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以原型监测为基础,将实测值分析与理论推导相结合,对乐滩水电站运行期大坝变形的时空分布规律进行分析和评价。位移分析表明:坝基变形量及测值变幅普遍小于坝顶,由于分析时段内库水位变化较小,温度是影响坝体变形的控制因素;坝顶沉降量冬季大、夏季小,沿横河向呈不规则敞口“U”形分布,河谷坝段沉降普遍大于岸坡坝段;坝顶水平位移夏季向上游变化,冬季向下游变化,沿横河向呈不规则敞口“W”形分布,这与不同坝段的结构有关。挠度分析表明:坝体水平变形量随观测高程的降低呈递减规律,坝顶衰减速率快,至坝基变形趋于稳定。综合分析认为,坝体变形的时间演化规律和空间分布规律正常,大坝目前处于安全状态。
Based on the prototype monitoring, combining the measured value analysis with the theoretical derivation, the spatial and temporal distribution of dam deformation during operation of Letan Hydropower Station is analyzed and evaluated. Displacement analysis shows that the deformation and the amplitude of the dam foundation are generally less than that of the dam crest. Because the change of reservoir water level is small during the analysis period, the temperature is the controlling factor affecting the dam deformation. The crest settlement is large in winter and small in summer, The horizontal displacement of the dam top changes in the upper reaches in summer and changes in the lower reaches in the winter, and it is irregularly exposed along the Yokogawa River. W "shape distribution, which is related to the structure of different sections. Deflection analysis shows that the horizontal deformation of the dam shows a decreasing rule with the decrease of the observed elevation, and the decay rate of the dam crest is fast, and the deformation of the dam foundation tends to be stable. According to a comprehensive analysis, the time evolution and spatial distribution of the dam deformation are normal, and the dam is in a safe state at present.