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<p>To investigate the influence of fracture geometry on the shear mechanical and seepage characteristics of rock masses, the shear stress-seepage tests under three-dimensional stress conditions are conducted on inclined single-fracture sandstone rock samples with different inclination angle and roughness. A comparative analysis was conducted on the morphological changes of the fracture surface before and after the experiments. The relationship between fracture geometry, mechanical and seepage characteristics has been studied. The research results demonstrate that: the axial stress and effective normal stress exhibited as a U-shaped trend with the increases of inclination angle; The strengthening effect of roughness on shear stress is inherently bounded by a critical threshold, this limitation is mechanistically governed by the shear resistance of asperities, which ceases to improve beyond optimal roughness levels (JRC≈7 in this study). At elevated roughness values (JRC &gt; 12), asperity degradation dominates over interlocking benefits, resulting in stabilized shear stress despite further roughness elevation; During the shear sliding process, the anisotropy of the fracture surface has a gradual reduction; The flow rate curve can be divided into two modes according to the contraction or dilation of fracture; Based on gray threshold segmentation methods, the concave regions and the convex regions have been identified and segmented. The mismatch degree <i>φ</i> between the upper and lower rock blocks has been defined and calculated. As the mismatch degree increases, the flow rate increases exponentially.</p>

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The Effects of Fracture Geometry on Mechanical Characteristics and Seepage Laws of Sandstone Fracture Under Triaxial Shear Tests

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Jinzhou Tang,
  • Ke Yang,
  • Guangming Zhao,
  • Jucai Chang,
  • Zhiqiang Yin,
  • Minke Duan,
  • Tuo Wang,
  • Jing Yang,
  • Bo Hu

摘要

To investigate the influence of fracture geometry on the shear mechanical and seepage characteristics of rock masses, the shear stress-seepage tests under three-dimensional stress conditions are conducted on inclined single-fracture sandstone rock samples with different inclination angle and roughness. A comparative analysis was conducted on the morphological changes of the fracture surface before and after the experiments. The relationship between fracture geometry, mechanical and seepage characteristics has been studied. The research results demonstrate that: the axial stress and effective normal stress exhibited as a U-shaped trend with the increases of inclination angle; The strengthening effect of roughness on shear stress is inherently bounded by a critical threshold, this limitation is mechanistically governed by the shear resistance of asperities, which ceases to improve beyond optimal roughness levels (JRC≈7 in this study). At elevated roughness values (JRC > 12), asperity degradation dominates over interlocking benefits, resulting in stabilized shear stress despite further roughness elevation; During the shear sliding process, the anisotropy of the fracture surface has a gradual reduction; The flow rate curve can be divided into two modes according to the contraction or dilation of fracture; Based on gray threshold segmentation methods, the concave regions and the convex regions have been identified and segmented. The mismatch degree φ between the upper and lower rock blocks has been defined and calculated. As the mismatch degree increases, the flow rate increases exponentially.