IDEAS home Printed from https://ideas.repec.org/a/gam/jsusta/v14y2022i20p13555-d948050.html
   My bibliography  Save this article

Patterns of Influence of Parallel Rock Fractures on the Mechanical Properties of the Rock–Coal Combined Body

Author

Listed:
  • Yakang Li

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qianwangang Road 579, Qingdao 266590, China)

  • Jiangwei Liu

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qianwangang Road 579, Qingdao 266590, China)

  • Qian Yu

    (College of Energy and Mining Engineering, Shandong University of Science and Technology, Qianwangang Road 579, Qingdao 266590, China)

Abstract

Hydraulic fracturing of a roof can attenuate the strong mineral pressure and stress transfer by creating a series of parallel artificial fractures in it, and different forms of hydraulic parallel fractures have different effects on the attenuation effect of the coal rock system. In this regard, this study investigated the influence law of different forms of parallel pre-cracks on the mechanical properties of a rock–coal combined body through PFC 2D numerical simulation, and the following conclusions were obtained. Parallel pre-cracks significantly affected the mechanical properties of the rock–coal combined body. The stress–strain curve of the coal–rock assemblage containing Parallel pre-cracks changes significantly following reductions in peak strength, peak strain, elastic modulus, and crack initiation stress. The closer the angle θ between the single set of parallel pre-cracks and the horizontal is to 30°, the longer the length, L, and the lower the peak strength of the specimen, the peak strain, the modulus of elasticity, and the crack initiation stress. Macroscopic damage patterns are given for a rock–coal combined body containing single sets of parallel pre-cracks of different parameters, with coal sample damage, coal–rock sample damage and rock sample damage; a rock–coal combined body containing parallel pre-cracks is divided into three modes of fracture initiation when pressurized. These are the cracking of the coal sample, the simultaneous cracking of the parallel pre-crack tips in coal and rock samples, and the cracking of the parallel pre-crack tips in rock samples.

Suggested Citation

  • Yakang Li & Jiangwei Liu & Qian Yu, 2022. "Patterns of Influence of Parallel Rock Fractures on the Mechanical Properties of the Rock–Coal Combined Body," Sustainability, MDPI, vol. 14(20), pages 1-17, October.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:20:p:13555-:d:948050
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/2071-1050/14/20/13555/pdf
    Download Restriction: no
    File URL: https://www.mdpi.com/2071-1050/14/20/13555/
    Download Restriction: no
    ---><---

    References listed on IDEAS

    as
    1. Faxin Li & Dawei Yin & Chun Zhu & Feng Wang & Ning Jiang & Zhen Zhang, 2021. "Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading," Energies, MDPI, vol. 14(12), pages 1-18, June.
    2. Junbiao Ma & Ning Jiang & Xujun Wang & Xiaodong Jia & Dehao Yao, 2021. "Numerical Study of the Strength and Characteristics of Sandstone Samples with Combined Double Hole and Double Fissure Defects," Sustainability, MDPI, vol. 13(13), pages 1-16, June.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Shouguo Yang & Ning Xu & Xiaofei Zhang, 2023. "Numerical Simulation Study on the Evolution Law of Stress and Crack in Coal Seam Hydraulic Fracturing," Sustainability, MDPI, vol. 15(14), pages 1-13, July.

    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. Chun Zhu & Xiaojie Yang & Zhigang Tao & Jianping Sun, 2022. "Challenges and Opportunities in Rock Mechanics and Engineering—An Overview," Energies, MDPI, vol. 15(3), pages 1-3, January.
    2. Xuming Zhou & Haotian Li & Xuelong Li & Jianwei Wang & Jingjing Meng & Mingze Li & Chengwei Mei, 2022. "Research on Gob-Side Entry Retaining Mining of Fully Mechanized Working Face in Steeply Inclined Coal Seam: A Case in Xinqiang Coal Mine," Sustainability, MDPI, vol. 14(16), pages 1-16, August.
    3. Ning Jiang & Ke Lv & Zhiyou Gao & Huixin Di & Junbiao Ma & Tianyi Pan, 2022. "Study on Characteristics of Overburden Strata Structure above Abandoned Gob of Shallow Seams—A Case Study," Energies, MDPI, vol. 15(24), pages 1-22, December.

    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:jsusta:v:14:y:2022:i:20:p:13555-:d:948050. 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.