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<p>Slope stability in opencast mines is a critical concern for ensuring safe and sustainable mining operations, particularly in weak overburden conditions. This study presents a numerical investigation of the influence of bench geometry and geomechanical parameters on slope stability using the finite element-based Phase2D software. Field observations and laboratory testing were conducted to evaluate the performance of an existing slope configuration with a bench height of 10&#xa0;m and a slope angle of 70°. The results indicate that the current design is critically unstable, with a strength reduction factor of 0.58 and a maximum displacement of 0.19&#xa0;m. A systematic parametric sensitivity analysis was performed to quantify the impact of key variables, including bench height, slope angle, cohesion, friction angle, and material density. The findings reveal that bench geometry and cohesion are the most influential parameters governing slope stability, while friction angle and density exhibit comparatively lower effects. Based on the analysis, an optimized slope configuration with a 5&#xa0;m bench height and a 45° slope angle is proposed, resulting in a significantly improved strength reduction factor of 2.36. The study provides a practical and data-driven framework for slope design optimization in opencast mines, contributing to improved safety, operational efficiency, and sustainable infrastructure development in mining environments.</p>

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Optimizing slope stability in opencast mines using geometric and geomechanical parameters through a numerical modeling approach

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Sathish Kumar Mittapally,
  • Harish Kairamkonda,
  • Abhishek Kumar Tripathi,
  • Siva Avudaiappan,
  • Tarek Salem Abdennaji,
  • Yewuhalashet Fissha

摘要

Slope stability in opencast mines is a critical concern for ensuring safe and sustainable mining operations, particularly in weak overburden conditions. This study presents a numerical investigation of the influence of bench geometry and geomechanical parameters on slope stability using the finite element-based Phase2D software. Field observations and laboratory testing were conducted to evaluate the performance of an existing slope configuration with a bench height of 10 m and a slope angle of 70°. The results indicate that the current design is critically unstable, with a strength reduction factor of 0.58 and a maximum displacement of 0.19 m. A systematic parametric sensitivity analysis was performed to quantify the impact of key variables, including bench height, slope angle, cohesion, friction angle, and material density. The findings reveal that bench geometry and cohesion are the most influential parameters governing slope stability, while friction angle and density exhibit comparatively lower effects. Based on the analysis, an optimized slope configuration with a 5 m bench height and a 45° slope angle is proposed, resulting in a significantly improved strength reduction factor of 2.36. The study provides a practical and data-driven framework for slope design optimization in opencast mines, contributing to improved safety, operational efficiency, and sustainable infrastructure development in mining environments.