Research on the Cracking Behavior of Lining in an Open Section of a Highway Tunnel Considering Backfill Influence
The safety and stability of highway tunnel engineering structures are crucial to the reliability of transportation systems.The cracking problem of tunnel lining directly affects the strength and durability of the structure,resulting in serious safety hazards.Based on the on-site investigation of the cracking situation of the lining of a highway tunnel in Fujian,the extended finite element XFEM calculation method was used to clarify the cracking mechanism of typical sections under the influence of backfilling,and to determine the safety factor of the main sections.Compare the application effects of different reinforcement methods and provide optimal treatment suggestions and measures.The results show that:1)The cracks of the tunnel entrance are mainly divided into two types:longitudinal cracks in the lining and cracks in the arch filling layer.The cracks are mainly caused by uneven settlement of the foundation and adjacent tunnel construction disturbances;2)The crack disease causes the overall safety factor of various parts of the typical section to be lower than the standard value,with a difference of up to 56.25%;3)After comparing the treatment methods of locking foot steel pipe pile reinforcement,inverted arch tunnel bottom foundation reinforcement,steel strip reinforcement,and fiber cloth reinforcement,it is pointed out that the inverted arch tunnel bottom foundation reinforcement is the preferred solution,which can increase the section safety factor by more than 5 times.This study can provide reference for the analysis and treatment of cracking diseases in similar tunnel engineering.
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