Scholarlink

<p>High ground stress and fractured rock have led to severe plastic zone expansion, complicating support design. This study combined theoretical derivation, numerical simulation, physical analog model tests, and field monitoring to assess how support methods and geological conditions affect the plastic zone. Theoretical formulas for the plastic zone radius of roadways supported by bolt-mesh-shotcrete (BMS) and BMS with concrete-filled steel tubes (BMS-CFST) were developed. The plastic zone volume gradient field was obtained via numerical simulation and a multivariate coupling analysis. Physical analog model tests verified that the plastic zone expansion pattern and support method are the primary controlling factors, revealing the surrounding rock instability mechanism. Finally, the BMS-CFST support technology was applied in underground practice. Results demonstrated a strong correlation (R<sup>2</sup>= 0.99) between the theoretically derived plastic zone radius and numerical simulation outcomes. Compared to other roadways, the plastic zone radius in BMS-CFST-supported roadways was reduced by 58.8% and 57.2%, respectively. The Mohr’s circle progression from physical analog model tests revealed a progressive “surface-to-depth” failure mechanism, indicating that surface rock units gradually destabilize and progress inward. On-site monitoring indicates a 1.72% cross-sectional convergence rate for the BMS-CFST-supported roadway, demonstrating its effectiveness in controlling plastic zone expansion.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Distribution Characteristics and Control Strategies for Plastic Zones Around Coal Mining Roadways Under Various Support Methods and Geological Conditions

  • 期刊论文

  • 发表日期：

    2025年12月22日

查看全文
  • Xiangsong Kong,
  • Zhengyou Qin,
  • Yuhang Xiao,
  • Renliang Shan,
  • Hongxin Zhu,
  • Yifan Dai

摘要

High ground stress and fractured rock have led to severe plastic zone expansion, complicating support design. This study combined theoretical derivation, numerical simulation, physical analog model tests, and field monitoring to assess how support methods and geological conditions affect the plastic zone. Theoretical formulas for the plastic zone radius of roadways supported by bolt-mesh-shotcrete (BMS) and BMS with concrete-filled steel tubes (BMS-CFST) were developed. The plastic zone volume gradient field was obtained via numerical simulation and a multivariate coupling analysis. Physical analog model tests verified that the plastic zone expansion pattern and support method are the primary controlling factors, revealing the surrounding rock instability mechanism. Finally, the BMS-CFST support technology was applied in underground practice. Results demonstrated a strong correlation (R2= 0.99) between the theoretically derived plastic zone radius and numerical simulation outcomes. Compared to other roadways, the plastic zone radius in BMS-CFST-supported roadways was reduced by 58.8% and 57.2%, respectively. The Mohr’s circle progression from physical analog model tests revealed a progressive “surface-to-depth” failure mechanism, indicating that surface rock units gradually destabilize and progress inward. On-site monitoring indicates a 1.72% cross-sectional convergence rate for the BMS-CFST-supported roadway, demonstrating its effectiveness in controlling plastic zone expansion.