针对在水利土木大型混凝土结构工程中 ,新旧混凝土及岩体与混凝土的交界面对结构的安全有重大影响的问题 ,提出一种材料非线性的接缝数值模型。该模型可以模拟大型混凝土结构工程中不考虑法向粘结作用的交界面。在该模型中 ,同时考虑了缝面在法向和切向方向的材料非线性 ,接缝张开时 ,缝面不传压不传剪不传拉 ;接缝闭合时 ,缝面传压传剪不传拉。接缝的切向刚度除了和切向应变相关以外 ,还与缝面的法向压应力相关 ,压应力越大 ,切向刚度越大 ,但也不能无限增大。该模型已经成功地应用于三峡水利工程中的永久船闸闸室边墙衬砌锚固力的优化研究之中并得到令人信服的结果 ,提高了非线性混凝土结构仿真结果的可靠性与置信度 Aiming at the problem that the interface between old and new concrete and rock mass and concrete have a significant influence on the safety of structures in large-scale water conservancy and civil engineering, a nonlinear numerical model of joints is proposed. The model can simulate the interface of large-scale concrete structures without considering the normal bonding. In this model, the material nonlinearities in the normal and tangential direction of the seam are also considered. When the seam is open, the seam surface does not transfer pressure and does not transmit and pull. When the seam is closed, Pull pull. In addition to the tangential strain of the joint, the tangential stiffness of the joint is also related to the normal compressive stress of the seam. The greater the compressive stress, the greater the tangential stiffness, but it also does not increase indefinitely. The model has been successfully applied in the optimization of the anchorage force of the permanent ship lock chamber sidewall lining in the Three Gorges Project and has obtained convincing results and improved the reliability and confidence of the nonlinear concrete structure simulation results