成果归属机构：

工程技术学院

作者：

Qu, Ziming ; Xue, Yiguo ; Kong, Fanmeng ; Zhou, Cuiying ; Qu, Jingkai ; Liu, Zhen

单位：

China Univ Geosci Beijing, Sch Engn & Technol, Beijing 100083, Peoples R China;Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Peoples R China;Sun Yat Sen Univ, Sch Civil Engn, Guangzhou 510275, Peoples R China

摘要：

In order to solve the problems of large and nonuniform deformation of the surrounding rock, cracking and spalling of the lining of red beds tunnel excavation, the deformation mechanism of composite strata in red beds tunnel excavation was analyzed based on Leye tunnel of Chongqing-Kunming High-speed Railway, and the design of supporting structure was optimized. Firstly, optical identification tests, uniaxial compression tests, triaxial compression tests, and scanning electron microscopy tests were conducted to analyze the mineral composition, mechanical properties and micro-interfacial characteristics in order to investigate the rock properties and mechanical differences between red beds mudstone and sandstone. Subsequently, based on the obtained physical and mechanical parameters of the red beds mudstone and sandstone, the instability evolution law of surrounding rock of composite strata in red beds tunnel excavation was analyzed using the finite difference software FLAC-3D, and the design of the support structure was optimized, the optimal support parameters were proposed. Finally, the optimized support structure was applied in the field, and the field monitoring data showed a good deformation control effect, the optimized support reduces surrounding rock deformation by 82.7% and decreases the maximum deformation rate by 87.5%, which verified its efficacy in controlling the deformation of the surrounding rock in the composite strata of red beds tunnel excavation. The research results accurately reflect the deformation mechanism of composite strata in red beds tunnel excavation, and can provide theoretical guidance for the supporting structure design of corresponding red beds composite strata tunnels.

基金：

National Natural Science Foundation of China [42293351, U2468221, 42307228]; Science and Technology Innovation Special Project of the Xiong'an New Area [2023XAGG0067]

语种：

英文

DOI：

10.1016/j.tust.2025.107132

来源：

TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,2026():.

出版日期：

2026-02

提交日期：

2025-10-19

引用参考：

Qu, Ziming; Xue, Yiguo; Kong, Fanmeng; Zhou, Cuiying; Qu, Jingkai; Liu, Zhen. Research on deformation mechanism and support structure optimization of composite strata in red beds tunnel excavation[J]. TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,2026():.