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<p>To address the critical scientific gap in quantifying fracture-dominated seepage mechanisms under reservoir dynamic loading, this study proposes an integrated methodology combining in situ double-ring infiltration experiments (<i>n</i> = 68), particle gradation analysis, and a novel fracture-porosity dual-domain model to assess groundwater recharge and reservoir leakage risks during coal mining beneath the Hongyanhe Reservoir. Key findings reveal: The vadose zone lithology (loess/weathered sandstone/silty clay) exhibits extremely low permeability (K = 6.52 × 10⁻⁷–3.47 × 10⁻⁸ cm/s), providing effective anti-seepage barriers; saturation-driven flow is gravity-dominated, with infiltration rates of 0.000029–0.000563&#xa0;m/d across lithologies; Reservoir seepage loss at the 4105 working face is 5.9 ± 0.7&#xa0;m³/d (95% CI), which is lower than conventional model predictions and poses no risk to mine safety; Field observations suggest that fracture density and silt layer thickness are primary controls of seepage variability. This work establishes the first physics-based framework for safe coal extraction under reservoirs, releasing 2.1&#xa0;million tons of otherwise stranded resources while ensuring reservoir integrity. Results provide a decision-making benchmark for global mining under water bodies.</p>

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Characteristic of the infiltration recharge effect in coal mine under reservoirs

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月3日

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  • Tianwen Long,
  • Kang Guo,
  • Rong Shang,
  • Qi Wang

摘要

To address the critical scientific gap in quantifying fracture-dominated seepage mechanisms under reservoir dynamic loading, this study proposes an integrated methodology combining in situ double-ring infiltration experiments (n = 68), particle gradation analysis, and a novel fracture-porosity dual-domain model to assess groundwater recharge and reservoir leakage risks during coal mining beneath the Hongyanhe Reservoir. Key findings reveal: The vadose zone lithology (loess/weathered sandstone/silty clay) exhibits extremely low permeability (K = 6.52 × 10⁻⁷–3.47 × 10⁻⁸ cm/s), providing effective anti-seepage barriers; saturation-driven flow is gravity-dominated, with infiltration rates of 0.000029–0.000563 m/d across lithologies; Reservoir seepage loss at the 4105 working face is 5.9 ± 0.7 m³/d (95% CI), which is lower than conventional model predictions and poses no risk to mine safety; Field observations suggest that fracture density and silt layer thickness are primary controls of seepage variability. This work establishes the first physics-based framework for safe coal extraction under reservoirs, releasing 2.1 million tons of otherwise stranded resources while ensuring reservoir integrity. Results provide a decision-making benchmark for global mining under water bodies.