小波分析—回归模型在混凝土坝变形分析中的应用

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。

Application of Wavelet Analysis and Regressive Model in Deformation of Concrete Dam

It is key to judge dam working behavior and safety that extracting time-dependent component of dam deformation and analyzing its variation law. Combined the method of wavelet analysis and regressive analysis, wavelet analysis regressive model is established. And time-dependent component of concrete dam deformation is extracted by wavelet analysis method. Then residue component is analyzed with regressive analysis. Finally, comparative analysis is used to determine the best wavelet function of time-dependent deformation. Example result show that the sym4 model has the best fitting effect and higher accuracy; it also satisfies the rule that the bigger multiple correlation coefficient is, the smaller percentage of downstream water pressure component.