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解放以来,我国修建了很多拱坝,随着社会主义四化建设的发展,修建的拱坝数量将会更多,因此,拱坝的变形观测也引起了人们的关心和注意。拱坝的水平位移观测不同于直线型坝,它不仅要观测径向位移,还要观测切向位移。50～60年代建成的拱坝,一般都采用三角测量、前方交会或视准线等法进行观测。用前两种方法观测拱坝水平位移虽然是可行的,但精度不够理想,且观测周期长,因此,并不是理想的方法。视准线法的原理简单,精度也
Since the liberation, many arch dams have been constructed in our country. With the development of socialist modernization, more dams will be constructed. Therefore, the deformation observation of arch dams has aroused people’s attention and attention. The horizontal displacement of arch dam is different from that of linear dam. It not only observes the radial displacement, but also observes the tangential displacement. Arch dams built in the 1950s and 1960s are usually surveyed by triangulation, intersection or sight line method. Although it is feasible to observe the horizontal displacement of the arch dam with the first two methods, the accuracy is not ideal and the observation period is long, therefore, it is not an ideal method. The principle of sight line method is simple, the accuracy is also