Currently the time-space deformation regular pattern of the surrounding rock of superlarge cross sectional slate tunnel during construction period is short of systematic summary.Taking Yaojia tunnel in Chang-Kun Hunan Section of Shanghai-Kunming Passenger Dedicated Line as an example

the time-space deformation regular pattern of tunnel under conditions of different excavation approaches was analyzed based on the field deformation monitoring data.The types of the relationship curves of the surrounding rock deformation with time and the distance to the tunnel working face were divided.The relationship of the surrounding rock displacement releasing rate with time and the distance to the tunnel working face was analyzed.The influence of surrounding rock grade and space location on time-space effect of surrounding rock deformation was researched.The results show that the surrounding rock deformation-time curve can be divided into "Bow"type and"Bench"type.The"Bow"type can be concluded into 3 deformation stages and it is suitable for surrounding rocks of grade III and grade IV.The"Bench"type can be divided into 4 deformation stages and it is suitable for surrounding rock of grade V.The relationship curve between surrounding rock deformation and the distance from the working face can be divided into"Single Chang"type and"Double Chang"type."Single Chang"type curve is fit for surrounding rocks grade III and grade IV.The surrounding rock deformation tends to be stable and the timespace effect disappears when the distance from the monitoring site to the working face is larger than 5 times of the tunnel diameter."Double Chang"type curve is suitable for surrounding rock of grade V.The surrounding rock deformation tends to be stable when the distance from the monitoring site to the working face is larger than 3 times of the tunnel diameter.Finally the surrounding rock displacement releasing rate under different rock grades with the change of time and the distance to the working face is put forward.The results can be taken as a reference for the research on long-term stability of surrounding rock of super large cross sectional soft rock tunnel.