Abstract
Debris flow accumulation has the characteristics of loose and broken, low strength, poor stability and so on. When the tunnel passes through the debris flow accumulation area, it is easy to bring major safety hazards to the construction site. Based on the engineering background of Gangou tunnel crossing debris flow accumulation area in the fourth bid of Jiumian expressway, this paper establishes a numerical calculation model, studies the large deformation characteristics of tunnel surrounding rock in debris flow area, determines the reasonable reinforcement range of tunnel surrounding rock, and puts forward the comprehensive control technology of tunnel passing through debris flow accumulation body combining surface stability and underground reinforcement based on simulation results and field experience. The numerical results show that the deformation of surrounding rock and ground surface can be effectively controlled. The rationality of the proposed control measures is verified by field monitoring, which provides a reference for surrounding rock control of tunnel under type conditions.
Highlights
The geological conditions in the central and western regions of China are complex, and some weak surrounding rock areas with bad geological environment are often crossed in highway construction
The disasters and accidents of tunnels passing through the bad geological environment have occurred constantly
It is of great significance to study the large deformation characteristics of surrounding rock and the corresponding reinforcement control technology for the tunnel passing through debris flow accumulation body to ensure the long-term stability of the tunnel
Summary
The geological conditions in the central and western regions of China are complex, and some weak surrounding rock areas with bad geological environment are often crossed in highway construction. Highways usually choose to stay away from or avoid bad geological areas such as debris flow when selecting lines, but with the rapid development of highways in China and the continuous improvement of line linear standards, more and more highway tunnels inevitably cross the debris flow accumulation area. It is of great significance to study the large deformation characteristics of surrounding rock and the corresponding reinforcement control technology for the tunnel passing through debris flow accumulation body to ensure the long-term stability of the tunnel. Taking Gangou tunnel as the engineering background, this paper analyzes the characteristics of large deformation of tunnel surrounding rock in debris flow accumulation area by establishing three-dimensional numerical model. It puts forward technical measures for tunnel surrounding rock reinforcement through debris flow accumulation, and further verifies the rationality of comprehensive technical measures of surrounding rock reinforcement by establishing numerical model calculation and field monitoring
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