不同观测方法下的视准线水平位移观测精度分析

Analysis on the Accuracy of Horizontal Displacement Measurement by Collimation Line with Different Observation Methods

以范厝水电站大坝坝顶视准线为例,从理论分析和实测资料分析的角度,研究了采用活动觇标法和小角度法进行视准线水平位移观测时的观测精度问题。研究表明,活动觇标法和小角度法均可用于视准线水平位移观测,但当视准线较长时,两种方法的观测精度均不够理想。因此,在设计时,应确保视准线的长度在规范允许的范围内;在实际观测时,应采用更高精度的观测仪器。

Taking the Fancuo Hydropower Station as an example, observation accuracies of the moving target method and the minor angle method, which are used to observe the horizontal displacement of the collimation line, are studied based on the measurement theory and the analysis of actual measured data. The results show that both the moving target method and the minor angle method can be applied to observe the horizontal displacement of the collimation line. How- ever, the observation accuracies of these two methods are not satisfactory when the collimation line is too long. There- fore, the length of collimation line should be controlled within the allowable value prescribed in the design code and the observation instruments with higher precision should be adopted in actual observation.