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<p>To enhance the accuracy of assessing the risk of floor water bursts in karst aquifers within the northern Guizhou coalfield, this study proposes a novel evaluation method that integrates fractal quantitative techniques with the vulnerability index approach. This study focuses on the karst aquifer underlying the No. 13 coal seam in the second mining area of Longfeng Coal Mine. Based on geological survey data, fractal theory is employed to quantitatively assess the degree of karst development. Additionally, we utilize ArcGIS coupled with the vulnerability index method to conduct a zonal risk assessment of floor water burst in the coal seam. The results indicate that the karst aquifer in the Maokou Formation at a depth of 0 to 10 m has the most significant impact on the risk of floor water burst in the No. 13 coal seam. The average fractal dimension of the karst development is 1.31, indicating a high degree of development. The karst development features exhibit a banded distribution pattern oriented northwest-southeast, with significant spatial variability. In the study area, the relative risk of floor water burst increases progressively from the interior to the exterior. The primary risk zones are concentrated in the southwestern region, a small portion of the northwestern area, and the northeastern and eastern regions, displaying both banded and elliptical distribution patterns. Comparative validation reveals that the vulnerability index method, which accounts for the degree of karst development, provides a more accurate predictive assessment, aligning closely with practical engineering considerations. This approach can offer valuable theoretical guidance for formulating water inrush management strategies in the mining area.</p>

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Risk Assessment of Water Inrush from Coal Seam Karst Floor in North Guizhou Coalfield Based on Fractal-Vulnerability Index Method

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Jin Xu,
  • Lulin Zheng,
  • Ruipeng Li,
  • Hong Lan,
  • Hongdong Xie,
  • Shiyu Tian,
  • Youwen Tian

摘要

To enhance the accuracy of assessing the risk of floor water bursts in karst aquifers within the northern Guizhou coalfield, this study proposes a novel evaluation method that integrates fractal quantitative techniques with the vulnerability index approach. This study focuses on the karst aquifer underlying the No. 13 coal seam in the second mining area of Longfeng Coal Mine. Based on geological survey data, fractal theory is employed to quantitatively assess the degree of karst development. Additionally, we utilize ArcGIS coupled with the vulnerability index method to conduct a zonal risk assessment of floor water burst in the coal seam. The results indicate that the karst aquifer in the Maokou Formation at a depth of 0 to 10 m has the most significant impact on the risk of floor water burst in the No. 13 coal seam. The average fractal dimension of the karst development is 1.31, indicating a high degree of development. The karst development features exhibit a banded distribution pattern oriented northwest-southeast, with significant spatial variability. In the study area, the relative risk of floor water burst increases progressively from the interior to the exterior. The primary risk zones are concentrated in the southwestern region, a small portion of the northwestern area, and the northeastern and eastern regions, displaying both banded and elliptical distribution patterns. Comparative validation reveals that the vulnerability index method, which accounts for the degree of karst development, provides a more accurate predictive assessment, aligning closely with practical engineering considerations. This approach can offer valuable theoretical guidance for formulating water inrush management strategies in the mining area.