Scholarlink

<p>This study employs a novel five-factor orthogonal design—considering burial depth <i>H</i>, layer thickness <i>h</i>, lateral pressure coefficient <i>λ</i>, angle between structural plane strike and tunnel axis <i>α</i>, and dip angle <i>β</i>—combined with Midas GTS finite element analysis validated through 1:100 indoor model tests to investigate stability in deep-buried inclined layered rock mass tunnels. The results demonstrate a significant “angle effect” whereby the distribution and orientation of deformation and stress–strain in layered surrounding rock vary angularly, particularly under the coupled influence of <i>α</i> and <i>β</i>. Tunnel stability shows positive correlation with burial depth <i>H</i> and negative correlation with layer thickness <i>h</i>, though the beneficial effect of <i>h</i> can be diminished or reversed under unfavorable <i>α</i>–<i>β</i>–<i>λ</i> combinations. The influence of the lateral pressure coefficient <i>λ</i> on surrounding rock deformation exhibits highly nonlinear behavior and is modulated by <i>α</i> and <i>β</i>. Three high-risk failure modes are identified: (1) bedding slip shear failure (<i>α</i> → 0°, <i>β</i>&#xa0;≈&#xa0;45°) with extreme vault settlement; (2) bending-shear failure (<i>H</i> ≥ 300&#xa0;m, <i>λ</i> ≤ 0.8, <i>β</i> ≥ 60°) featuring high localized shear strain; and (3) shear-buckling failure (<i>λ</i> ≥ 1.5, <i>h</i> ≤ 0.5&#xa0;m, <i>β</i> ≤ 10°) where both settlement and shear strain peak. Corresponding support strategies are proposed, including pre-stressed anchors perpendicular to bedding, long cables with heavy steel arches, and closed-ring support systems with yielding elements. These findings provide practical guidance and a theoretical foundation for designing tunnel stability measures in complex geological environments.</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

Stability Analysis of Deep-Buried Railway Tunnels in Inclined Layered Rock Mass

  • 期刊论文

  • 发表日期：

    2025年10月6日

查看全文
  • Jing Li,
  • Qingguo Liang,
  • Chuntan Fan,
  • Weiyu Sun,
  • Shicai Li,
  • Fei Gao,
  • Yun Han,
  • Yuzhe Wu

摘要

This study employs a novel five-factor orthogonal design—considering burial depth H, layer thickness h, lateral pressure coefficient λ, angle between structural plane strike and tunnel axis α, and dip angle β—combined with Midas GTS finite element analysis validated through 1:100 indoor model tests to investigate stability in deep-buried inclined layered rock mass tunnels. The results demonstrate a significant “angle effect” whereby the distribution and orientation of deformation and stress–strain in layered surrounding rock vary angularly, particularly under the coupled influence of α and β. Tunnel stability shows positive correlation with burial depth H and negative correlation with layer thickness h, though the beneficial effect of h can be diminished or reversed under unfavorable α–β–λ combinations. The influence of the lateral pressure coefficient λ on surrounding rock deformation exhibits highly nonlinear behavior and is modulated by α and β. Three high-risk failure modes are identified: (1) bedding slip shear failure (α → 0°, β ≈ 45°) with extreme vault settlement; (2) bending-shear failure (H ≥ 300 m, λ ≤ 0.8, β ≥ 60°) featuring high localized shear strain; and (3) shear-buckling failure (λ ≥ 1.5, h ≤ 0.5 m, β ≤ 10°) where both settlement and shear strain peak. Corresponding support strategies are proposed, including pre-stressed anchors perpendicular to bedding, long cables with heavy steel arches, and closed-ring support systems with yielding elements. These findings provide practical guidance and a theoretical foundation for designing tunnel stability measures in complex geological environments.