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本文介绍混凝土坝位移确定性模型建立的基本原理、方法和公式,即用有限元法计算大坝某些观测控制点在外荷载作用下的位移,由此值与实测值进行最小二乘法拟合,求得水压分量和温度分量的调整参数和时效分量,从而建立位移的确定性模型。并以佛子岭连拱坝(以下称佛坝)13号垛的坝顶水平位移为算例,介绍确定性模型建立的全过程。实践证明,确定性模型与实测值的拟合精度较高,后验预报可靠。
This paper introduces the basic principle, method and formula for determining the deterministic model of concrete dam displacements. The finite element method is used to calculate the displacements of some observation control points of dam under the action of external loads. The values are fitted with the measured values by the least squares method. Obtained hydraulic components and temperature components of the adjustment parameters and aging components, to establish a deterministic model of displacement. Taking the horizontal displacement of dam top of Foziling Multi-arch Dam (No. 13) as an example, the whole process of establishing deterministic model is introduced. Practice has proved that the fitting accuracy of the deterministic model and the measured value is high, and the posterior predictions are reliable.