在宝泉电站高压引水管道的变形观测中,我们采用了视准线法测定管道各部位的水平位移,其中部分视准线端点设在管道的镇墩上。因为镇墩是固定管道的,充水后可能会发生位移。于是在端点周围的岩石上选择了部分点作为固定点,用后方交会法测定可能发生的水平位移。由于水平位移是充水前后端点的座标变化量,不一定要得知这些固定点的座标值。因 In the deformation observation of the Baoji Hydropower Station high-pressure diversion pipe, we adopted the method of the line-of-sight to measure the horizontal displacement of each part of the pipe, some of which are located on the piers of the pipe. Because the piers are fixed pipes, displacement may occur after water is filled. Then, select some points on the rocks around the endpoints as fixed points, and determine the possible horizontal displacement by the rear intersection method. Since horizontal displacement is the amount of change in the coordinates of the end points before and after water filling, it is not necessary to know the coordinates of these fixed points. because