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大坝观测系统设置的基准点,在库水位变化等外界因素影响下将产生变形。不同位置的基准点,变形的数值是不同的,它对观测精度将产生不同程度影响。基准点位置不同又涉及到基准点设置本身的技术和经济问题。本文结合丰满大坝激光观测系统基准点布置,通过理论分析计算,对大坝两端坝头、地基连同部分坝体的变位情况获得清晰的概念。评价了现有激光观测系统布置对观测精度的影响,并为倒垂基准点的选择提供了理论依据。
The reference point set by the dam observation system will be deformed under the influence of external factors such as the change of reservoir water level. Different positions of the benchmark, the value of deformation is different, it will have varying degrees of accuracy of the observation. The location of the fiducials also involves the technical and economic aspects of setting the fiducials themselves. Based on the arrangement of datum points of Fengman Dam’s laser observation system, this paper gives a clear concept of the displacement of the dam head and foundation along with some dam bodies by theoretical analysis and calculation. The influence of the arrangement of the existing laser observation system on the observation accuracy is evaluated, and a theoretical basis is provided for the choice of the inverted datum point.