Dividing the storey deformation into shear deformation and flexural deformation,by amendatory contra-flexure point method of wall-frame and the equivalent continuum method,a simplified method is carried out to analyze the famed-tube structure subjected to the lateral loads.

The flexural deformation and forces can be calculated by the equivalent continuous system method, in which the main influencing parameters of shear lag are discus sed.

The action forces applied on rock mass of equivalent continuum by seepage include two parts, i.

By the linkage between the seepage coefficient,porosity and stress,the hybrid analysis model for coupled seepage and stress field in rock mass of equivalent continuum is established.

The level 1 is real fracture network, the level 2 random fracture network, the level 3 equivalent continuum and the level 4 continuum.

Based on the shield tunnel equivalent continuous model and elastic foundation beam theory, this paper primarily studies shield tunnel longitudinal structure deformation behavior and the state of stress, it provides some references for the longitudinal design.