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Volume 47 Issue 2
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SHEN Linfang, LÜ Qianwen, LIU Wenlian, ZHANG Jiaming, YANG Hongzhong, LI Ze. Numerical study on permeability properties of three-dimensional rock fracture under coupled stress-seepage-dissolution process[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(2): 428-437. DOI: 10.11779/CJGE20231061
Citation: SHEN Linfang, LÜ Qianwen, LIU Wenlian, ZHANG Jiaming, YANG Hongzhong, LI Ze. Numerical study on permeability properties of three-dimensional rock fracture under coupled stress-seepage-dissolution process[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(2): 428-437. DOI: 10.11779/CJGE20231061
shu

Numerical study on permeability properties of three-dimensional rock fracture under coupled stress-seepage-dissolution process

  • 1.

    Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China

  • 2.

    Kunming Prospecting Design Institute of China Nonferrous Metals Industry, Kunming 650051, China

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  • Received Date: November 29, 2023
  • Available Online: April 17, 2024
    Graphical Abstract
    • Abstract
  • Based on the lattice Boltzmann method, the evolution of seepage velocity field and solute concentration field is simulated by the double-distribution functions, and a numerical model is proposed to study the coupling mechanism of stress-seepage-dissolution in three-dimensional rock fracture. The evolution of fracture permeability properties is discussed considering the effects of seepage velocity, normal stress and dissolution rate. The results show that when the seepage velocity is low, the ions dissolved from the fracture wall cannot be transported in time, which results in a higher concentration and a lower dissolution rate at the outlet, the dissolved fracture is shaped as a "bell mouth". Increasing the normal stress decreases the fracture width and slows down the solute transport rate, which significantly reduces the dissolution at the fracture outlet, limiting the development of its permeability. When the wall dissolution rate is low, the fracture permeability shows a continuous and slow growth. As the dissolution rate increases, the dissolution amount at the outlet is significantly less than that at the inlet, which leads to a slow development of fracture permeability until the wall surface at the outlet exhibits significant dissolution, and the fracture permeability shows a rapid growth trend. The results can provide important theoretical support for the quantitative evaluation of permeability of rock fracture under acid corrosion.
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    • References (24)
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