西北水电Issue(1)：60-64,5.DOI:10.3969/j.issn.1006-2610.2026.01.010
红层膨胀岩隧洞开挖变形特征及衬砌支护效果研究
Study on Excavation Deformation Characteristics and Lining Support Effect of Tunnels in Red Bed Expansive Rock
摘要
Abstract
To solve the structural stability problems caused by the characteristics of softening and swelling when wetted and shrinking when dried during excavation,taking the tunnels in red bed expansive rock of the Sichuan Basin as the research object,this paper systematically analyzed the excavation deformation characteristics of tunnels and the effect of lining support by combining laboratory tests with numerical simulation methods.The results show that excavation unloading causes the plastic zone to expand to 2～3 times the tunnel diameter,forming an annular shear failure zone,with the maximum principal stress around the tunnel reaching 4.26 MPa(without lining).Lining significantly inhibits surrounding rock damage:the range of the plastic zone is reduced by 33%(narrowed to 1～2 times the tunnel diameter),the crown settlement is decreased by 65.1%(from6.90 mm to 2.41 mm),and the invert displacement convergence is reduced by 11.1%(from22.50 mm to 20.00 mm).Lining optimizes the stress-displacement distribution:the maximum principal stress at 1 time the tunnel diameter is re-duced by 56.6%(from7.05 MPa to 3.06 MPa),and the stable value of vertical displacement is decreased by 44.7%(from 5.12 mm to 2.83 mm).The research results can provide theoretical support for the safety design and construction control of similar projects.关键词
红层膨胀岩/隧洞变形/衬砌支护/围岩稳定性Key words
red bed expansive rock/tunnel deformation/lining support/surrounding rock stability分类
建筑与水利引用本文复制引用
郭晓东,薛宇航,王媛媛,赵凌峰..红层膨胀岩隧洞开挖变形特征及衬砌支护效果研究[J].西北水电,2026,(1):60-64,5.基金项目
陕西省创新能力支撑计划(2022TD-01) （2022TD-01）
