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<p>This study investigates the mechanical and energy characteristics of double-fractured rock masses under impact loading, with a focus on the influence of fracture angles on strain, stress, and energy accumulation in sandstone specimens under dynamic loading conditions. Experiments were conducted using a Split Hopkinson Pressure Bar (SHPB) to analyze the mechanical and energy behaviors of rocks with different fracture angles. The results indicate that fracture angles significantly affect strain distribution, with yellow sandstone exhibiting a broader strain distribution, while gray sandstone shows more concentrated peak strain. Both peak strain and stress initially decrease and then increase as the fracture angle increases. Yellow sandstone demonstrates higher peak strain but lower peak stress, and its degree of fragmentation increases with larger fracture angles. A fracture angle of 45° exhibits the highest energy accumulation efficiency, suggesting superior energy storage potential. Higher energy-time density (<i>E</i><sub>VT</sub>) values are associated with greater energy absorption, promoting crack propagation and increasing the risk of rock fracture. Fractal dimension analysis reveals a W-shaped relationship between fracture angles and fractal dimensions, with yellow sandstone having higher fractal dimensions, indicating more complex fracture patterns. The findings provide new insights into the influence of fracture geometry on energy storage and rock fracture, offering significant implications for mining stability and resource utilization efficiency.</p>

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Dynamic Behavior of Double-Flawed Sandstone Under SHPB: A Case Study from Gongchangling Iron Mine

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Chenglong Ma,
  • Zhiguo Xia,
  • Quansen Wu,
  • Dawei Yin,
  • Quanlin Wu,
  • Zhaoyu Li

摘要

This study investigates the mechanical and energy characteristics of double-fractured rock masses under impact loading, with a focus on the influence of fracture angles on strain, stress, and energy accumulation in sandstone specimens under dynamic loading conditions. Experiments were conducted using a Split Hopkinson Pressure Bar (SHPB) to analyze the mechanical and energy behaviors of rocks with different fracture angles. The results indicate that fracture angles significantly affect strain distribution, with yellow sandstone exhibiting a broader strain distribution, while gray sandstone shows more concentrated peak strain. Both peak strain and stress initially decrease and then increase as the fracture angle increases. Yellow sandstone demonstrates higher peak strain but lower peak stress, and its degree of fragmentation increases with larger fracture angles. A fracture angle of 45° exhibits the highest energy accumulation efficiency, suggesting superior energy storage potential. Higher energy-time density (EVT) values are associated with greater energy absorption, promoting crack propagation and increasing the risk of rock fracture. Fractal dimension analysis reveals a W-shaped relationship between fracture angles and fractal dimensions, with yellow sandstone having higher fractal dimensions, indicating more complex fracture patterns. The findings provide new insights into the influence of fracture geometry on energy storage and rock fracture, offering significant implications for mining stability and resource utilization efficiency.