关键词: 全站仪, 视准线小角度法, 中间设站, 监测精度

Abstract: Collimation method is most commonly used in monitoring of horizontal displacement of a dam. With the popularization and application of total station instead of theodolite, the total station is widely used for horizontal displacement monitoring with the collimation line small angle method. To ensure the accuracy, one or more intermediate stations should be added as the maximum length of the collimation line of concrete dam is more than 300 m, while the maximum length of the collimation line of earth dam is more than 500 m. The analysis and practice of segment monitoring shows that it is of high precision provided that the displacement monitoring precision of the intermediate station is well controlled.

Key words: total station, collimation line small angle method, intermediate station, monitoring precision