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鉴于提取大坝变形中的时效分量并分析其变化规律是判断大坝工作性态和安全性的关键,将小波分析法和回归分析法有机结合起来构建了小波分析—回归模型,即利用小波分析法提取混凝土坝变形中的时效分量后,再对剩余部分进行回归分析,并根据所提取的时效分量形式及剩余分量回归成果的分析比较,以确定提取时效变形的最优小波函数。实例应用结果表明,sym4模型拟合效果最好、精度较高,也满足复相关系数越大、下游水压分量百分比越小的规律。
In view of extracting the aging component of the dam deformation and analyzing its variation law is the key to judge the dam behavior and safety, the wavelet analysis and regression analysis are combined to build a wavelet analysis - regression model, that is, using wavelet analysis Method to extract the aging components of concrete dam deformation, and then the rest of the regression analysis, and based on the extracted form of aging components and residual components of the regression analysis of the results to determine the optimal time-dependent deformation of the wavelet function. The results of application show that sym4 model has the best fitting effect and high precision, and also meets the rule that the bigger the correlation coefficient is, the smaller the percentage of downstream hydraulic components is.