砌石拱坝是成层异向弹模结构，从微观上剖析各部位都有微裂隙，从宏观上剖析无论是平面还是立面都有构造缝．构造缝是设计或施工或构造需要而预先留置的间隙．这种间隙走向与拱坝径向平行的称为横缝，与拱坝弧向平行的称为纵缝．横缝及纵缝面按倾向分又有水平缝和竖向缝．拱坝 Stone masonry arch dam is the anisotropic elastic deformation of the formation of the structure, microscopic analysis of the various parts of the micro-cracks, macroscopically, whether the plane or the facade has a structural seam. Structural joints are designed or constructed or constructed as needed for pre-emptive gaps. This gap to the radial direction of the arch parallel to the known as transverse joints, arch and arc parallel to the longitudinal seam. Transverse joints and longitudinal joints according to the tendency of points have horizontal and vertical joints. arch dam