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<p>This study proposed a non-invasive electrical resistivity method to track the fracture remediation process driven by microbially induced calcium carbonate precipitation. A seven-cycle grouting experiment was conducted on a rough-walled single fracture with an average aperture of 1.02&#xa0;mm. Resistivity was measured with a four-electrode method, and water pressure and precipitate thickness provided independent validation. The results indicated a non-uniform resistivity distribution across the fracture, with the resistivity increment decreasing from 26.6 Ω·m to 2.4 Ω·m along the flow path. The calcium carbonate precipitation and water pressure also exhibited an analogous spatial distribution pattern. The overall negative relationship between the electrical resistivity and the fracture aperture was well fitted by the power-law function with an R² value greater than 0.99. Incorporating pressure data into the established resistivity-aperture empirical relation yielded a reduction in absolute aperture estimation error, decreasing it from 0.103&#xa0;mm to 0.075&#xa0;mm. This study provided a promising non-invasive approach for real-time monitoring of the fracture remediation process, with potential applications in evaluating sealing efficiency in deep underground engineering.</p>

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Quantitative Evaluation of the Remediation Process in Engineering Rock Fractures Using Electrical-resistivity Method

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Yaping Deng,
  • Yu Tian,
  • Jiazhong Qian,
  • Chengyuan Zong,
  • Haichun Ma,
  • Lei Ma,
  • Yang Xu

摘要

This study proposed a non-invasive electrical resistivity method to track the fracture remediation process driven by microbially induced calcium carbonate precipitation. A seven-cycle grouting experiment was conducted on a rough-walled single fracture with an average aperture of 1.02 mm. Resistivity was measured with a four-electrode method, and water pressure and precipitate thickness provided independent validation. The results indicated a non-uniform resistivity distribution across the fracture, with the resistivity increment decreasing from 26.6 Ω·m to 2.4 Ω·m along the flow path. The calcium carbonate precipitation and water pressure also exhibited an analogous spatial distribution pattern. The overall negative relationship between the electrical resistivity and the fracture aperture was well fitted by the power-law function with an R² value greater than 0.99. Incorporating pressure data into the established resistivity-aperture empirical relation yielded a reduction in absolute aperture estimation error, decreasing it from 0.103 mm to 0.075 mm. This study provided a promising non-invasive approach for real-time monitoring of the fracture remediation process, with potential applications in evaluating sealing efficiency in deep underground engineering.