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This paper presents the cause analysis, treatment plans and treatment results of a settlement deformation accident at tunnel portal area of left line T1 tunnel in Algeria North-South Expressway. The engineering practice demonstrated the feasibility, timeliness, and safety of the treatment plans. The successful handling of the accident provided an important reference for the formulation of the settlement deformation treatment plans in the tunnel portal areas.

Treatment Plans of Settlement Deformation at Expressway Tunnel Portal Area