Based on rock resistant coefficient of redsandstone tunnel under the consideration of creep effect

Based on the Winkler local deformation theory,the surrounding rock of high-speed railway tunnel was classified into three finite ring model and the creep effect is considered. On the basis of the complete stress strain curve,the Burgers creep mechanical model was used to simulate the creep deformation of viscoelastic area and the resistance coefficient calculation formula was derived which can consider the effect of creep. For studying the characteristics of surrounding rock strength of red sandstone in tunnel lining design,with Shanghai-Kunming high-speed railway Diantangbian tunnel as a support project. And calculated the value of the resistant coefficient of this red sandstone consider creep effect or not. The following results were obtained: the resistance coefficient value of surrounding rock is reduced after considering the creep effect of red sandstone. When the red sandstone appearing weak surrounding rock crushing and with plastic flow deformation,the resistance coefficient of surrounding rock is not zero and still has the ability of the load of surrounding rock. This research result can also provide certain theoretical guidance for tunnel lining design.