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<p>Accurate determination of the water-conducting fractured zone (WCFZ) height is critical for preventing roof water inrush in coal mines. Taking the 82,209 near-horizontal fully mechanized caving face of the No. 22 coal seam in Lijiayao Coal Mine as the research object, we established a multi-method synergistic system combining empirical formula calculation, key strata theory prediction, surface borehole field measurement and numerical simulation. Empirical formulas produce highly scattered results (32.94–135.00&#xa0;m) and are only suitable for preliminary estimation. Key strata prediction and numerical simulation agree well with field measurements, with relative errors of 0.69%–4.15% and 1.36%–4.56%, respectively. The final WCFZ height is 64.52&#xa0;m at Borehole 1 and 113.58&#xa0;m at Borehole 2. Numerical simulation reveals a three-stage evolution law: initial development, rapid expansion and stable development. The multi-method system achieves accurate WCFZ determination and provides a valuable reference for water disaster prevention in similar mining conditions.</p>

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Multi-method synergistic determination of the development height of the water-conducting fractured zone in the 82,209 working face

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月6日

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  • Zenghui Liu,
  • Haonan Li

摘要

Accurate determination of the water-conducting fractured zone (WCFZ) height is critical for preventing roof water inrush in coal mines. Taking the 82,209 near-horizontal fully mechanized caving face of the No. 22 coal seam in Lijiayao Coal Mine as the research object, we established a multi-method synergistic system combining empirical formula calculation, key strata theory prediction, surface borehole field measurement and numerical simulation. Empirical formulas produce highly scattered results (32.94–135.00 m) and are only suitable for preliminary estimation. Key strata prediction and numerical simulation agree well with field measurements, with relative errors of 0.69%–4.15% and 1.36%–4.56%, respectively. The final WCFZ height is 64.52 m at Borehole 1 and 113.58 m at Borehole 2. Numerical simulation reveals a three-stage evolution law: initial development, rapid expansion and stable development. The multi-method system achieves accurate WCFZ determination and provides a valuable reference for water disaster prevention in similar mining conditions.