scholarly journals Intelligent Anomaly Identification of Uplift Pressure Monitoring Data and Structural Diagnosis of Concrete Dam

2022 ◽  
Vol 12 (2) ◽  
pp. 612
Author(s):  
Chunhui Ma ◽  
Tianhao Zhao ◽  
Gaochao Li ◽  
Anan Zhang ◽  
Lin Cheng
Keyword(s):  
Finite Element ◽  
Spatial Clustering ◽  
Arch Dam ◽  
Monitoring Data ◽  
Western China ◽  
Pressure Monitoring ◽  
Concrete Dam ◽  
Dam Foundation ◽  
Uplift Pressure ◽  
Structural Diagnosis

As an essential load of the concrete dam, the abnormal change of uplift pressure directly threatens the safety and stability of the concrete dam. Therefore, it is of great significance to accurately and efficiently excavate the hidden information of the uplift pressure monitoring data to clarify the safety state of the concrete dam. Therefore, in this paper, density-based spatial clustering of applications with noise (DBSCAN) method is used to intelligently identify the abnormal occurrence point and abnormal stable stage in the monitoring data. Then, an application method of measured uplift pressure is put forward to accurately reflect the spatial distribution and abnormal position of uplift pressure in the dam foundation. It is easy to calculate and connect with the finite element method through self-written software. Finally, the measured uplift pressure is applied to the finite element model of the concrete dam. By comparing the structural behavior of the concrete dam under the design and measured uplift pressure, the influence of abnormal uplift pressure on the safety state of the concrete dam is clarified, which can guide the project operation. Taking a 98.5 m concrete arch dam in western China as an example, the above analysis ideas and calculation methods have been verified. The abnormal identification method and uplift pressure applying method can provide ideas and tools for the structural diagnosis of a concrete dam.

Application of Improved BP Neural Network Model in Uplift Pressure Monitoring

2011 ◽  
Vol 304 ◽  
pp. 24-30
Author(s):  
Yi Tao Mei ◽  
Dong Jian Zheng ◽  
Lei Xu
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Measured Data ◽  
Pressure Monitoring ◽  
Concrete Dam ◽  
Slow Convergence ◽  
Uplift Pressure ◽  
Monitoring Model ◽  
Actual Application ◽  
Bp Neural Network Model

The network structure, initial weights and initial thresholds were optimized to solve some problems, such as over-fitting and slow convergence rate in standard BP Neural Network. Combining the base seepage character of concrete dam, a uplift pressure monitoring model is established in this paper with measured data of a actual concrete dam . The advantage of the presented model is tested and validated by actual examples. It has positive significance in the actual application.

À priori uplift pressure model for concrete dam foundations based on piezometric monitoring data

2020 ◽  
pp. 1-12
Author(s):  
Renato Pereira ◽  
António Lopes Batista ◽  
Luís Canhoto Neves ◽  
João Martins Casaca
Keyword(s):  
A Priori ◽  
Monitoring Data ◽  
Concrete Dam ◽  
Uplift Pressure ◽  
Dam Foundations

Elastic foundation effects on arch dams

2017 ◽  
Vol 3 (2) ◽  
pp. 102 ◽  
Author(s):  
Muhammet Karabulut ◽  
Murat Emre Kartal ◽  
Omer Faruk Capar ◽  
Murat Cavusli
Keyword(s):  
Finite Element ◽  
Ground Motion ◽  
Elastic Foundation ◽  
Three Dimensional ◽  
Time History ◽  
Arch Dam ◽  
Numerical Analyses ◽  
Earthquake Response ◽  
Dam Foundation ◽  
Loma Prieta Earthquake

Earthquake response of an arch dam should be calculated under ground motion effects. This study presents three-dimensional linear earthquake response of an arch dam. Thereby, we considered different ground motion effects and also foundation conditions in the finite element analyses. For this purpose, the Type 3 double curvature arch dam was selected for application. All numerical analyses are carried out by SAP2000 program for empty reservoir cases. In the scope of this study, linear modal time-history analyses are performed using three dimensional finite element model of the arch dam and arch dam-foundation interaction systems. According to numerical analyses, maximum horizontal displacements and maximum normal stresses are presented by dam height in the largest section. These results are evaluated for rigid and various elastic foundation conditions. Furthermore, near-fault and far-field ground motion effects on the selected arch dam are taken into account by different accelerograms obtained from the Loma Prieta earthquake at various distances.

Reinforcement Analysis of Wanjiakouzi Arch Dam Using 3D Nonlinear Finite Element Method

2011 ◽  
Vol 255-260 ◽  
pp. 3472-3477
Author(s):  
Wei Wei ◽  
Qing Hui Jiang ◽  
Chi Yao ◽  
Tao Xie
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shear Bands ◽  
Nonlinear Finite Element ◽  
Arch Dam ◽  
Nonlinear Finite Element Method ◽  
Dam Foundation ◽  
Weak Rocks ◽  
The Stability ◽  
Element Method

Wanjiakouzi arch dam is constructed in a complex geological site, where a large number of faults, interlayer shear bands and karst zones exist in the dam foundation and abutments. The weak rocks have a bad effect on the stability of the arch dam. In this paper, the displacement distribution and stress field of the arch dam are analyzed using 3D nonlinear finite element method. The numerical results show that displacement between both left and right bank abutments is obviously asymmetric and there is greater compression and shear deformation along the faults under the thrust of the arch dam. Furthermore, the tensile stress at dam heel cannot meet the requirement of the design specifications. Therefore, it is necessary to reinforce the dam foundation and abutments to improve the ability to resist deformation of abutment. By taking such reinforcement measures as concrete plugs and consolidation grouting for weak zones, the asymmetric displacements between abutments are decreased significantly and the tensile stresses of dam heel meet the stability requirement.

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.

Crucial Geo-Qualities and Predominant Defects Treatment on Foundation Zones of Sino Mainland Xiluodu Arch Dam

2012 ◽  
Vol 446-449 ◽  
pp. 1997-2001 ◽  
Author(s):  
Ya Jun Wang ◽  
Yu Hu ◽  
Zheng Zuo ◽  
Lu Ping Zhi ◽  
Hua Xi Gao
Keyword(s):  
Quality Assessment ◽  
Management System ◽  
Geographical Location ◽  
Arch Dam ◽  
Western China ◽  
Dam Foundation ◽  
Safety Requirements ◽  
Blasting Excavation ◽  
Scientific Objects

Xiluodu arch dam of Xiluodu hydro-junction standing on Jinshajiang River is one of international super-hydropower-projects. Furthermore, this super arch dam lies in peculiarly complicated geographical location where the most dangerous geologies of Southern-western China live. So, the dam foundation condition must meet rigorous requirements on geological stability, mechanical-physical characters and permeability etc. Thereby, the key scientific objects include attitude of foundation surfaces, geological defects of main strata, blasting-excavation-substitution systematic construction for soft geo-layers. Based on practical survey on strata’s lithologic characters and geological structural traits from bank slopes as well as valley bed, researched comprehensively were the dam foundation weathering and unloading condition, the distribution of intra- and inter-formational disturbed belts, compressive belts and parental fissures. Particularly, discussed attentively was their quality assessment. The analyses results showed that the globally initial quality of dam foundation was super one and the local geological defects can be reinforced reliably by substitutive excavation in addition to intense consolidation grouting so as to meet constructive requirements of Xiluodu arch dam. The conclusion is the sophisticated process for blasting construction and comprehensively constructive management system is applicable. The blasting excavation produced smooth and completely split surfaces. The exposed strata’s blasting damage was controlled effectively. The geo-strata’s treatment met generally constructive safety requirements.

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