Abstract:In order to better study the safety and reliability of large-diameter shield tunnel structural engineering, the stress of typical cross-section lining segments in actual engineering is selected for calculation and analysis. Taking the Zhanjiang Bay underwater shield tunnel of the Guangzhou Zhanjiang high-speed railway as the background, the structure and surrounding rock mass of the shield tunnel were modeled using the large-scale finite element software ANSYS for the lining segments. The stress situation of the lining segments after a period of construction was obtained, and compared and analyzed with the on-site monitoring data. The soil pressure and water pressure experienced by the lining pipe segments remain stable for a period of time after the construction is completed; There are certain differences in soil pressure at different testing points on the same monitoring section, with greater stress at the arch crown and arch waist positions, and particularly significant pressure values at the arch crown position. It is recommended to pay attention to the changes in pressure values at the arch crown and arch waist during the tunnel construction period; By comparing the on-site monitoring data and numerical simulation data of six section pipe segments， the internal force results at the corresponding positions of each section are relatively close. Therefore， under certain numerical simulation assumptions, the numerical model can accurately reflect the actual stress situation of the lining pipe segments.
