scholarly journals Deformation Analysis of an Ultra-High Arch Dam under Different Water Level Conditions Based on Optimized Dynamic Panel Clustering

2022 ◽  
Vol 12 (1) ◽  
pp. 481
Author(s):  
Yongtao Liu ◽  
Dongjian Zheng ◽  
Christos Georgakis ◽  
Thomas Kabel ◽  
Enhua Cao ◽  
...  
Keyword(s):  
Water Level ◽  
Constraint Satisfaction Problem ◽  
Water Levels ◽  
Arch Dam ◽  
Normal Operation ◽  
Deformation Analysis ◽  
Deformation Model ◽  
High Arch Dam ◽  
Deformation Law ◽  
Dam Deformation

During the operation period, the deformation of an ultra-high arch dam is affected by the large fluctuation of the reservoir water level. Under the dual coupling of the ultra-high dam and the complex water level conditions, the traditional variational analysis method cannot be sufficiently applied to its deformation analysis. The deformation analysis of the ultra-high arch dam, however, is very important in order to judge the dam safety state. To analyze the deformation law of different parts of an ultra-high arch dam, the panel data clustering theory is used to construct a Spatio-temporal characteristic model of dam deformation. In order to solve the difficult problem of the fluctuating displacement of dam deformation with water level effect, three displacement component indexes (absolute quantity, growing, and fluctuation) are proposed to characterize dam deformation. To further optimize the panel clustering deformation model, the objective weight coefficient of clustering comprehensive distance is calculated based on the CRITIC (CRiteria Importance Through Inter-criteria Correlation) method. The zoning rules of the ultra-high arch dam are established by using the idea of the CSP (Constraint Satisfaction Problem) index, and the complex water level of the reservoir is simulated in the whole process. Finally, the dynamic cluster analysis of dam deformation is realized. Through a case study, three typical working conditions including the rapid rise and fall of water level and the normal operation are calculated, and the deformation laws of different deformation zones are analyzed. The results show that the model can reasonably describe the deformation law of an ultra-high arch dam under different water levels, conveniently and intuitively select representative measuring points and key monitoring parts, effectively reducing the analysis workload of lots of measuring points, and improve the reliability of arch dam deformation analysis.

scholarly journals Static analysis of a high arch dam

2019 ◽  
pp. 45-57
Author(s):  
Yaser Ghafoori ◽  
Andrej Kryžanowski ◽  
Dejan Zupan
Keyword(s):  
Water Level ◽  
Static Analysis ◽  
Three Dimensional ◽  
Water Reservoir ◽  
Arch Dam ◽  
Three Dimensional Model ◽  
High Arch Dam ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Arch Dams

The paper presents the design and static analysis of a high arch dam. A feasibility study was conducted on the dam in the 90s and a preliminary layout was designed. However, the dam’s construction phase has been never started. In this paper, the design and layout of the dam under consideration are in accordance with the US manuals for the design of arch dams. The structure’s three-dimensional model was entered into the program SAP2000 and three-dimensional solid finite elements were used to discretize the model. This paper considers the hydrostatic pressure of the water reservoir and concrete self-weight. The analysis was performed for both the maximum and the minimum designed water level and for the case when the reservoir is empty. Special attention is given to the boundary conditions of the dam at its abutments and foundation. The results show that the planned layout is good for the dam’s construction. The arch dam’s curve transfers the loads to the abutments. The significant role of the foundation rigidity and the reservoir water level in the stress distribution and nodal displacements within the arch dam is observed.

Shallow unloading deformation analysis on Baihetan super-high arch dam foundation

2019 ◽  
Vol 78 (8) ◽  
pp. 5551-5568 ◽  
Author(s):  
Peng Lin ◽  
Jie Shi ◽  
Pengcheng Wei ◽  
Qixiang Fan ◽  
Zhilin Wang
Keyword(s):  
Arch Dam ◽  
Deformation Analysis ◽  
High Arch Dam ◽  
Dam Foundation ◽  
Unloading Deformation

Study of Dam Deformation Model Based on Neural Network

2012 ◽  
Vol 170-173 ◽  
pp. 2137-2142 ◽  
Author(s):  
Wu Sheng Hu ◽  
Fan Zhang ◽  
Lei Song ◽  
Hao Wang
Keyword(s):  
Neural Network ◽  
Statistical Model ◽  
Network Model ◽  
Neural Network Model ◽  
Bp Neural Network ◽  
Deformation Analysis ◽  
Deformation Model ◽  
Model Based ◽  
Dam Deformation ◽  
Bp Neural Network Model

Dam deformation analysis is one of the main tasks in dam safety monitoring. Regression analysis model is often used in dam deformation analysis in early days. At present, the statistical model, which divides the dam deformation into three parts, hydraulic pressure component, thermal component and ageing component, according to the causes of deformation, has been widely adopted in dam deformation analysis. The BP neural network model and the merging model based on BP neural network algorithm of dam deformation analysis are mainly discussed in this paper, and finally, the four models mentioned above are calculated and analyzed according to a specific project instance. The precisions are respectively ±1.19mm, ±0.38mm, ±0.34mm, and ±0.28mm for single linear regression model, statistical model, BP neural network model and merging model. So it is shown that the merging model is better than the others according to the results.

scholarly journals Threshold Definition for Monitoring Gapa Landslide under Large Variations in Reservoir Level Using GNSS

2021 ◽  
Vol 13 (24) ◽  
pp. 4977
Author(s):  
Shuangshuang Wu ◽  
Xinli Hu ◽  
Wenbo Zheng ◽  
Matteo Berti ◽  
Zhitian Qiao ◽  
...  
Keyword(s):  
Water Level ◽  
Early Warning ◽  
Early Warning System ◽  
Warning System ◽  
Early Warning Systems ◽  
Water Levels ◽  
Deformation Model ◽  
Warning Systems ◽  
Velocity Threshold ◽  
Landslide Deformation

The triggering threshold is one of the most important parameters for landslide early warning systems (EWSs) at the slope scale. In the present work, a velocity threshold is recommended for an early warning system of the Gapa landslide in Southwest China, which was reactivated by the impoundment of a large reservoir behind Jinping’s first dam. Based on GNSS monitoring data over the last five years, the velocity threshold is defined by a novel method, which is implemented by the forward and reverse double moving average of time series. As the landslide deformation is strongly related to the fluctuations in reservoir water levels, a crucial water level is also defined to reduce false warnings from the velocity threshold alone. In recognition of the importance of geological evolution, the evolution process of the Gapa landslide from topping to sliding is described in this study to help to understand its behavior and predict its potential trends. Moreover, based on the improved Saito’s three-stage deformation model, the warning level is set as “attention level”, because the current deformation stage of the landslide is considered to be between the initial and constant stages. At present, the early warning system mainly consists of six surface displacement monitoring sites and one water level observation site. If the daily recorded velocity in each monitoring site exceeds 4 mm/d and, meanwhile, the water level is below 1820 m above sea level (asl), a warning of likely landslide deformation accelerations will be released by relevant monitoring sites. The thresholds are always discretely exceeded on about 3% of annual monitoring days, and they are most frequently exceeded in June (especially in mid-June). The thresholds provide an efficient and effective way for judging accelerations of this landslide and are verified by the current application. The work presented provides critical insights into the development of early warning systems for reservoir-induced large-scale landslides.

Chang Law Analysis of the Horizontal Displacement of the Arch Crest Dam Section of the Geheyan Concrete Gravity Arch Dam

2012 ◽  
Vol 170-173 ◽  
pp. 2013-2016
Author(s):  
Bo Li ◽  
Li Li Liu ◽  
Da Zhi Li ◽  
Jun Liang
Keyword(s):  
Water Level ◽  
Horizontal Displacement ◽  
Measured Data ◽  
Arch Dam ◽  
Gravity Dam ◽  
Elastic State ◽  
Concrete Gravity Dam ◽  
Arch Dams ◽  
Deformation Law ◽  
General Deformation

Monitoring data of the arch crown dam section of the Geheyan concrete gravity arch dam were qualitatively and quantitatively analyzed. The analysis results show that the measured data and year changes of the dam horizontal displacement are small, the influence of the water level and temperature on the arch crown dam section is normal, the influence of the aging on the dam horizontal displacement is little, and the aging component has become stable. Therefore, it can be shown that the arch crown dam section of the Geheyan concrete gravity dam is in elastic state, and the horizontal displacement is accord with general deformation law of concrete arch dams.

High Arch Dam Reservoir Basin Deformation & Effect on Dam Operating Status

2014 ◽  
Vol 670-671 ◽  
pp. 651-654
Author(s):  
Er Feng Zhao ◽  
Yu Feng Jiang ◽  
Yan Ling Gu
Keyword(s):  
Influence Factors ◽  
Horizontal Displacement ◽  
Element Model ◽  
Water Levels ◽  
Arch Dam ◽  
Monitoring Data ◽  
High Arch Dam ◽  
Engineering Project ◽  
Reservoir Water ◽  
Reservoir Basin

With the development of 300m super-high dams are built in the southwest of China, reservoir water gravity will make the settlement of the reservoir basin, which will make dam tilt upstream. In the paper, reservoir settlement will be studied in-depth on the basis of monitoring data analysis and numerical simulation comprehensively. First, reservoir basin will be sinking with the rising of the upstream water gradually according to level monitoring data. Second, those affect factors of FEM calculation have been explored comparatively, such as displacement modes, element geometry and boundary conditions. Third, reservoir, dam and foundation are integrated into a whole to establish a wide spread finite element model. At last, reservoir deformation and its influence factors are determined through the simulation of the bedrock depth, the extending length of the upstream and downstream and different water levels. Those methods have been applied into an engineering project and analysis results show that the settlement of the reservoir will make high arch dam tilt upstream, the higher of the water level, the larger of the horizontal displacement. Accordingly, reservoir deformation should be considered deeply on the appraisement of super-high arch dam operating status in future.

Research on the Calculation of the Security of High Concrete Arch Dam Based on the Finite Element Method

2014 ◽  
Vol 1061-1062 ◽  
pp. 829-832
Author(s):  
Jia Long He ◽  
Yu Han Guo ◽  
Xi Zhu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Water Level ◽  
Arch Dam ◽  
The Finite Element Method ◽  
Concrete Arch Dam ◽  
Flood Level ◽  
Normal Water ◽  
Dam Deformation ◽  
Element Method

The study on the calculation of the security of high concrete arch dam based on the finite element method will be studied and analyzed in this paper. For high concrete arch dam deformation and stability under normal water level and maximum flood level will be calculated, and the stress of each section of the dam and batholith around will be checked and analyzed, then this paper will come to the dam security conclusion finally.

Failure Process Analysis of Arch Dam with Explicit FEM

2012 ◽  
Vol 170-173 ◽  
pp. 2043-2046
Author(s):  
Yu Xia ◽  
Xiao Lian Zhao ◽  
Da Wei Wang ◽  
Chong Qing Zhang
Keyword(s):  
Water Level ◽  
Irreversible Process ◽  
Process Analysis ◽  
Failure Process ◽  
Safety Evaluation ◽  
Local Deformation ◽  
Arch Dam ◽  
Normal Operation ◽  
The World ◽  
Rcc Arch Dam

Arch dam’s failure is a super nonlinear irreversible process. The research on process of it would give quite important information for safety evaluation. In this paper, it analyses overload of the highest RCC arch dam of the world with explicit FEM and shows the process of dam’s failure from normal operation, local deformation to overall failure by water-level overcharge method. It gives a more direct and precise safety factor. This method is also can be used in other structures.

Weight Analysis on Influencing Factors of Reservoir Basin Deformation

2013 ◽  
Vol 405-408 ◽  
pp. 617-620
Author(s):  
Er Feng Zhao ◽  
Li Bing Zhang
Keyword(s):  
Simulation Model ◽  
Influence Factor ◽  
Element Model ◽  
Entropy Method ◽  
Deformation Monitoring ◽  
Water Levels ◽  
Arch Dam ◽  
High Arch Dam ◽  
Arch Dams ◽  
Reservoir Basin

Reservoir basin deformation monitoring data of some high arch dams has shown that the upstream of the dam subsided while the downstream warped upward slightly. Therefore, combining reservoir basin with high arch dam and foundation, the widespread finite element model is built and the reservoir basin deformation and its influence factor weight are determined through the simulation of the bedrock depth, the extending length of the upstream and downstream and different water levels based on an improved entropy method. The engineering simulation model has proved the reservoir basin deformation mechanism. Moreover, the reservoir basin deformation will tend to converge when the simulation model expands to certain extent. The research can provide suggestions for deformation doubts occurring during the high arch dam operation.

Sign in / Sign up

Export Citation Format

Share Document