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<p>To reveal the mechanisms governing the temperature-dependent electrical behavior of coal-bearing surrounding rocks, a multi-physics coupling model was established and combined with experimental data to systematically analyze the evolution of resistivity and dielectric properties with temperature. The results show that resistivity undergoes a three-stage transformation: it first increases due to microcrack development and pore-water evaporation, then decreases sharply as carriers are thermally activated, and further declines at higher temperatures. Dielectric properties are markedly enhanced beyond a critical threshold, accompanied by a relaxation peak that indicates interfacial and ionic polarization dominate under thermal activation. A pronounced frequency dispersion is also observed, with polarization processes being suppressed at higher frequencies. These findings demonstrate that temperature strongly regulates carrier mobility and polarization capacity, thereby exerting a fundamental influence on the resistivity and dielectric response of rocks. This work provides theoretical support and practical reference for temperature correction in deep resource geophysical exploration, real-time monitoring of thermal damage in mines, and stability assessment of rocks under high-temperature conditions.</p>

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Theoretical and experimental study of thermo electrical coupling mechanisms in coal bearing rocks

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月1日

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  • Xiaokun Zhao,
  • Jun Ge,
  • An Zhang,
  • WenCai Wang,
  • Donghui Yang,
  • Yong Liu,
  • Weixia Fu

摘要

To reveal the mechanisms governing the temperature-dependent electrical behavior of coal-bearing surrounding rocks, a multi-physics coupling model was established and combined with experimental data to systematically analyze the evolution of resistivity and dielectric properties with temperature. The results show that resistivity undergoes a three-stage transformation: it first increases due to microcrack development and pore-water evaporation, then decreases sharply as carriers are thermally activated, and further declines at higher temperatures. Dielectric properties are markedly enhanced beyond a critical threshold, accompanied by a relaxation peak that indicates interfacial and ionic polarization dominate under thermal activation. A pronounced frequency dispersion is also observed, with polarization processes being suppressed at higher frequencies. These findings demonstrate that temperature strongly regulates carrier mobility and polarization capacity, thereby exerting a fundamental influence on the resistivity and dielectric response of rocks. This work provides theoretical support and practical reference for temperature correction in deep resource geophysical exploration, real-time monitoring of thermal damage in mines, and stability assessment of rocks under high-temperature conditions.