Scholarlink

<p>To study the stress distribution in surrounding rock (SR) of small clearance tunnels under shallow burial, bias pressure, and staggered height conditions. Theoretical equations for the SR pressure of shallow buried biased pressure staggered small clearances tunnel (SBBPSSCT) are derived based on the limit equilibrium method. The applicability conditions of these equations are determined. The reliability of the theoretical equations was verified by numerical simulations. The effects of various influencing factors on SR rupture angles, lateral pressure coefficients, slip resistance, vault, and horizontal pressure were investigated. The results show that the excavation of the right tunnel leads to a decrease in the lateral pressure coefficient inside the left tunnel, a reduction in the horizontal pressure, and an increase in the vault vertical pressure when the tunnel excavation sequence is considered. The bias angle has a significant effect on the vertical and horizontal pressures on the SR. The SR pressure shows a linear increasing trend with the tunnel burial depth. Staggered height (<i>d</i>) variations greatly influence tunnel rock pressure, especially in the right tunnel compared to the left. As <i>d</i> increased from 0&#xa0;m to 10&#xa0;m, the slip resistance on the outside of the right tunnel decreased significantly by 52.5%, while the left tunnel’s remained unchanged. The increase in tunnel clearances has led to the transition from a small clearance tunnel to a separate single tunnel. The critical threshold is 22.36&#xa0;m. This study can provide a theoretical reference for the design of similar tunnel projects in mountainous terrain.</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

Study on stress distribution characteristics in small clearance tunnels under complex conditions

  • 期刊论文

  • 发表日期：

    2025年10月29日

查看全文
  • Jiazheng Chen,
  • Shuqi Ma,
  • Ao Liu,
  • Xiangchen Yao,
  • Yuanzhen Xu,
  • Zhaoyuan Zhang

摘要

To study the stress distribution in surrounding rock (SR) of small clearance tunnels under shallow burial, bias pressure, and staggered height conditions. Theoretical equations for the SR pressure of shallow buried biased pressure staggered small clearances tunnel (SBBPSSCT) are derived based on the limit equilibrium method. The applicability conditions of these equations are determined. The reliability of the theoretical equations was verified by numerical simulations. The effects of various influencing factors on SR rupture angles, lateral pressure coefficients, slip resistance, vault, and horizontal pressure were investigated. The results show that the excavation of the right tunnel leads to a decrease in the lateral pressure coefficient inside the left tunnel, a reduction in the horizontal pressure, and an increase in the vault vertical pressure when the tunnel excavation sequence is considered. The bias angle has a significant effect on the vertical and horizontal pressures on the SR. The SR pressure shows a linear increasing trend with the tunnel burial depth. Staggered height (d) variations greatly influence tunnel rock pressure, especially in the right tunnel compared to the left. As d increased from 0 m to 10 m, the slip resistance on the outside of the right tunnel decreased significantly by 52.5%, while the left tunnel’s remained unchanged. The increase in tunnel clearances has led to the transition from a small clearance tunnel to a separate single tunnel. The critical threshold is 22.36 m. This study can provide a theoretical reference for the design of similar tunnel projects in mountainous terrain.