Considering the influence of soil-structure interaction by 2D finite element analysis

the nonlinear dynamic interaction between soil and subway tunnel is modeled.In the modeling

dynamic visco-plastic memorial nested yield surface model is used to model dynamic characteristics of soils

and plastic-damage model is used to model dynamic characteristics of tunnel concrete.Considering the slip of soil-tunnel subjected to strong earthquake

the dynamic contact effect is analysed by using node-line contact element based on penalty function method and Lagrange multipliers method.By comparing the effect of soil-subway dynamic contact on the normal contact compressive stress

the tangential contact shear stress and tangential slip

the result shows that penalty function method used is more suitable than Lagrange multiplier method used in the dynamic contact problem of soil and tunnel system.The normal contact compressive stress gradually increases with the increasing of tunnel depth.The tangential contact shear stress and tangential slip is relatively great on the top

the bottom and the lateral of tunnel.And then

the results of contact effect and deformation compatibility are compared.The comparison results show that the acceleration response of soil and subway tunnel with dynamic contact effect is higher than that of deformation compatibility.