特高拱坝长期运行时变效应的状态空间诊断方法

doi:10.13722/j.cnki.jrme.2022.0744

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摘要特高拱坝具有“三高一强”特点，长期运行中呈现复杂、多样和时变的变形性态，其中，时变特点隐含了大坝系统安全性的演化过程，对工程健康服役意义重大。规范明确指出，特高拱坝的变形性态需开展专项研究。本文首先分析国内典型特高拱坝的变形时变特性，然后，基于时变效应呈现的差异性，深入剖析特高拱坝时效变形的影响因素和形成机制；接着，考虑时效变形由多种因素叠加产生且不可直接监测，将时效变形视为状态向量，以实测变形作为观测序列，小波分解的趋势项作为状态序列，提出基于状态空间模型的特高拱坝时效变形分离方法；最后，提出时变效应的敛散性判别指标，实现了从时变角度开展大坝安全判定。成果可揭示特高拱坝时效变形的整体演变规律和趋势，并诊断大坝健康服役性能。

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关键词 ：水利工程, 特高拱坝, 实测资料, 时变效应, 状态空间模型, 敛散性分析

Abstract：The extra-high arch dam has the characteristics of three high and one strong. It exhibits complex, diverse and time-varying deformation behavior in long-term operation. Among them，the time-varying characteristics imply the evolution of dam system safety. This is of great significance to the service of engineering health. The specification clearly states that the deformation behavior of extra-high arch dams needs to be specifically studied. In this paper，the deformation time-varying characteristics of typical extra-high arch dams in China are analyzed. Then，based on the differences presented by the time-varying effects，the influencing factors and formation mechanism of the aging deformation of the ultra-high arch dam are analyzed in depth. Next，consider that the aging deformation is generated by the superposition of multiple factors and cannot be directly monitored. The aging deformation is regarded as a state vector，the measured deformation is used as the observation sequence，and the trend term of wavelet decomposition is used as the state sequence. A time-sensitive deformation separation method for ultra-high arch dams based on state-space model is proposed. Finally，the discriminant index of time-varying effect is proposed. This enables dam safety judgments from a time-varying perspective. The overall evolution law and trend of the aging deformation of ultra-high arch dams can be revealed, and the healthy service performance of the dam can be diagnosed.

Key words： hydraulic engineering extra-high arch dam measured data time-varying effect state space model convergence and divergence analysis

引用本文:

陈波1，2，吴诚姝1，2，刘庭赫1，2，3，顾冲时1，2. 特高拱坝长期运行时变效应的状态空间诊断方法[J]. 岩石力学与工程学报, 2023, 42(4): 868-878.
CHEN Bo1，2，WU Chengshu1，2，LIU Tinghe1，2，3，GU Chongshi1，2. State space diagnosis method for time-varying effect of extra-high arch dam in long-term operation. , 2023, 42(4): 868-878.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0744 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I4/868

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