IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v289y2024ics0360544223035132.html
   My bibliography  Save this article

Dynamic pore-fracture characteristic and evolution influenced by the underground mining considering the in-situ stress

Author

Listed:
  • Zhang, Tong
  • Tang, Ming
  • Yuan, Liang
  • Liu, Zegong
  • Ju, Yiwen
  • Xie, Zhizheng

Abstract

The in-situ pore-fracture development is crucial for the methane drainage during underground mining. In this study, the dynamic characteristic and evolution mechanism of the internal pore-fracture structure located at the mining face were investigated by a self-developed true triaxial coupling nuclear magnetic resonance (NMR) experiment system, considering the mining-induced in-situ stress. The mechanical response characteristics, pore-fracture distribution, morphology and connectivity of coal were analyzed through the T2 spectrum and magnetic resonance imaging (MRI). The result shows that the pore-fracture of the coal is composed of adsorption pore (58%–67 %, AP＜1.5 ms), seepage pore (28%–43 %, 1.5 ms＜SP＜98 ms) and migration pore (2.3%–7.5 %, 98 ms＜MP). The compression, pore-dilation, and crack and fracture creation are successively occurred responding to the stress loading. The dynamic drop, slight increase and stabilization were sequentially presented in pore volume, while pore distribution gradually approached the homogeneity, which was mainly contributed by the evolution of SP and MP. The development-, transformation- and mixture-type pore-fracture, occurred at lower in-situ stress (LISS), middle in-situ stress (MISS), and high in-situ stress (HISS), was dominated by the SP-MP, AP-SP-MP, and SP-MP respectively. The fractal dimension experienced the sharp drop, dynamic increase and dramatic decrease with the dynamic- and slight-variation amplitude were observed at LISS, HISS and MISS, respectively. A slight increase of the number in connected channels was formed by the transformation-dependent AP and mixture-dependent AP and MP for LISS and HISS, while the dynamic increase of connective channel was created by the developed crack and fracture. The optimal methane channels were presented the elastic-plastic period with mature SP-MP pore-fracture in HISS, AP in MISS, and SP-MP in LISS. The finding provides insight into the co-mining of coal and methane.

Suggested Citation

  • Zhang, Tong & Tang, Ming & Yuan, Liang & Liu, Zegong & Ju, Yiwen & Xie, Zhizheng, 2024. "Dynamic pore-fracture characteristic and evolution influenced by the underground mining considering the in-situ stress," Energy, Elsevier, vol. 289(C).
    • Handle: RePEc:eee:energy:v:289:y:2024:i:c:s0360544223035132
    DOI: 10.1016/j.energy.2023.130119
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544223035132
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2023.130119?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    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:eee:energy:v:289:y:2024:i:c:s0360544223035132. 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.

    We have no bibliographic references for this item. You can help adding them by using 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: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/energy .

    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.