scholarly journals Application of Spatiotemporal Hybrid Model of Deformation in Safety Monitoring of High Arch Dams: A Case Study

2020 ◽  
Vol 17 (1) ◽  
pp. 319 ◽  
Author(s):  
Chongshi Gu ◽  
Xiao Fu ◽  
Chenfei Shao ◽  
Zhongwen Shi ◽  
Huaizhi Su
Keyword(s):  
Hybrid Model ◽  
Data Representation ◽  
Arch Dam ◽  
Deformation Analysis ◽  
Arch Dams ◽  
Dam Operation ◽  
Representation Method ◽  
The Relationship ◽  
Safety And Stability

As an important feature, deformation analysis is of great significance to ensure the safety and stability of arch dam operation. In this paper, Jinping-I arch dam with a height of 305 m, which is the highest dam in the world, is taken as the research object. The deformation data representation method is analyzed, and the processing method of deformation spatiotemporal data is discussed. A deformation hybrid model is established, in which the hydraulic component is calculated by the finite element method, and other components are still calculated by the statistical model method. Since the relationship among the measuring points is not taken into account and the overall situation cannot be fully reflected in the hybrid model, a spatiotemporal hybrid model is proposed. The measured values and coordinates of all the typical points with pendulums of the arch dam are included in one spatiotemporal hybrid model, which is feasible, convenient, and accurate. The model can predict the deformation of any position on the arch dam. This is of great significance for real-time monitoring of deformation and stability of Jinping-I arch dam and ensuring its operation safety.

scholarly journals The relationship between global plate motion and intra-plate deformation analysis of Cairo network: case study with simulated data

2015 ◽  
Vol 9 (1) ◽  
Author(s):  
Laszlo Banyai ◽  
Abdel-Monem Sayed Mohamed ◽  
Eszter Szűcs ◽  
Nadia Aboaly ◽  
Ashraf Mousa ◽  
...  
Keyword(s):  
Simulated Data ◽  
Plate Motion ◽  
Deformation Analysis ◽  
Plate Deformation ◽  
The Relationship

scholarly journals Advanced Nonlinear Dynamic Analysis of Arch Dams considering Joints Effects

2014 ◽  
Vol 6 ◽  
pp. 587263 ◽  
Author(s):  
Mohammad Amin Hesari ◽  
Mohsen Ghaemian ◽  
Abolfazl Shamsai
Keyword(s):  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Arch Dam ◽  
Dynamical Analysis ◽  
Dam Foundation ◽  
Arch Dams ◽  
Double Curvature ◽  
Reservoir Systems ◽  
Earthquake Performance

Influence of joints behavior on arch dams operation during the earthquakes is investigated. The case study is the Karun-1 double curvature arch dam with the height of 200 meters. The arch dam-foundation-reservoir systems are modeled with and without joints and estimate the effects of contraction and lift joints on stresses and displacements response histories for assessing the earthquake performance. According to nolinear dynamical analysis results, inclusion of the contraction and lift joints considerably influenced the dam response.

scholarly journals Investigation of Nonlinear Behavior of Concrete on Seismic Performance of an Arch Dam Using Finite Element Method

2016 ◽  
Vol 2 (6) ◽  
pp. 295-305
Author(s):  
Mortaza Ali Ghorbani ◽  
Majid Pasbani Khiavi ◽  
Parya Ahmadi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seismic Performance ◽  
Nonlinear Dynamic Analysis ◽  
Arch Dam ◽  
Nonlinear Behaviour ◽  
Concrete Dam ◽  
Arch Dams ◽  
Element Method

In this paper the effect of nonlinear behaviour of concrete is investigated on seismic performance of a double curvature concrete dam. The Morrow Point concrete dam has been selected as the case study and dam-reservoir-foundation interaction considered in the model. Finite element method has been used for modelling and analysis of case study by applying the El Centro earthquake components considering nonlinear behaviour of concrete. The obtained results of nonlinear dynamic analysis illustrate the increasing of displacement of dam crest along the river and decreasing of maximum principle stresses in critical points. The results demonstrate the importance of consideration of nonlinear behaviour of material in seismic performance of arch dams to achieve the optimal design of models.

scholarly journals Effects of Outlets on Cracking Risk and Integral Stability of Super-High Arch Dams

2014 ◽  
Vol 2014 ◽  
pp. 1-19 ◽  
Author(s):  
Peng Lin ◽  
Hongyuan Liu ◽  
Qingbin Li ◽  
Hang Hu
Keyword(s):  
Arch Dam ◽  
Loading Conditions ◽  
Nonlinear Fem ◽  
Normal Loading ◽  
Yield Zone ◽  
Arch Dams ◽  
Reinforcement Measures ◽  
Cracking Risk ◽  
Integral Stability

In this paper, case study on outlet cracking is first conducted for the Goupitan and Xiaowan arch dams. A nonlinear FEM method is then implemented to study effects of the outlets on integral stability of the Xiluodu arch dam under two loading conditions, i.e., normal loading and overloading conditions. On the basis of the case study and the numerical modelling, the outlet cracking mechanism, risk, and corresponding reinforcement measures are discussed. Furthermore, the numerical simulation reveals that (1) under the normal loading conditions, the optimal distribution of the outlets will contribute to the tensile stress release in the local zone of the dam stream surface and decrease the outlet cracking risk during the operation period. (2) Under the overloading conditions, the cracks initiate around the outlets, then propagate along the horizontal direction, and finally coalesce with those in adjacent outlets, where the yield zone of the dam has a shape of butterfly. Throughout this study, a dam outlet cracking risk control and reinforcement principle is proposed to optimize the outlet design, select the appropriate concrete material, strengthen the temperature control during construction period, design reasonable impounding scheme, and repair the cracks according to their classification.

Seismic analysis of high arch dams considering contraction-peripheral joints coupled effects

2013 ◽  
Vol 3 (3) ◽  
Author(s):  
Mohammad Hariri-Ardebili ◽  
Hasan Mirzabozorg ◽  
M. Kianoush
Keyword(s):  
Seismic Analysis ◽  
Safety Evaluation ◽  
Element Model ◽  
Water Levels ◽  
Arch Dam ◽  
Dam Reservoir ◽  
High Arch Dam ◽  
Arch Dams ◽  
Prone Area

AbstractDam-reservoir interaction is one of the classic coupled problems in which two various environments with different physical characteristics are in contact with each other on interface boundary. Consideration of such interaction is important in design of new dams as well as on safety evaluation of the existing ones. In the present study, the effect of hydrodynamic pressures at various reservoir operational levels on seismic behavior of an arch dam is investigated. Dez ultra-high arch dam in Iran was selected as case study and all contraction and peripheral joints were simulated using node-to-node contact elements which have the ability of opening/closing and tangential movement. In addition, stage construction effects including joint grouting based on available construction reports were considered. The reservoir was assumed to be compressible and the foundation rock was modeled to account for its flexibility. The TABAS earthquake record was used to excite the finite element model of dam-reservoir-foundation system. It was found that dam-reservoir interaction has significant structural effects on the system and generally, operating the considered arch dam at different water levels can highly affects the distribution of the crack prone area under the maximum credible earthquake.

Kämpfe um Bergbau und die Möglichkeiten demokratischer Transformation

2017 ◽  
Vol 47 (189) ◽  
Author(s):  
Kristina Dietz
Keyword(s):  
Direct Democracy ◽  
Social Power ◽  
Political Agenda ◽  
The Political ◽  
Liberal Democratic ◽  
Political Effects ◽  
Mining Project ◽  
National Governments ◽  
The Relationship

The article explores the political effects of popular consultations as a means of direct democracy in struggles over mining. Building on concepts from participatory and materialist democracy theory, it shows the transformative potentials of processes of direct democracy towards democratization and emancipation under, and beyond, capitalist and liberal democratic conditions. Empirically the analysis is based on a case study on the protests against the La Colosa gold mining project in Colombia. The analysis reveals that although processes of direct democracy in conflicts over mining cannot transform existing class inequalities and social power relations fundamentally, they can nevertheless alter elements thereof. These are for example the relationship between local and national governments, changes of the political agenda of mining and the opening of new spaces for political participation, where previously there were none. It is here where it’s emancipatory potential can be found.

Interactive acculturation of Turkish-Belgian parents and children in Flanders: A case study of Beringen

2019 ◽  
Vol 16 (3) ◽  
pp. 417-428
Author(s):  
Özgün Ünver ◽  
Ides Nicaise
Keyword(s):  
Early Childhood ◽  
Maternal Employment ◽  
Domain Specificity ◽  
Specific Context ◽  
Childhood Education ◽  
Parents And Children ◽  
Education And Care ◽  
The Relationship ◽  
The Town

This article tackles the relationship between Turkish-Belgian families with the Flemish society, within the specific context of their experiences with early childhood education and care (ECEC) system in Flanders. Our findings are based on a focus group with mothers in the town of Beringen. The intercultural dimension of the relationships between these families and ECEC services is discussed using the Interactive Acculturation Model (IAM). The acculturation patterns are discussed under three main headlines: language acquisition, social interaction and maternal employment. Within the context of IAM, our findings point to some degree of separationism of Turkish-Belgian families, while they perceive the Flemish majority to have an assimilationist attitude. This combination suggests a conflictual type of interaction. However, both parties also display some traits of integrationism, which points to the domain-specificity of interactive acculturation.

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