Abstract: Logarithmic hyperbolic arch dam stress condition is good，so it is increasingly applied into practical engineering． Based on the study of various geometric parameters of logarithmic hyperbolic arch dam，the numerical model of logarithmic hyperbolic arch dam is established． Three-dimensional entity simulation is completed in Auto-CAD by using C++ programming language programming． Three-dimensional entity mode provides accurate entity mode for the future finite element analysis of arch dam．

Key words: logarithmic hyperbolic arch dam, arch axis, upstream and downstream arch arc, 3D modeling, C++ program design

摘要： 对数螺线双曲拱坝因为受力条件较好，越来越多地被应用到实际工程中。在研究对数螺线双曲拱坝各几何参 数的基础上，建立了对数螺线双曲拱坝的数学模型，运用C ++ 程序设计语言编程，在AutoCAD 中实现了三维实体仿 真，为拱坝下一步进行有限元分析提供了精确的三维实体模型。

关键词: 对数螺线双曲拱坝, 拱轴线, 上下游拱弧, 三维建模, C ++ 程序设计