Numerical analysis of a collapsed portal for shallow tunnel under asymmetrical pressure and its treatment

作者：Wang Hong^*; Jiang Chao

来源：Yantu Lixue/rock and Soil Mechanics, 2009, 30(11): 3481-3485.

• Asymmetrical pressure
• Commercial software
• During construction
• Excavation control
• Inner forces
• Numerical models
• Plastic zones
• Reinforced concrete lining
• Rock bolts
• Shallow tunnel
• Surrounding rock
• Tunnel collapse

During construction of the portal for a tunnel, collapse accident occurred. According to the field geological and construction conditions, the numerical model is set up; and the commercial software ANSYS is adopted to simulate the behaviors of the tunnel and surrounding rock. Based on the results of plastic zones in surrounding rocks, deformations in rock and lining, and the inner forces within rock bolts and reinforced concrete lining, the deformation of the tunnel and the causes of tunnel collapse are analyzed. The results show that: shallow tunnel bias, poor mechanical properties of rock and construction support landslides resulting from collapse. The comprehensive remedy measures consisting of reinforcement inside, surface grouting reinforcement and excavation control are proposed. Good results are achieved so as to offer reference for the future similar projects.

• 出版日期2009