Research On Settlement Monitoring Model Of High Core Wall Rockfill Dam During Construction Period

During the construction period,the high core rock-fill dam has environmental complexity and deformation uncertainty,and its monitoring data is represented by a series of short sequence data containing noise and large fluctuations.Due to the large deformation of the dam body during the construction period of the high core rock-fill dam,and the deformation is one of the most important observations that can directly and reliably reflect the dam's operation status,the analysis of the original observation data of deformation is in recent years at home and abroad.One of the main methods for studying the operational status of dams.In this paper,under the support of the National Natural Science Foundation “Numerical Analysis of Long-Term Deformation Characteristics of Concrete Dams and Safety Monitoring Methods”(NO.51769017),the “Construction of Safety Monitoring Model Construction of High Core Wall Rockfill Dams during Construction Period” was carried out.Through the analysis of the monitoring data of the high-wall rockfill dam during the construction period,considering the settlement deformation during the construction period is affected by many factors,adding the analysis of the residual,and using the mathematical and mechanical methods to construct the high-core rockfill dam during the construction period.Settlement monitoring model and multi-point measurement model,explore the evolution law of settlement of high core rockfill dam,and provide guidance and decision for the design and construction of high core rockfill dam.The main contents are as follows:(1)In view of the complex working conditions of the high core rockfill dam during construction period,this paper analyzes the monitoring data of high core wall rockfill dam during construction period,and analyzes the filling height,temperature,rainfall,dam and dam foundation.The influence characteristics of rock mass creep on dam settlement and deformation,and based on the measured data of settlement of high core rockfill dam during construction period,using grey theory and Markov chain theory to construct gray marble of high core wall rockfill dam during construction period The chain prediction model.(2)In order to further explore the characteristics of settlement and deformation of high core rockfill dam during construction period,the selection of dam settlement factor is studied,and the influence law of filling history on dam creep is discussed.Considering filling height,rainfall,dam and Based on the creep of dam foundation rock mass,based on Duncan-Chang model and rheological model theory,a nonlinear time-varying statistical model for settlement of high core rockfill dam during construction period is established.The ARIMA theory is used to further analyze and predict the residuals,and the residual prediction results are added to the conventional monitoring model that is not considered to improve the prediction effect of the model.(3)Considering that the traditional single point measurement model can not reflect the characteristics of settlement deformation of high core rockfill dam during construction period,based on BP neural network,a multi-point model of high core wall rockfill dam during construction period is constructed,which takes into account the monitoring instrument.The position information can better reflect the relationship between different measuring points.The calculation results show that the model has high fitting and prediction accuracy.