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一、观测方法的选择目前国内外观测大坝水平位移的常用方法有引张线法、激光准直法、视准线法、交会法、导线法等几种。一般说来,前三种方法观测精度较高,多用于直线形坝;后两种方法观测精度较低,但可同时测出径向和切向位移,故多用于曲线形坝。而从高精度观测大坝水平位移来看,则主要是采用前三种方法。
First, the choice of observation methods At present, the commonly used methods of observing the horizontal displacement of dam at home and abroad are lead-ray method, laser collimation method, line of sight method, intersection method, wire method and so on. Generally speaking, the first three methods have higher observation precision and are more used for rectilinear dam. The latter two methods have lower observing accuracy, but can measure radial and tangential displacements at the same time, so they are mostly used in curvilinear dam. From the perspective of high-precision observation dam horizontal displacement, the main method is to use the first three.