "Assessment of Combustion Cavern Geometry in Underground Coal Gasification Process with the Use of Borehole Ground-Penetrating Radar," Energies, MDPI, vol. 16(18), pages 1-14, September.
    20. Xiaowei Feng & Nong Zhang & Xiaoting Chen & Lianyuan Gong & Chuangxin Lv & Yu Guo, 2016. "Exploitation Contradictions Concerning Multi-Energy Resources among Coal, Gas, Oil, and Uranium: A Case Study in the Ordos Basin (Western North China Craton and Southern Side of Yinshan Mountains)," Energies, MDPI, vol. 9(2), pages 1-15, February.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3295-:d:376913. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: MDPI Indexing Manager (email available below). General contact details of provider: https://www.mdpi.com .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.