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<p>This paper proposes a new method for the physical modeling of the microcrack slippage mechanism on percolation behavior in rock samples under cyclic confining pressure. The physical models are produced using 3D printing and are two-part cylinders consisting of two halves. One half of the cylinder has a rectangular capillary on the adjacent surface. The other half is smooth and lacks a capillary. This two-part physical model concept allows for the evaluation of deformation non-uniformity in cylindrical samples under radial-axial compression. Comparative studies have shown that the hydraulic conductivity dynamics of the developed physical models show qualitatively similar trends to those of real porous and artificially fractured rocks. The hydraulic conductivity dynamics of the physical models includes patterns characteristic of both porous and artificially fractured samples. It has been experimentally demonstrated that the observed nonlinearity and hysteresis are consistent with frictional slip along a controlled interface and the associated geometric evolution of the capillary. Comparative studies have shown that in solid cylindrical physical models without fracturing, the dependence of hydraulic conductivity on pressure is linear. It has been established that, under cyclic radial-axial compression, nonuniform strain accumulation is observed in two-piece cylindrical specimens. The obtained results contribute to the understanding of the mechanisms of stress sensitivity of rock permeability and highlight the importance of considering microcrack/interface effects and principal stress orientation when interpreting laboratory stress-sensitivity measurements in rocks.</p>

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Physical Modeling of Stress-Dependent Rock Permeability: The Role of Microcrack Slippage and Deformation Heterogeneity

  • 期刊论文

  • 发表日期：

    2026年3月22日

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  • Evgenii Kozhevnikov,
  • Mikhail Turbakov,
  • Zakhar Ivanov,
  • Evgenii Riabokon,
  • Mikhail Guzev,
  • Evgenii Gladkikh,
  • Seyyed Shahab Tabatabee Moradi,
  • Dan Ma,
  • Liyuan Yu,
  • Jiangyu Wu

摘要

This paper proposes a new method for the physical modeling of the microcrack slippage mechanism on percolation behavior in rock samples under cyclic confining pressure. The physical models are produced using 3D printing and are two-part cylinders consisting of two halves. One half of the cylinder has a rectangular capillary on the adjacent surface. The other half is smooth and lacks a capillary. This two-part physical model concept allows for the evaluation of deformation non-uniformity in cylindrical samples under radial-axial compression. Comparative studies have shown that the hydraulic conductivity dynamics of the developed physical models show qualitatively similar trends to those of real porous and artificially fractured rocks. The hydraulic conductivity dynamics of the physical models includes patterns characteristic of both porous and artificially fractured samples. It has been experimentally demonstrated that the observed nonlinearity and hysteresis are consistent with frictional slip along a controlled interface and the associated geometric evolution of the capillary. Comparative studies have shown that in solid cylindrical physical models without fracturing, the dependence of hydraulic conductivity on pressure is linear. It has been established that, under cyclic radial-axial compression, nonuniform strain accumulation is observed in two-piece cylindrical specimens. The obtained results contribute to the understanding of the mechanisms of stress sensitivity of rock permeability and highlight the importance of considering microcrack/interface effects and principal stress orientation when interpreting laboratory stress-sensitivity measurements in rocks.