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提出了刚体－界面元、有限元与半无限元相耦合的算法，研究了挡水结构系统的动力特性及在地震激励下的动力响应。对于结构的主要部分用刚体－界面元离散，对结构的迎水面部分用有限元离散，在两种单元的交接面上设置了过渡单元，采用有限元和半无限元相结合模拟了水体的宽广性。文中导出了相关公式，编制了相应的计算程序，数值算例结果与有关文献比较，证实了提供方法和编制程序的正确性，并说明该方法具有简便，工作量少和计算精度高的优点。
The rigid body - interface element, coupled finite element method and semi - infinite element method are proposed. The dynamic characteristics of the retaining structure system and the dynamic response under earthquake excitation are studied. For the main part of the structure, it is discretized by rigid body-interface element, the finite element is scattered on the water-facing part of the structure, and the transition element is set on the interface of the two elements. The finite element and semi-infinite element are used to simulate the broad water body Sex. The relevant formulas are deduced and corresponding calculation programs are compiled. The results of the numerical examples are compared with those of the relevant documents, which proves the correctness of the methods and compilation procedures. It also shows that the method has the advantages of simplicity, less workload and high computational accuracy.