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A Study on the Permeability and Damage Characteristics of Limestone under Stress–Seepage Coupling Conditions

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  • Lu Wang

    (School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
    College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China)

  • Jianfeng Liu

    (College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China)

  • Yilin Liao

    (College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China)

  • Shuyu Yang

    (School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China)

  • An He

    (School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China)

  • Huining Xu

    (College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China)

Abstract

With the increase in energy demand, energy engineering has gradually developed to go deeper, accompanied by a complex geological environment, such as the coupling of stress and seepage. Limestone is widely found in underground rock engineering, and its stress–seepage coupling characteristics have a great influence on the safety and stability of related engineering projects. In order to study the permeability characteristics and damage evolution of limestone during the deformation and failure process under stress–seepage coupling conditions, permeability and acoustic emission tests on limestone were performed in this paper. The results showed that: the stress–strain curve demonstrated periodicity, as did the permeability change. The change in permeability in different deformation stages of axial strain and lateral strain was similar, but it was more appropriate to reflect the permeability evolution in terms of lateral strain. The permeability of the limestone slightly decreased in the volumetric compression stage, and tended to saturate after a sudden increase in the expansion stage. The presence of the confining pressure reduced the permeability of the rock. In the process of limestone deformation and failure, the level of acoustic emission activity can reflect the degree of fracture development. The permeability characteristics and acoustic emission characteristics had a good corresponding relationship. The greater the confining pressure, the higher the acoustic emission activity. The deformation and damage process of limestone experienced three stages: damage stable growth, damage acceleration development, and damage saturation.

Suggested Citation

  • Lu Wang & Jianfeng Liu & Yilin Liao & Shuyu Yang & An He & Huining Xu, 2023. "A Study on the Permeability and Damage Characteristics of Limestone under Stress–Seepage Coupling Conditions," Energies, MDPI, vol. 16(19), pages 1-15, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:19:p:6899-:d:1251449
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    References listed on IDEAS

    as
    1. Ersheng Zha & Ru Zhang & Zetian Zhang & Ting Ai & Li Ren & Zhaopeng Zhang & Yang Liu & Chendi Lou, 2020. "Acoustic Emission Characteristics and Damage Evolution of Rock under Different Loading Modes," Energies, MDPI, vol. 13(14), pages 1-17, July.
    2. Haibo Tang & Yangsheng Zhao & Zhiqin Kang & Zhaoxing Lv & Dong Yang & Kun Wang, 2022. "Investigation on the Fracture-Pore Evolution and Percolation Characteristics of Oil Shale under Different Temperatures," Energies, MDPI, vol. 15(10), pages 1-14, May.
    3. Qiangxing Zhang & Jianfeng Liu & Lu Wang & Min Luo & Hejuan Liu & Huining Xu & Hang Zou, 2020. "Impurity Effects on the Mechanical Properties and Permeability Characteristics of Salt Rock," Energies, MDPI, vol. 13(6), pages 1-19, March.
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