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  Study on the Damage Evolution in Secondary Tunnel Lining Under the Combined Actions of Corrosion Degradation of Preliminary Support and Creep Deformation of Surrounding Rock

  This article presents a numerical approach to study the damage evolution of secondary tunnel lining under the combined actions of corrosion of the preliminary support and the creep deformation of the surrounding rock. Three new models, including the tensile failure of corroding rock bolt, the yielding of corroding steel arch and the elastoplastic damage of concrete, were put forward and implemented in the computer code FLAC3D (Fast Lagrangian Analysis of Continua 3D), and the mechanical response of the supporting structures was investigated. The results showed that: (1) The mechanical behavior of the steel arch under compression-bending action, the non-linear increase, non-linear decrease and failure of the rock bolt with the increase of axial strain, and the damage of concrete can be well described using this numerical approach; (2) Due to the load transferring from preliminary support to secondary lining after the corrosion and yield of the preliminary support, the damage level of the same location in secondary lining for the corrosion yield model is larger than that of the original model.

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