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Assessment of the influence of water - level elevation in the reservoir on settlement of the hydroelectric dam

Elevation of the water level in the reservoir is the main reason for the deformation of the hydropower dams. Thus, assessing the influence of this cause on the displacement of construction is extremely necessary, which helps understand the state of dam and evaluate its safety to prevent sudden accidents that damage people and properties. Therefore, the article researches theoretical basis and builds the procedure of data processing in the algorithm of least squares to calculate the subsidence value caused by the influence of water - level elevation on the dam. The monitoring data of Yaly hydroelectric dam at two positions M5 and M26 was used in the experimental calculation. The results indicated that when the highest water level is 515.53 m, the subsidence values caused by this factor at M5 and M26 were 5.2 mm and 0.2 mm, respectively. On the other hand, when the lowest water - level is 491.2 m, the subsidence values caused by this factor at M5 and M26 were -7.7 mm and -1.9 mm, respectively. This demonstrates that the proposed calculating method is entirely feasible, reliable, and suitable for every hydroelectricity dam.