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<p>This study proposes a novel approach to evaluate mining-induced deformation of clay-bearing rock slopes based on field measurements and 3-dimensional (3-D) numerical simulation. A rock slope in a Japanese limestone quarry, with a height of about 250&#xa0;m and intersected by a 70-m-thick layer of clay-bearing rock at its foot wall, was selected as the target of this study. This slope has experienced failures four times since 1996. The characteristics of the rock slope displacement field due to excavation were first characterized through the measurement of surface displacement at multiple points using an automated polar system. Based on the measured surface displacement data and 3-D finite element method (FEM), considering the detailed surface geometry of the quarry, a back analysis of mining-induced deformation was carried out to evaluate the regional stress state of the quarry and Young’s modulus of the rock mass using 3-D elastic analysis. The principal directions of the estimated regional stress were found to agree with those evaluated from in-situ stress measurements within the region, indicating that the regional stress state in the quarry estimated by the back analysis is highly reliable. Using the estimated regional stress, a 3-D elasto-plastic FEM analysis incorporating the plastic behavior of the clay-bearing rock was then performed. The modeling methods successfully captured the field measurement data. Therefore, the proposed approach can provide more reliable information for the evaluation of mining-induced deformation of clay-bearing rock slopes and their stability assessment.</p>

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3-D Numerical Analysis of Mining-Induced Deformation of Clay-Bearing Rock Slope in a Quarry

  • 期刊论文

  • 发表日期：

    2025年3月6日

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  • Clement Amagu Amagu,
  • Cheng Zhang,
  • Jun-ichi Kodama,
  • Daisuke Fukuda,
  • Atsushi Sainoki,
  • Ken Sugimoto,
  • Hikaru Shimada,
  • Nevaid Dzimunya,
  • Pardon Sinkala

摘要

This study proposes a novel approach to evaluate mining-induced deformation of clay-bearing rock slopes based on field measurements and 3-dimensional (3-D) numerical simulation. A rock slope in a Japanese limestone quarry, with a height of about 250 m and intersected by a 70-m-thick layer of clay-bearing rock at its foot wall, was selected as the target of this study. This slope has experienced failures four times since 1996. The characteristics of the rock slope displacement field due to excavation were first characterized through the measurement of surface displacement at multiple points using an automated polar system. Based on the measured surface displacement data and 3-D finite element method (FEM), considering the detailed surface geometry of the quarry, a back analysis of mining-induced deformation was carried out to evaluate the regional stress state of the quarry and Young’s modulus of the rock mass using 3-D elastic analysis. The principal directions of the estimated regional stress were found to agree with those evaluated from in-situ stress measurements within the region, indicating that the regional stress state in the quarry estimated by the back analysis is highly reliable. Using the estimated regional stress, a 3-D elasto-plastic FEM analysis incorporating the plastic behavior of the clay-bearing rock was then performed. The modeling methods successfully captured the field measurement data. Therefore, the proposed approach can provide more reliable information for the evaluation of mining-induced deformation of clay-bearing rock slopes and their stability assessment.