白鹤滩谷幅变形特征的多类函数自适应方法分析研究  

Study on valley deformation characteristics of Baihetan Reservoir based on adaptive multi-function method

作　　者：李明熹 史宏娟 徐建荣 刘渊泽 徐卫亚[2,3] LI Mingxi;SHI Hongjuan;XU Jianrong;LIU Yuanze;XU Weiya(Baihetan Project Management Department,PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,China;Research Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司白鹤滩工程管理部,杭州311122 [2]河海大学岩土工程科学研究所,南京210098 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098

出　　处：《水力发电学报》2025年第4期31-41,共11页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金重点项目(51939004);国家重点研发计划项目(2018YFC0407004);中央高校基本科研业务费专项资金资助(B200203093)。

摘　　要：为深入理解峡谷区高拱坝谷幅变形特征,开展谷幅变形特征相关量化分析十分重要。本文基于金沙江白鹤滩高拱坝多年谷幅变形原位监测资料序列,提出一种多类函数自适应谷幅变形特征分析方法。对谷幅变形原位监测数据进行预处理及变分模态分解,通过快速傅里叶变换筛选模态分解信号,结合分位数法构建凸显度因子,标定函数项数取值范围,计算多类函数最优拟合结果,确定谷幅变形值时间序列显式表达式,求解谷幅变形速度、加速度显式模型。以白鹤滩谷幅变形典型测线数据为例,明确了工程谷幅变形特征。研究表明,该方法可实现谷幅变形、速度、加速度时间序列显式求解,提升变形特征分析结果的可信度和实用性,对深入理解高拱坝谷幅变形特征机理及工程安全具有重要理论意义和工程应用价值。To achieve a deep understanding of the valley deformation in a high arch dam region,it is essential to conduct a quantitative analysis of the deformation characteristics.This paper describes a multi-function adaptive analysis method for this purpose,based on long-term in-situ monitoring data from the Baihetan high arch dam on the Jinsha River.This method involves preprocessing the data and decomposing them through variational mode decomposition,followed by the selection of its modal signals via fast Fourier transform.It determines the range of peak count values using a prominence factor derived from the quantile method,and performs data fittings with three types of base functions truncated to different numbers of terms.Then,by using an explicit expression formulated for valley deformation,we derive explicit models for its velocity and acceleration.In a case study of the Baihetan Reservoir,typical monitoring data are used to demonstrate the analysis of valley deformation characteristics.The results have verified that our method achieves explicit solutions for the time series of valley deformation and its velocity and acceleration,enhancing the reliability and practical applicability of the analysis results.The findings,grounded with the Baihetan in-situ measurements,have theoretical and practical significance for the development of high arch dams.

关 键 词：特高拱坝 谷幅变形 变形特征 变分模态分解 多类函数自适应方法 白鹤滩水电站 

分 类 号：TV697.2[水利工程—水利水电工程]