Abstract: In order to estimate the seismic weak parts of a crossing-active fault urban metro tunnel more fastly and accurately, the finite element method of pseudo-static elastoplasticity is used for numerical simulation to nonlinear reaction of metro tunnel by strike-slip fault, taking the range of Beijing metro line 7 as an study object. Based on the established reasonable damage plastic constitutive model, damage index is adopted to research the failure mode of lining structure, especially the first position, process and final degree of damage. The statistic formulas estimating structural damage region and the most severely location are developed. The results show that: the damage range of lining structure is located in active fault under the effect of strike-slip fault; the destruction is the most serious at the hance. The degree of lining destruction can reduce with the increase of the ground thickness. It does not need to worry about the effect of strike-slip fault rupture on the shallow tunnel when the soil thickness is greater than or equal to the critical value of soil thickness. The damaged range of liner is related to magnitude and soil thickness, and the location of the most serious damage changes along with soil thickness. The obtained results play an important role in seismic design and safety evaluation.

Key words: metro tunnel, strike-slip fault, pseudo-static, damage analysis