To study the deformation performance of tunnel lining under high temperature of fire

three-dimensional analysis model was built using ABAQUS finite element software

in which HC temperature curve was used as a reference heating curve.The distribution of temperature field of tunnel lining structure and the deformation of reinforced concrete lined diversion tunnels were analyzed.Parametric analysis was done including following factors influence:ground overload

the coefficient of lateral pressure

fire duration

peak temperature and heating rate on deformation.Results show that

when the ground overload is small

the vault will be close to the surrounding rock with the temperature increasing

and vice versa.The displacement of the hance increases with increase of overload.With increasing the coefficient of lateral pressure

the vault will move outside and the hance will move inside.The longer the fire duration or the higher the peak temperature

the vault will be further from the surrounding rock and the hance will be closer to it.The heating rate has great influence on the deformation of the tunnel lining in the initial stage of thermolysis and has no significant influence at later stage.