Study On The Safety Monitoring Model Of Concrete Dam Deformation Under The Change Of Reservoir Water Level

With the rapid development of dam-building technology in China,the theoretical analysis and method application of monitoring and control for concrete DAMS become more and more mature.Due to the complex environment of concrete dam,especially under the working condition of water level change,due to changes in water dry-wet alternate reduces the performance of dam concrete and led to the creep acceleration,therefore,consider water level change,analysis of concrete creep under the action of water pressure limitation and construction of concrete dam displacement monitoring model is of great significance.Supported by the National Natural Resources Foundation of China(NO.51769017)and the Spatio-temporal Analysis methods and Risk rates of Extra-high Arch DAMS(NO.51969018),this paper carried out the research on the safety Monitoring Model of concrete DAMS deformation with consideration of reservoir water level change.Considering the influence of reservoir water level change on creep of concrete dam,the influence factors of concrete dam deformation are explored,and the single measuring point monitoring model and temporal and spatial monitoring model of concrete dam displacement are constructed by comprehensive application of dam engineering knowledge,mechanics and mathematical methods.To explore the deformation behavior and law of concrete dam,and to provide theoretical and technical support for the normal operation of concrete dam.The details are as follows:(1)to explore the changes in water condition dam concrete creep evolution law,based on the elastic creep theory,studies the libraries water pressure change rate of water level fluctuation and synergy of deformation of concrete dam ageing,improved the limitation of traditional displacement statistic model component expression,constructed considering concrete dam displacement statistic model under water level changes.(2)Based on the displacement statistical model under the condition that the reservoir water level changes are taken into account,the residual time series is constructed.Considering the periodicity,randomness and trend of the residual series,the ARIMA model is used to modify the residual time series based on the difference autoregressed moving average(ARIMA)model,and the concrete dam deformation monitoring model based on the ARIMA model is constructed with consideration of the reservoir water level change.(3)in the construction of single station concrete dam displacement,on the basis of statistical model based on BP neural network,the displacement statistic model to isolate the hydraulic pressure component,temperature component and aging component and measuring point location information as input variables,measuringpoint measured displacement values as the output variable,consider to build the library based on BP neural network under water level changes of concrete dam deformation monitoring model of time and space.