测边前方交会法在广蓄上库坝的应用

当坝肩附近难以找到适合的工作基点或需同时观测大坝两个方向的位移时，一般采用测边前方交会和测角前方交会两种方法来观测大坝水平位移。在广州蓄能电厂上库坝水平位移观测系统设计实施过程中，对这两种前方交会法的观测方法及其精度进行了深入的比较，最终选择了测边前方交会法。同时介绍了上库坝水平位移观测系统的布置、精度分析、方法选择及应用中应注意的问题。

Application of side-measured forward intersection method to the upper reservoir dam of the Guangzhou Pumped Storage Plant

When it is difficult to find proper working basic point in the near of dam abutment or it is necessary to observe the displacements in two directions of dam at the same time, two methods of side-measured forward intersection and angle-measured forward intersection are adopted to observe the horizontal displacement of dam. In the design and implementation of observation system of horizontal displacement of the dam for the upper reservoir of Guangzhou Pumped Storage Plant, such observation methods and their accuracy have been deeply compared and the side-measured forward intersection method has been finally selected. Meanwhile, this paper also describes layout of observation system of horizontal displacement of the dam for upper reservoir, its accuracy analysis, method selection and some problems that should be paid attention to in the application.