研究复杂结构物时(双曲拱坝及坝上的发电引水管、溢洪道和其他和坝体结合的结构物)常用大大简化了的数学或物理模型,它有时导致结构物重要部位的应力失真,例如在坝和岩基接触区附近。本文讨论了边界条件(用有限元法)和组合结构物(用模型)对坝体应力分布的影响,并用复杂的光弹模型来研究拱坝及其组合结构物的应力场的相互影响。 Complex mathematical structures or physical models are commonly used when studying complex structures (such as double-arch dam and power-generating diversion pipe on the dam, spillway and other structures combined with the dam), which sometimes leads to stress distortions in important parts of the structure, For example near dams and rock-fill contact areas. In this paper, the influence of boundary conditions (using finite element method) and composite structure (model) on the stress distribution of dam body is discussed. The complex photo-elastic model is used to study the interaction between stress field of arch dam and its composite structure.