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<p>Water resources in China's western eco-environment are scarce and longwall mining can damage these shallow water resources through leakage. To achieve efficient coal mining and protect the water resources, grouting reinforcement of the aquitard layer was proposed for the Xiao Haotu Coal Mine. This paper analyzed the characteristics of the aquifer and aquitard, and the thickness distribution of double aquifers and double aquitards was divided into mine areas. The height of the water-conducting fracture zones at different mining heights was studied using theoretical analysis and the universal distinct element code (UDEC) numerical simulation. The simulation results indicate that the development height of the water-conducting fracture zone (WCFZ) in the Xiao Haotu Coal Mine exhibits a linear relationship proportional to 28 times the mining height. The water-conducting fracture zone developed into the Anding Formation water-resisting layer, and the height reached 60&#xa0;m. Grouting reinforcement of the aquitard with surface horizontal directional branch drilling and surface radial jet drilling technology was proposed, and the drilling layout parameter scheme was designed. Combined with the research content and geological conditions, a physical model of grouting reinforcement of an aquitard in the mine was established. The effectiveness of the grouting reinforcement of the aquitard was validated. Further analysis of the effectiveness of the grouted aquitard layer was conducted using specialized prediction software for rock movement. The results can guide coal mining in the study area and protect local water resources.</p>

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Failure of Weakly Cemented Overlying Strata During Mining and Evaluating the Feasibility of Grouting Reinforcement for Water Conservation

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Qiang Sun,
  • Xiaoming Cheng,
  • Hongzhen Nie,
  • Rui Zhao

摘要

Water resources in China's western eco-environment are scarce and longwall mining can damage these shallow water resources through leakage. To achieve efficient coal mining and protect the water resources, grouting reinforcement of the aquitard layer was proposed for the Xiao Haotu Coal Mine. This paper analyzed the characteristics of the aquifer and aquitard, and the thickness distribution of double aquifers and double aquitards was divided into mine areas. The height of the water-conducting fracture zones at different mining heights was studied using theoretical analysis and the universal distinct element code (UDEC) numerical simulation. The simulation results indicate that the development height of the water-conducting fracture zone (WCFZ) in the Xiao Haotu Coal Mine exhibits a linear relationship proportional to 28 times the mining height. The water-conducting fracture zone developed into the Anding Formation water-resisting layer, and the height reached 60 m. Grouting reinforcement of the aquitard with surface horizontal directional branch drilling and surface radial jet drilling technology was proposed, and the drilling layout parameter scheme was designed. Combined with the research content and geological conditions, a physical model of grouting reinforcement of an aquitard in the mine was established. The effectiveness of the grouting reinforcement of the aquitard was validated. Further analysis of the effectiveness of the grouted aquitard layer was conducted using specialized prediction software for rock movement. The results can guide coal mining in the study area and protect local water resources.