To investigate the seismic performance of the immersed tunnel-foundation system, a spatial nonlinear model was established based on a modified model from Anastasopoulos (2007) method. In the spatial model, two key factors including temperature and prestress are synthetically considered. From a viewpoint of engineering practice, the influences of temperature loads and prestress tendons load on the seismic performance of the tunnel were studied numerically. Results show that: compared with the case of temperature rising, temperature falling load has more adverse effects on the seismic performance of the segmental immersed tunnel with respect to the deformation behaviors of joints and internal forces of segments. Retaining prestress tendons has favorable effects on the sealing of segmental joints, but has adverse effects on the sealing of immersion joints, and these adverse effects are more obvious in the temperature falling case.

为了研究沉管隧道基础系统的抗震性能，基于 Anastasopoulos (2007) 方法的修正模型建立了空间非线性模型。在空间模型中，综合考虑了温度和预应力两个关键因素。从工程实践的角度，数值研究了温度荷载和预应力筋荷载对隧道抗震性能的影响。结果表明：与升温情况相比，降温荷载对管片沉管隧道抗震性能的不利影响主要体现在节段变形行为和管片内力方面。保留预应力筋对节段接头的密封有良好的效果，