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<p>Reactive transport in rough rock fractures is subject to continuous alteration in flow and mass transfer characteristics. A reactive transport model was developed to account for aperture variations induced by chemical reactions, with the flow field dynamically updated using the Navier–Stokes (NS) equations. The evolution characteristics of fracture aperture, solute concentration, and flow field were studied under different Péclet (Pe) and Damköhler (Da) number conditions. In addition, the effects of the joint roughness coefficient (JRC) and initial aperture on the reaction process were also analyzed. The results indicate that transport is dominated by advection and diffusion at low Da numbers, and fracture aperture changes are uniform. At high Da numbers, chemical reactions dominate, and fracture aperture changes become extremely nonuniform. The extent of the reaction increased with the initial aperture, and the post-reaction JRC of the fracture is related to the initial JRC. In the simulation of a precipitation reaction, the JRC decreased to 42.3, 60.1, and 64.1% of the initial values for typical Pe and low Da conditions, 86.7, 90.7, and 92.9% for typical Pe and typical Da conditions and 72.1, 80.7, and 83.4% for high Pe and typical Da conditions. In the simulation of a dissolution reaction, the JRC increased to 181.9, 156.5, and 153.8% of the initial value for typical Pe and low Da conditions, 126.0, 113.6, and 114.0% for typical Pe and typical Da conditions, 131.0, 121.5, and 120.7% for high Pe and typical Da conditions.</p>

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Reactive transport characteristics during precipitation and dissolution processes in rough rock fractures

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Liping Qiao,
  • Mengzi Ren,
  • Guangyuan Ma,
  • Zhechao Wang,
  • Bingyin Li

摘要

Reactive transport in rough rock fractures is subject to continuous alteration in flow and mass transfer characteristics. A reactive transport model was developed to account for aperture variations induced by chemical reactions, with the flow field dynamically updated using the Navier–Stokes (NS) equations. The evolution characteristics of fracture aperture, solute concentration, and flow field were studied under different Péclet (Pe) and Damköhler (Da) number conditions. In addition, the effects of the joint roughness coefficient (JRC) and initial aperture on the reaction process were also analyzed. The results indicate that transport is dominated by advection and diffusion at low Da numbers, and fracture aperture changes are uniform. At high Da numbers, chemical reactions dominate, and fracture aperture changes become extremely nonuniform. The extent of the reaction increased with the initial aperture, and the post-reaction JRC of the fracture is related to the initial JRC. In the simulation of a precipitation reaction, the JRC decreased to 42.3, 60.1, and 64.1% of the initial values for typical Pe and low Da conditions, 86.7, 90.7, and 92.9% for typical Pe and typical Da conditions and 72.1, 80.7, and 83.4% for high Pe and typical Da conditions. In the simulation of a dissolution reaction, the JRC increased to 181.9, 156.5, and 153.8% of the initial value for typical Pe and low Da conditions, 126.0, 113.6, and 114.0% for typical Pe and typical Da conditions, 131.0, 121.5, and 120.7% for high Pe and typical Da conditions.