Study on progressive failure behavior and mechanical properties of tunnel arch support structures

doi:10.1016/j.tust.2023.105285

Study on progressive failure behavior and mechanical properties of tunnel arch support structures

2023-10-01

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DOI：10.1016/j.tust.2023.105285

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Multi-layer composite support structure is widely applied in tunnel excavation but shows complicated failure behavior under rock pressure. Local joint broken, out-of-plane instability and arch-shotcrete interface slip widely exist and highly weaken the overall strength of support structure, which is inconsistent with the ideal assumption, leading to sever engineering disaster. Based on above situation, this paper adopts laboratory and numerical methods to investigate the bearing mechanism and failure behavior of arch joint, arch frame and archshotcrete composite lining. Then, a modified safety evaluation method of arch is proposed based on convergenceconfinement method. The research results proved that, component strength and arch critical instability strength check are necessary in arch design. On the other hand, compared with thin-walled steel arch, the concrete-filled steel tube arch shows higher critical instability strength and better ductility, effective for controlling large deformation of soft rock. The research conclusions can provide reference for related tunnel design and construction.

Keywords:

Underground excavation

Concrete-filled steel tube arch

Compression-bending strength of arch joint

Arch structure instability

Arch-shotcrete interaction

Study on progressive failure behavior and mechanical properties of tunnel arch support structures

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