Numerical Analysis on the Coupling of Thermal Field and Stress Field in the Shield Tunnel Segment under Fire

Combined with engineering example,a finite element model for lining structure was established by ANSYS program.Apply temperature load in tunnel,analyze the temperature distribution of lining structure first,and then based on it,make a mechanical analysis of lining structure under fire,and obtain the rule of temperature distribution and stress variation of lining structure under fire.Finally,further analyze the failure spot of lining structure under fire.This study provides a theoretical basis for further study on safety evaluation of shield tunnel under fire.