IDEAS home Printed from https://ideas.repec.org/a/gam/jeners/v14y2021i23p8124-d694718.html
   My bibliography  Save this article

Investigation of the Energy Evolution of Tectonic Coal under Triaxial Cyclic Loading with Different Loading Rates and the Underlying Mechanism

Author

Listed:
  • Deyi Gao

    (Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology, Xuzhou 221008, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221008, China
    These authors contributed equally to this work.)

  • Shuxun Sang

    (School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221008, China
    Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, China
    Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou 221008, China
    These authors contributed equally to this work.)

  • Shiqi Liu

    (Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, China
    Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, China University of Mining and Technology, Xuzhou 221008, China
    These authors contributed equally to this work.)

  • Jishi Geng

    (Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology, Xuzhou 221008, China)

  • Tao Wang

    (Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology, Xuzhou 221008, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221008, China)

  • Tengmin Sun

    (Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology, Xuzhou 221008, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221008, China)

Abstract

It is of great significance to ascertain the mechanical characteristics and deformation laws of tectonic coal that is under complex stress conditions for safe production, but the targeted research in this area is still insufficient at present. This paper performed triaxial tests under cyclic multi-level loading at different rates by using an MTS-815 Rock Mechanics Testing System. The strain characteristics, elastic modulus and energy evolution were obtained in order to explore the effects of the mechanism of loading rate on the evolution of deformation and energy parameters of tectonic coal. The results showed that the irreversible strain and plastic energy increased exponentially with the increase in the deviatoric stress, but the growth rate decreased with the increase in loading rate. Furthermore, the elastic strain increased linearly and the growth rate was essentially unaffected by the loading rate. During the compaction stage, the variation of each parameter was not sensitive to the loading rate; during the elastic and damage stage, the rate increase inhibited secondary defect propagation and improved rock strength. In addition, the stepwise and cumulative energy ratio was defined in order to describe the energy distribution during cyclic loading and unloading. It was found that the decrease in the loading rate was beneficial to the transformation of the total energy into plastic energy. The elastic modulus was the most sensitive to sample damage, but the energy density evolution was able to be used to describe the deformation damage process of tectonic coal in more detail. These findings provide important theoretical support for the tectonic coal deformation law and action mechanism in the damage process that occurs under complex stress conditions.

Suggested Citation

  • Deyi Gao & Shuxun Sang & Shiqi Liu & Jishi Geng & Tao Wang & Tengmin Sun, 2021. "Investigation of the Energy Evolution of Tectonic Coal under Triaxial Cyclic Loading with Different Loading Rates and the Underlying Mechanism," Energies, MDPI, vol. 14(23), pages 1-19, December.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:23:p:8124-:d:694718
    as

    Download full text from publisher

    File URL: https://www.mdpi.com/1996-1073/14/23/8124/pdf
    Download Restriction: no

    File URL: https://www.mdpi.com/1996-1073/14/23/8124/
    Download Restriction: no
    ---><---

    Citations

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


    Cited by:

    1. Chun Zhu & Jiabing Zhang & Junlong Shang & Dazhong Ren & Manchao He, 2023. "Advances in Multifield and Multiscale Coupling of Rock Engineering," Energies, MDPI, vol. 16(10), pages 1-6, May.
    2. Xinwei Li & Zhishu Yao & Xiaohu Liu & Xianwen Huang, 2022. "Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles," Energies, MDPI, vol. 15(4), pages 1-16, 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:14:y:2021:i:23:p:8124-:d:694718. 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: 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.