Dynamic Reliability of an Underground Structure Based on the JC Method

Based on the JC method, the dynamic reliability analysis method of underground structure is presented. Considering the influence of soil-station structure interaction for 2D finite element analysis, the nonlinear dynamic interaction of soil-tunnel structure is modeled. In the modeling, a dynamic Davidenkov model is used to model dynamic characteristics of soils, and a plastic-damage model is used to model dynamic characteristics of station structure concrete. The stress characteristics of a tunnel structure under ground motion is analyzed. Furthermore, the dynamic reliability of a tunnel structure is analyzed deeply. The reliability and reliability index are obtained so that the reliability of the subway tunnel structure is evaluated. The result shows that the reliability of the upper right side of a tunnel structure at a 45° position is the lowest, and the reliability of the lower right side of tunnel structure at a 45° position is lower. It is consistent with the stress response of tunnel structure. When the near fault ground motions of Northridge wave and Chi-chi wave are input, the dynamic reliability of tunnel structure is minimum because of the pulse effect of the earthquake wave. Overall, under the 0.1g and 0.2g ground motion, the tunnel structure reliability is high, so it is safe and reliable.