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<p>To evaluate the risk of water–sand inrush under thick loose layer with a thin bedrock, considering the large thickness, great burial depth, and high water level of the Neogene loose layer in the Wanfu mining area, as well as the comprehensive influence of coupled geostress, tectonic stress, and mining-induced dynamic pressure, 25 key influencing factors were identified from four aspects: loose layer characteristics, bedrock structure, mining conditions, and tectonic properties. A risk assessment index system for roof water–sand inrush under these conditions was established. Based on information entropy theory and the uncertainty measurement theory, a risk determination model for water–sand inrush was established. The risk of water–sand inrush was then evaluated for 57 boreholes in the planned mining areas of the Wanfu coal mine. The results showed that the risk level of borehole WB3-1 is grade 3 (relatively dangerous), 21 boreholes including W-13 are grade 2 (relatively safe), and 35 boreholes including W-8 are grade 1 (safe). This provides a reliable theoretical basis for the safe and efficient mining of coal under the thick loose layer of the Neogene in the deep wells of the Wanfu coal mine.</p>

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Risk Assessment of Water–Sand Inrush in Thin Bedrock Under Tectonic-Affected Thick Unconsolidated Strata

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Cong Yin,
  • Jiming Zhu,
  • Zhongchang Wang

摘要

To evaluate the risk of water–sand inrush under thick loose layer with a thin bedrock, considering the large thickness, great burial depth, and high water level of the Neogene loose layer in the Wanfu mining area, as well as the comprehensive influence of coupled geostress, tectonic stress, and mining-induced dynamic pressure, 25 key influencing factors were identified from four aspects: loose layer characteristics, bedrock structure, mining conditions, and tectonic properties. A risk assessment index system for roof water–sand inrush under these conditions was established. Based on information entropy theory and the uncertainty measurement theory, a risk determination model for water–sand inrush was established. The risk of water–sand inrush was then evaluated for 57 boreholes in the planned mining areas of the Wanfu coal mine. The results showed that the risk level of borehole WB3-1 is grade 3 (relatively dangerous), 21 boreholes including W-13 are grade 2 (relatively safe), and 35 boreholes including W-8 are grade 1 (safe). This provides a reliable theoretical basis for the safe and efficient mining of coal under the thick loose layer of the Neogene in the deep wells of the Wanfu coal mine.