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<p>Proper characterization of rock joints is crucial for the assessment of rock mass quality and stability of excavations in rock engineering applications. This study systematically analyzed joint data from the − 300&#xa0;m stope of the Shihewang Iron Mine to investigate the distribution characteristics of dominant joint sets, their probability density functions, and their correlations with geological tectonic movements. The findings indicate that as scanline length increased, fluctuations in mean trace length and joint density variability decreased, stabilizing when scanline lengths exceeded 30&#xa0;m, the rectangular window sizes exceeded 3&#xa0;m × 1.5&#xa0;m, and the scanning length exceeds 12 m. Joint trace length and density parameters were accurately determined through comprehensive calculations, and joint spacing grades for different rock mass sections were categorized. Dominant joint sets and their dip in the hanging wall, ore body, and footwall were identified, with results indicating that the direction of maximum principal stress (NEE) significantly promotes joint formation. The influence of rock blocks formed by joints on roadway excavation stability was assessed, showing the highest risk in the footwall blocks. From an economic, quick, accurate and efficient point of view, it is recommended to use the scanline method to obtain information on underground roadway joints. These results provide new theoretical insights and engineering guidelines for joint characterization and roadway stability assessment in complex mining environments.</p>

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Joint Characterization and Stability Analysis: Measurement Techniques and Engineering Implications

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Rui-yang Bi,
  • Chao-shui Xu,
  • Zu-pu Xuan,
  • Jian Zhou,
  • Kun Du

摘要

Proper characterization of rock joints is crucial for the assessment of rock mass quality and stability of excavations in rock engineering applications. This study systematically analyzed joint data from the − 300 m stope of the Shihewang Iron Mine to investigate the distribution characteristics of dominant joint sets, their probability density functions, and their correlations with geological tectonic movements. The findings indicate that as scanline length increased, fluctuations in mean trace length and joint density variability decreased, stabilizing when scanline lengths exceeded 30 m, the rectangular window sizes exceeded 3 m × 1.5 m, and the scanning length exceeds 12 m. Joint trace length and density parameters were accurately determined through comprehensive calculations, and joint spacing grades for different rock mass sections were categorized. Dominant joint sets and their dip in the hanging wall, ore body, and footwall were identified, with results indicating that the direction of maximum principal stress (NEE) significantly promotes joint formation. The influence of rock blocks formed by joints on roadway excavation stability was assessed, showing the highest risk in the footwall blocks. From an economic, quick, accurate and efficient point of view, it is recommended to use the scanline method to obtain information on underground roadway joints. These results provide new theoretical insights and engineering guidelines for joint characterization and roadway stability assessment in complex mining environments.