最新刊期

      ZHANG Cun, CHEN Yanhong, REN Zhaopeng, REN Yiming, LIAN Yongqi, LI Xiaobin

      摘要：Under high-intensity coal mining disturbance， the overlying strata undergo movement and deformation， forming a complex network of mining-induced fractures. These fractures can easily penetrate loose aquifers and gradually extend to the surface， leading to ecological damage in mining areas and posing serious threats to safe production in the working face. Based on this， taking Shangwan Coal Mine as the research background， this study analyzes the spatiotemporal evolution characteristics of mining-induced fractures in overlying strata using methods such as physical simulation and fractal theory. Meanwhile， based on fractal image features， voids in overlying strata during the advance of the working face are identified， revealing the spatial distribution and evolution patterns of mining-induced void ratios in overlying strata. A design for coordinated grouting for damage reduction is proposed， targeting "near-field caved zone and far-field high-level separation voids" during mining， along with post-mining grouting for stabilizing residual voids to mitigate damage. Reasonable grouting spaces and timing parameters are provided. The results show that due to the synergistic guiding and controlling effects of thick hard rock layers and thick soft rock buffer layers， the height of separation spaces and the fractal dimension in overlying strata exhibit coordinated evolution characteristics. As the working face advances， the fractal dimension of overlying fractures shows a step-like fluctuating downward trend， while the void ratio decreases nonlinearly. After the working face reaches full and sufficient mining， the overlying fracture field presents an asymmetric void morphology， with a void ratio of 2.37%. The fracture network in overlying strata expands and evolves spatially， propagating from bottom to top and from surface to interior with mining-induced damage conduction. The distribution of fractal dimensions shows a regular fluctuating downward trend， and its expansion space develops from an arch shape to a trapezoidal depth. The research findings provide scientific reference for damage-reducing mining in similar mines in the Shendong mining area.  
      关键词：Coal mining;Overburden fracture;Fractal dimension;Porosity evolution;Damage mitigation grouting   
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      更新时间：2026-07-10
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