中文摘要：

对于地基沉降、高水位差变化、突发地震等不利工况来说，沉管接头剪力键是控制接头剪切刚度和变形的关键要素，通过混凝土塑性损伤本构建立接头剪力键模型，进而对沉管隧道接头的安全性、耐久性、力学性能进行一定的研究。运用有限元方法并结合适当的材料本构模型对沉管接头进行数值模拟，可为后续大比尺模型试验的设计提供一定参考依据。采用混凝土材料的塑性损伤本构模型，考虑混凝土应力．应变的非线性以及GINA止水带压缩变形的非线性，通过沉管隧道接头的三维精细化建模，按照实际工程情况分别研究了不同水压下管节接头的水平剪切刚度、最不利工况下管节接头的水平剪切极限承载力、钢筋混凝土剪力键的剪切破坏形态和力学特性，预测了管节接头的力学性能以及剪力键的破坏发展形式。

英文摘要：

Shear keys of immersion joints are the key elements to resist deformation and determine the shear stiffness of immersed tunnel joints in consideration of unfavorable conditions like differential settlement, great water level difference, emergency earthquake and so on. Shear keys models which are based on the plasticity damage model can explore the research of the security, durability and mechanical property of immersed tunnel joints. Combing the finite element method with suitable constitutive models is helpful to the design of big scaled specimen experiment. To explore the shear stiffness of immersion joints which are under different water levels, the ultimate shear bearing capacity on the most unfavorable condition and the failure mode of concrete shear keys, models are built with the plasticity damage model, nonlinear stress-strain behavior of concrete and the nonlinear loading-displacement behavior of rubber are both taken into account. This paper estimates the mechanical property of immersion joints as well as the concrete shear keys.